Patent Publication Number: US-11639552-B2

Title: Method for creating multiple electrical current pathways on a work piece

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of co-pending U.S. patent application Ser. No. 14/712,702, filed May 14, 2015, titled “Method for Creating Multiple Electrical Current Pathways on a Work Piece,” the entire content of which is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates generally to improved aesthetics for work pieces, including by a method of electroplating. More specifically, the present disclosure relates to a method for creating multiple electrical current pathways on a work piece to allow for the presence of multiple separate finishes on a single plastic work piece. 
     BACKGROUND OF THE DISCLOSURE 
     Plated decorative chrome finishes have long been available for various products in the automotive, appliance, consumer electronics, and household application industries. Variations in the deposition methods, processing conditions, and solution makeup of the various types of metals have subsequently resulted in aesthetic variations in the final product. These variations in processing, chemical, and deposition techniques are able to generate different color metal finishes, lower gloss levels, and less distinction of image (DOI) in the metal finish of work pieces all with an eye to improving aesthetics. Examples of these finishes include but are not limited to Bright Chrome, Black Nickel, Black Chrome, and the like. Another exemplary finish that has been employed is Satin Chrome, which involves varying the reflectivity of the underlying metal layer such as by creating more pits in the substrate surface. Varying the degree of reflectivity allows for many different types of metal finishes. Often, these variations are combined with a bright chromium finish in assemblies to 1) complement each other and 2) bring more aesthetic appeal to the final product. 
     A known method of finishing work pieces to provide a final product that has multiple distinct surface finishes includes utilizing work piece assemblies that are made up of multiple components, each having a different metal finish and which are assembled to form the final product. This practice, while effective, results in multiple operations and multiple sets of tooling which adds significant cost to the final product. 
     Another known method of finishing work pieces to provide a final product that has multiple distinct surface finishes includes applying bright and satin-like finishing to the surface of the work piece with masking and pre or post surface treatments using abrasive grains such as iron powder, glass powder, silicon oxide, alumina and the like. Molded in texture or surface effects have also been employed to create variation in the metal finish of the work piece by selectively incorporating the texture or surface finish into a portion of the work piece prior to application of a metal finish. However, when such work pieces, which include one section employing these surface effects and another part without these effects, are both subjected to electroplating, the leveling characteristic of the electroplated layer on these two sections does not create the visual effect of two distinct metal surface finishes as desired. Also, the pre and post surface treatments are costly and require an additional operation. 
     Vacuum metallization and chemical vapor deposition techniques are able to achieve a final product that has segments with different finishes, but are very costly and limited from a performance standpoint in many environments because of the thin layer of metal that results from these techniques. Additionally, physical vapor deposition coatings must include an organic coating thereover to protect the deposited metal layer. This additional step increases labor costs and creates an “orange peel” look due to the fact that the organic coating is not completely smooth. 
     Another method of creating two distinct surface effects on a work piece includes masking and painting using tinted basecoats and clear coats. Although this method creates the desired effect, it disadvantageously requires an additional painting operation which adds cost to the final product. 
     In view of the above, there remains a need for improved methods of treating work pieces that provide for a final product that includes more than one surface finish on a single work piece. More specifically, there remains a need for a method which offers more degrees of flexibility to designers and manufacturers with regards to its aesthetic effects while reducing the overall part and manufacturing costs by eliminating secondary operations. 
     SUMMARY OF THE DISCLOSURE 
     A method for plating a plastic work piece using a power source having a positive terminal and a negative terminal is provided. The method includes applying an electroless layer of material to the work piece using an electroless plating process. The positive terminal of the power source may be connected to a first anode and the negative terminal of the power source may be connected to the work piece. The work piece can then be immersed in a first aqueous solution that contains the first anode. The first anode may then be positively charged and the work piece may be negatively charged to cause metal ions in the first aqueous solution to be passed onto the electroless layer of the work piece. 
     The method can further include creating at least one barrier in electrical conductivity in the work piece prior to the step of immersing the work piece in a first aqueous solution to divide the work piece into at least a first segment and a second segment which are substantially electrically insulated from one another. 
     The negative terminal of the power source can also be connected to the second segment of the work piece. The method may also include immersing the work piece in a second aqueous solution that contains a second anode. Once the work piece is immersed in the second aqueous solution, the second anode can be positively charged and a second negative charge may be applied to the second segment of the work piece to cause metal ions from the second aqueous solution to be passed onto the electroless layer of only the second section of the work piece to form a second electroplated layer on the second segment of the work piece. 
     It is therefore an aspect of the present disclosure to provide a method for plating a work piece with multiple surface finishes. The method eliminates the need for costly secondary operations to finish the work piece since creating the barrier in electrical conductivity and respectively electroplating the first and second segments of the work piece may be done in an inexpensive and simple process. 
     In one aspect, a method of creating a part having multiple decorative surfaces is provided, comprising: forming a plastic work piece of a first material; creating at least one barrier in electrical conductivity in the work piece to divide the work piece into multiple electrically isolated segments including a first segment and a second segment; connecting a first segment of the work piece to a first circuit including a first power source; connecting a second segment of the work piece to a second circuit including a second power source; creating a first metal surface of the work piece on the first segment via a plating process; creating a second metal surface of the work piece on the second segment via a plating process; wherein the first and second metal surfaces of the work piece have different surface finishes; wherein the first and metal surfaces are created from the same base metal and a common solution. 
     In one aspect, the first metal surface includes multiple layers and the second metal surface includes multiple layers. 
     In a related aspect, the first and second metal surfaces each include multiple metal layers. 
     In one aspect, the method includes disposing the first and second segments in a common electroless solution prior to creating the first and second metal surfaces. 
     In one aspect, at least one layer of the first and second metal surfaces are created simultaneously from a common solution. 
     According to a related aspect, distinctive metal layers of the first and second metal surfaces are created simultaneously. 
     In one aspect, the first and second metal surfaces are created sequentially from a common solution. 
     In one aspect, the work piece remains in the common solution during the creation of the first and second metal surfaces. 
     In one aspect, where the first and second metal surfaces have common layers and the process includes a single rectifier that is used to create the common layers. 
     According to another aspect, the process involves dual rectifiers associated with each tank for the deposition of the metal layers. 
     In one aspect, the first power source produces a first type of surface finish and the second power source produces a second type of surface finish. 
     In one aspect, the method includes applying an electroless layer of material to the first and second segments of the work piece and rendering the first and second segments conductive. 
     In one aspect, the method includes creating a non-plateable barrier between the first and second segments of the work piece. 
     In another aspect, a method of creating a part having multiple decorative surfaces is provided, comprising: forming a plastic work piece; rendering a first segment and a second segment of the work piece conductive, wherein the first and second segments are electrically isolated relative to each other; creating a first metal surface on the first segment of the plastic work piece through a plating process that includes applying a first current via a first circuit that includes the first segment; creating a second metal surface on the second segment of the plastic work piece through a plating process that includes applying a second current via a second circuit that includes the second segment; wherein the first metal surface the second metal surface have the same base metal; wherein the first and second current are applied simultaneously to create at least one layer of the first and second metal surfaces simultaneously. The method additionally includes applying only the first current to form one or more additional metal layers on the first segment. The method can further include subsequently applying only the second current to form one or more additional metal layers on the second segment. 
     In one aspect, the first circuit includes a first power source and the second circuit includes a second power source. 
     In one aspect, the first metal surface is Bright Chrome and the second metal surface is different whereby the work piece has multiple different surface appearances. 
     In one aspect, the work piece and the first and second segments are disposed in a common solution during the creation of the first and second surfaces. 
     In one aspect, the first and second currents are different. 
     In one aspect, the first and second circuits are connected to different rectifiers. 
     In one aspect, the first metal surface includes multiple layers and the second metal surface includes multiple layers. 
     In one aspect, the method includes disposing the work piece and the first and second segments in a common solution having the base metal, wherein the first and second metal surfaces are created without removing the work piece from the common solution during the creation of the first and second metal surfaces. 
     In one aspect, the method includes forming at least one barrier in electrical conductivity in the work piece to divide the work piece into the first and second segments. 
     In one aspect, the at least one barrier is formed of a material that substantially prevents an electroless layer of material being formed thereon, and the step of rendering the first and second segments conductive includes applying an electroless layer of material on the first segment and the second segment. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Other aspects of the present disclosure will be readily appreciated, as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein: 
         FIG.  1    is flow diagram of a method of plating a work piece in accordance with an aspect of the disclosure; 
         FIG.  2    is a side cross-sectional view of a work piece having a barrier formed thereon in accordance with an aspect of the disclosure; 
         FIG.  3    is a side cross-sectional view of a work piece having a barrier formed thereon in accordance with another aspect of the disclosure; 
         FIG.  4    is a side cross-sectional view of a work piece having a barrier formed thereon in accordance with a further aspect of the disclosure; 
         FIG.  5    is a side cross-sectional view of a power source, a first aqueous solution, a first anode and a work piece in accordance with an aspect of the disclosure; 
         FIG.  6    is a side cross-sectional view of a power source, a second aqueous solution, a second anode and a work piece in accordance with an aspect of the disclosure; and 
         FIG.  7    is a schematic illustration of a plating tool for use in plating a work piece in accordance with an aspect of the disclosure. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to the Figures, wherein like numerals indicate corresponding parts throughout the several views, a method is generally shown for plating a work piece  100  using a power source  102  (e.g., a battery) having a positive terminal  104  and a negative terminal  106 . It will be appreciated that a variety of suitable power sources may be employed. According to an aspect, the work piece  100  may be configured as a trim component for a vehicle such as a grill, wheel cover or interior trip piece. It will be appreciated that the work piece  100  may be for a variety of different applications, including for furniture applications. 
     According to an aspect, as exemplarily shown in  FIGS.  1 - 4   , the method includes creating a barrier  114  to electrical conductivity in a base substrate layer  110  of the work piece  100 . Thereafter, an electroless layer of material  108  can be applied to the base substrate layer  110  of the work piece  100  using an electroless plating process, as generally indicated by reference number  10 . As known in the art, the electroless plating process generally includes an autocatalytic chemical reaction which causes a metal to be deposited on the base substrate layer  110  of the work piece  100  such that the substrate layer  110  will be conductive. According to an aspect, the electroless layer of material  108  can act as a base layer that has good adherence to both the substrate layer  110  of the work piece  100  as well as to a subsequently plated electroplated layer  124 ,  132 , as described illustratively below. Therefore, once the electroless layer of material  108  is adhered to the base substrate layer  110  of the work piece  100 , the work piece  100  may be well-suited for receiving subsequent electroplated layers thereon. It should be appreciated that suitable metals for plating (both electroless plating and electroplating) according to the subject method may include, but are not limited to, copper, nickel, zinc, palladium, gold, cobalt, chromium (i.e., chrome), and alloys thereof. Furthermore, the material of the substrate layer  110  of the work piece  100  in accordance with an aspect may be plastic, but other suitable materials for both the metal layers and the substrate could be used without departing from the scope of the subject disclosure. According to another aspect, a non-conductive base substrate layer  110 , such as a non-conductive plastic, may be rendered conductive in a variety of other suitable ways. For example, the work piece  100  may include or be formed of a conductive plastic. It will be appreciated that the base substrate and/or the work piece may be formed via an injection molding process. According to a further aspect, a conductive paint may be applied over the base substrate layer  110  such that the part is suitable for receiving subsequent electroplated layers thereon. 
     According to an aspect, the method can also include creating a barrier  114 ,  214 ,  314  in electrical conductivity in the work piece  100  to divide the work piece  100  into a first segment  116  and a second segment  118 , with the first and second segments  116 ,  118  substantially electrically insulated from one another, as generally indicated by reference number  12 . As a result, a current may flow through each respective first and second segment  116 ,  118  without flowing through the other. 
     According to an aspect and as exemplarily shown in  FIG.  2   , a barrier  114  in electrical conductivity in the work piece  100  may be created, formed or disposed on the base substrate layer  110  prior to application of the electroless layer of material  108  to the work piece  100 . According to an aspect, the step of creating a barrier  114  in the work piece  100  may include applying a plating resistant coating on the work piece to define the barrier  114  so as to substantially prevent the subsequent deposition of the electroless layer of material  108  on the barrier  114 . The plating resist coating  114  may include a non-plateable plastic resin that may be applied to the surface. The plating resist coating may be a polyvinyl chloride material, a polycarbonate material or the like that is applied to the substrate, such as by painting. It will be appreciated that this material should substantially prevent the electroless layer of material  108  from being formed on areas of the base substrate layer  110  that are insulated from the area to which current is applied. It will also be appreciated that a variety of other suitable materials which resist plating may be employed. Such a material may vary depending on what kind of metal is being applied thereon by way of the electroless plating process. It should be appreciated that since the area of the barrier  114  is unable to receive the electroless layer of material  108 , after the electroless layer of material  108  is applied on the remaining portions of the work piece  100 , the first and second segments  116 ,  118  of the work piece  100  may each be configured as respective electrical circuits that are isolated from the other. As shown in  FIG.  2   , according to an aspect, the barrier  114  may be formed on both a front surface  140  and a back surface  142  of the work piece  100  to ensure that they are electrically isolated from one another so long as current between the sections is isolated. While the barrier  114 ′ is illustrated as disposed opposite the barrier  114 , it will be appreciated that they can be offset. 
     According to another aspect as exemplarily shown in  FIG.  3   , a barrier  214  in electrical conductivity in the work piece  100  may be created, formed or disposed on the base substrate layer  110  prior to application of an electroless layer of material  108  to the work piece  100 . According to a further aspect, the step of creating a barrier  214  in the work piece  100  may include molding a non-plateable material  214  into or onto the work piece  100  to define the barrier  214  so as to substantially prevent the deposition of the electroless layer of material  108  on the barrier  214 . Like the plating resistant coating  114 , the non-plateable material  214  may include a non-plateable plastic resin including, but not limited to, a polyvinyl chloride material, a polycarbonate material or the like. Again, this material should substantially prevent the electroless layer of metal from being formed thereon. According to this aspect, the molding process for creating this layer may include a multi-shot injection molding process, a transfer molding process, an over-molding process or the like. It will be appreciated that a variety of other suitable molding processes may be employed. Again, it should be appreciated that since the area of the barrier  214  is unable to receive the electroless layer of material  108 , after the electroless layer of material  108  is applied on the remaining portions of the work piece  100 , the first and second segments  116 ,  118  of the work piece  100  may each function as respective electrical circuits that are isolated from one another. As shown in  FIG.  3   , according to an aspect, the barrier  214  may be formed on both a front surface  140  and a back surface  142  of the work piece  100  to ensure that they are electrically isolated from one another. While the barrier  214 ′ is illustrated as disposed opposite the barrier  214 , it will be appreciated that they can be offset so long as current between the sections is isolated. Additionally, as shown, the barrier  214 ′ may be larger in size and take up more of the back side  142  surface. 
     According to a further aspect as exemplarily shown in  FIG.  4   , the step of creating a barrier  314  in electrical conductivity in the work piece  100  can alternately occur after the electroless layer of material  108  has been applied, and may include removing a portion of the electroless layer of material  108  to define the barrier  314  in electrical conductivity. When the electroless layer of material  108  is removed to create the barrier  314  subsequent electroplated layers will not deposit due to the non-conducting surface under the electroless layer, making the first and second segments  114 ,  116  of the work piece  100  function as respective, isolated, electrical circuits. The barrier segment of the electroless layer of material  108  may be removed by a mechanical mechanism, chemical dissolution or the like. It will be appreciated that a variety of other suitable removing process may be employed. As shown in  FIG.  4   , according to an aspect, the barrier  314  may be formed on both a front surface  140  and a back surface  142  of the work piece  100  to ensure that they are electrically isolated from one another. While the barrier  314 ′ is illustrated as disposed opposite the barrier  314 , it will be appreciated that they can be offset so long as current between the sections isolated. 
     It should be appreciated that any combination of the aforementioned methods may be used to create the barrier  314  in electrical conductivity. According to an aspect, the barrier  314  on the front surface can be formed utilizing one method and the barrier  314 ′ on the back surface can be formed utilizing another method. For example, the barrier  314  on the front surface can be formed via an injection molding method utilizing a material that is resistant to plating and the barrier  314 ′ on the back surface can be formed utilizing a spray resist coating. It will be appreciated that a variety of other suitable ways may be employed to create barriers to electrical conductivity. 
     According to an aspect, as shown  FIGS.  1  and  5   , the method may proceed with the step of connecting the positive terminal  104  of the power source  102  to a first anode  120 , as generally indicated by reference number  14 . The first anode  120  may be made of a metal material and may be placed in a first aqueous solution  122  with current being applied to the first anode  120 . The first anode  120  may be soluble, where the material will dissolve into a first aqueous solution  122  as current is passed through it or insoluble, where the anode material will not dissolve into the solution as current is applied therethrough. It will be appreciated that the first anode  120  could be constructed of a metal material, which may include, but is not limited to, copper, nickel, zinc, palladium, gold, cobalt, chromium (i.e., chrome), and alloys thereof. According to an aspect, the metal material from the first anode  120  may be used directly for plating purposes on the work piece  100 . Alternatively, the plating to the work piece  100  can occur from the metal ions available in the first aqueous solution  122 , as will be understood by one of ordinary skill in the art. The first anode  120  may be in the form of a solid mass of material that is insoluble or soluble, while the plating solution is composed of a plurality of metal salts necessary to achieve the desired plated layer. 
     According to aspect, the method proceeds with connecting the negative terminal  106  of the power source  102  to a first point of contact  123  on the first segment  116  of the work piece  100 , as generally indicated by reference number  16 . The work piece  100  may then be immersed in the first aqueous plating solution  122  which may contain metal salts and the first anode  120 , as generally indicated by reference number  20 . After the work piece  100  has been immersed in the first aqueous solution  122 , the method can proceed with  20  positively charging the first anode  120  and negatively charging the first segment  116  of the work piece  100  to cause the metal ions in the first aqueous solution  122 , to be reduced to their metallic state at the solution interface of the first segment  116 . A layer of metal may then form on the first segment  116  because it is the only location on the work piece  100  that has a supply of electrons to reduce the metal salts to their respective metal state (i.e., Cu 2+ +2e→Cu 0 ). Because there is no supply of electrons on the second segment  118  (since it is electrically isolated), metal ions in the first aqueous solution  122  cannot be reduced to their metallic state. 
     According to another aspect, as shown in  FIGS.  1  and  6   , the method can then continue with the step of removing the work piece  100  from the first aqueous solution  122  and connecting the positive terminal  104  of the power source  102  to a second anode  126 , as generally indicated by reference number  22 . Similar to the first anode  120 , the second anode  126  may be made of a metal material Also, like the first anode  120 , the metal material from which the second anode  126  can be comprised may include, but is not limited to, nickel, zinc, palladium, gold, cobalt, chromium (i.e., chrome), and alloys thereof. It will be appreciated that a variety of other suitable materials may also be employed. According to an aspect, the second anode  126  may be of a different metal than the metal of the first anode  120 . Also like the first anode  120 , the second anode  126  may be in the form of a solid mass of material that is insoluble or soluble, while the plating solution is composed of a plurality of metal salts necessary to achieve the desired plated layer  128 . It will be appreciated that different metal finishes can also be achieved utilizing the same anodes such as for example with a Bright Chrome part and a Satin Chrome part. 
     According to a further aspect, the method can then proceed with connecting the negative terminal  106  of the power source  102  to a second point of contact  130  on the second segment  118  of the work piece  100 , as generally indicated by reference number  24 . The work piece  100  may then be immersed in the second aqueous solution  128  which contains the second anode  126 , as generally indicated by reference number  25 . After the work piece  100  has been immersed in the second aqueous solution  128 , the method can continue with positively charging the second anode  126  and negatively charging the second segment  118  of the work piece  100  to cause metal ions from the second plating solution  126  to be passed onto the electroless layer  108  on the second segment  118  of the work piece  100  to form a second electroplated layer  132  on the second segment  118 , as generally indicated by reference number  26 . It should be appreciated that a metal layer only forms on the second segment  118  of the work piece  100  because the first and second segments  116 ,  118  are electrically insulated from one another by the barrier  114 ,  214 ,  314 . 
     As a result of the aforementioned steps, after the second electroplated layer  132  of metal has been formed on the second segment  118  of the work piece  100 , the first and second segments  116 ,  118  have different metallic finishes. It should further be appreciated that additional barriers  114 ,  214 ,  314  in conductivity could be made on the work piece  100  to provide additional segments that are electrically insulated from one another. Such additional segments could be electroplated in accordance with the aforementioned steps to provide for more than two segments of the work piece  100  that have different metallic finishes. 
     According to a still further aspect, to improve adherence of the first and second electroplated layers  124 ,  132  to the work piece  100  and to improve the structural properties of the work piece  100 , an intermediate electrolytic layer of copper from an acid copper plating solution may be applied to both the first and second segments  116 ,  118  after the electroless layer of material  108  is applied to the work piece  100 , and prior to electroplating the first and second electroplated layers  124 ,  132  as described above. Applying this intermediate layer can build the metal thickness to a level that is sufficient to carry the current for electroplating of subsequent metal layers. After the intermediate copper layer has been electrodeposited to a sufficient thickness, an intermediate layer of sulfur-free nickel may be electroplated onto the copper surface to protect the copper from corrosion on all electrical pathways on the part. After the deposition of the intermediate layer of sulfur-free nickel is electroplated on the work piece, there can be a significant amount of metal to carry current, and the copper layer is protected. Therefore, the work piece  100  can be immersed in any suitable plating solution and electroplated as described above to provide the first and second electroplated layers  124 ,  132  to achieve the desired finishing effect. It should be appreciated that the method could alternatively proceed without these steps and other materials could be used in these steps in place of those described. It will additionally be appreciated that intermediate layers consisting of different materials could be applied to the first and second segments  116 ,  118  to provide different appearances for the work piece  100 . 
     According to a further aspect of the present disclosure, after a barrier  114 ,  214 ,  314  is created as described above to electrically isolate multiple sections of a work piece  100 , an electrophoretic coating may be selectively deposited on at least one of the sections of the work piece  100  in order to create different aesthetic affects. It will be appreciated that the deposition of the electrophoretic coating may occur in connection with the deposition of one or more different metal layers as discussed above. It will be appreciated that different electrophoretic coatings may be selectively deposited in the same fashion discussed above such that one electrophoretic coating may be applied to one section of a part without it being applied to another section of the part. 
     According to a still further aspect of the present disclosure, as the barriers can be formed on both the front side  140  and the back side  142  of the work piece  100 , metal layers are not deposited thereon, as discussed above. As shown in the Figures, a light source  150 ,  250 ,  350  may be disposed behind the work piece  100  and positioned to emit light into the barriers to provide a backlighting effect, as shown, to enhance aesthetics. It will be appreciated that the use of a transparent or translucent material at the barrier can assist with this effect, although non-translucent or non-transparent materials may also be employed. Alternatively, the work piece  100  may be formed of resins of different colors to provide additional aesthetic affects. 
       FIG.  7    illustrates a plating tool  400  in accordance with an aspect of the disclosure. As shown, the tool  400  can include a plating rack  402  with a plurality of rack tabs  404 , which are configured to hold individual work pieces that are to be subjected to a plating process. According to an aspect, the plating tool  400  can include multiple current pathways, which may be referred to as a first circuit  406  and a second circuit  408 . Each of the first circuit  406  and the second circuit  408  can be selectively actuated such that each of the circuits can be active at separate times as desired. According to another aspect, the first circuit  406  can be configured such that it is in communication with a first segment  116  of the work pieces  100  located on the rack tabs  404  of the plating rack  402  such that current is applied thereto to effectuate plating a metal layer onto the first segment  116 . This allows for first segments of multiple work pieces to be subjected to a plating process simultaneously. According to a further aspect, the second circuit  408  can be configured such that it is in communication with a second segment  118  of the work pieces  100  located on the rack tabs  404  of the plating rack  402  such that current is applied thereto to effectuate plating of a separate metal layer onto the second segment  118 . This allows for second segments of multiple work pieces to be subjected to a plating process simultaneously. It will be appreciated to more than two circuits can be integrated into the plating rack  402  to accommodate plating multiple different metal layers onto a surface of the work piece  100 . 
     According to an aspect, the first circuit  406  can include a first power source  410 , a first cathode  412  and a first connector bushing  414 . The first power source  410  can provide power to the first cathode  412  to charge at least a portion of one or more work pieces. The first power source  410  may be in communication with the first cathode  412  via the first connector bushing  414 . According to a further aspect, the first cathode  412  may be integrated into the plating rack  402 . According to a still further aspect, the second circuit  408  can include a second power source  416 , a second cathode  418 , and a second connector bushing  420 . The second power source  416  can provide power to the second cathode  418  to charge at least a portion of one or more work pieces. The second power source  416  may be in communication with the second cathode  418  via the second connector bushing  420 . The second cathode  418  may also be integrated into the plating rack  402 . 
     According to an aspect, each of the circuits  406 ,  408  may be electrically insulated from each other. Additionally, each of the circuits  406 ,  408  can connect to separate power sources such that each of the circuits can be activated individually or simultaneously as desired. The use of separate circuits allows for the plating of different metals on a single work piece. According to a further aspect, the plating rack  402  may be coated with a plate resistant coating to prevent rack plate-up as well as rack damage. The plate resistant coating may be Platisol, however, a variety of other suitable coatings may be employed. 
     It will also be appreciated that an auxiliary anode may also be incorporated into the tooling to assist in the deposition of metal in areas where the electrical current density is limited, such as recessed areas. 
     As described above, the work piece  100  may have separate segments  116  and  118  that are electrically isolated relative to each other. In one aspect, multiple layers of material may be applied via an electroplating process. These multiple layers of material may be applied to one of the segments  116  or  118 . For example, multiple layers of material may be applied to the first segment  116 . Additionally, multiple layers of material may be applied to the second segment  118 . The segments  116  and  118  may be plated separately, by removing the work piece  100  from the first aqueous solution  122  and then placing the work piece  100  in the second aqueous solution  128 . In another aspect, the work piece  100  may remain immersed in the first aqueous solution  122 , and the first segment  116  may be plated by running a current through the first circuit  406  at a first time, and then the second segment may be plated by running a current through the second circuit  408  at a second time without removing the work piece  100  from the first aqueous solution  122 . It will be appreciated that the first aqueous solution  122  is used for both segments  116 ,  118 , and the first aqueous solution  122  is not limited for use with the first segment  116 . 
     The above description has referred to a first circuit  406  and a second circuit  408 . However, it will be appreciated that there may be more than two separate circuits, and that the use of multiple circuits is not limited to two. 
     In one aspect, multiple separate circuits may be attached to the first segment  116 , to allow for plating multiple layers of material on the first segment  116  using multiple rectification sources. In one aspect, a first layer of a first metal material may be applied to the first segment  116  via a first circuit via a first rectification source, and a second layer of a second metal material may be applied to the first segment  116  via a second circuit via a second rectification source. 
     In one aspect, the plating process can include applying a first current via a first circuit that includes the first segment  116 , and the plating process further includes applying a second current via a second circuit that includes the second segment  118 . The plating process may include creating a first metal surface on the first segment  116  that includes a plurality of first metal layers. The plating process may include creating a second metal surface on the second segment  118  that includes a plurality of second metal layers. 
     In one aspect, the first current and the second current are applied simultaneously to the first and second metal surfaces such that at least one of the first metal layers and at least one of the second metal layers are deposited on the work piece  100  at the same time. In one aspect, the work piece  100  remains within the same aqueous solution as the first and second currents are applied. 
     In one aspect, the first circuit  406  is connected to the first power source  410 , and the second circuit  408  is connected to the second power source  416 . The first and second power sources  410 ,  416  may be activated simultaneously, as described above. When activated simultaneously, common metal layers may be applied to the first segment  116  and second segment  118  at the same time. The first and second power sources  410 ,  416  may also be activated individually. When activated individually, metal layers may be applied to the first segment  116  and second segment  118  at different times such as sequentially. 
     In one aspect, the first segment  116  may be part of a circuit that includes the first power source  410  and may also be part of a circuit that includes the second power source  416 . Accordingly, when the first power source  410  is activated, a first metal layer of a first type may be applied to the first segment  116 , and when the second power source  416  is activated, a second metal layer of a second type may be applied to the first segment  116 . Similarly, the second segment  118  may be part of a circuit with both the first power source  410  and the second power source  416 . 
     The use of separate power sources and separate rectifiers therefore allows for different types of metal layers to be applied easily and efficiently without requiring removal of the work piece  100  from the solution in which it is disposed. The work piece  100  need not be removed and placed in a different solution and connected to a different circuit. The segments  116  and/or  118  may be attached to multiple circuits, and selective activation of the rectifiers may be used to control which segment is plated and/or which type of surface finish is applied, depending on the circuit that activated. 
     As stated above, different metal finishes may be achieved utilizing the same anodes. For example, a bright chrome finish may be achieved using the same anode that produces a satin chrome finish by utilizing different rectifiers and different circuits. 
     Thus, in one aspect, the first and second metal surfaces created on the work piece  100  have the same base metal. The base metal may be disposed in the first aqueous solution  122  in which the work piece  100  is disposed. The first metal surface may be bright chrome, and the second metal surface may be a different metal surface having the same base metal as bright chrome (e.g. satin chrome). 
     The first segment  116  may be part of a first circuit that includes the first power source  410 , and the second segment  118  may be part of a second circuit that includes the second power source  416 . The work piece  100  and both the first segment  116  and the second segment  118  may be disposed in the first aqueous solution  122  that includes the same base metal for creating a bright chrome and/or satin chrome and/or other finish arising from the same base metal. The first and second power sources  410  and  416  may be activated simultaneously, sequentially, or during an overlapping period of time. The first segment  116 , being electrically isolated from the second segment  118 , will receive one type of surface finish according to the first power source  410 . The second segment  118 , being electrically isolated from the first segment  116 , will receive a different type of surface finish according to the second power source  416 . These different surface finishes may be achieved without removing the work piece  100  from the first aqueous solution  122 . 
     In one aspect the first segment  116  may be part of a first circuit that includes the first power source  410 . The first segment  116  may also be part of a second circuit that includes the second power source  416 . The work piece  100  maybe disposed in the first aqueous solution  122  that includes the same base metal. The first circuit may be activated to produce a first type of metal layer on the first segment  116  from the base metal of the solution  122 . The second circuit may then be activated to produce a second type of metal layer on the first segment  116  from the base metal of the solution  122 . 
     Obviously, many modifications and variations of the present disclosure are possible in light of the above teachings and may be practiced otherwise than as specifically described while within the scope of the appended claims. These antecedent recitations should be interpreted to cover any combination in which the inventive novelty exercises its utility. The use of the word “said” in the apparatus claims refers to an antecedent that is a positive recitation meant to be included in the coverage of the claims whereas the word “the” precedes a word not meant to be included in the coverage of the claims.