Patent ID: 6099711
Filing Date: 2000-08-08
Classification: C25D,H05K,Y10S

Abstract:
Method for the electrolytic deposition of fine crystalline metal coatings with uniform distribution of layer thicknesses and uniform brightness, high fracture elongation and tensile strength even in places of high current density, by means of a pulse current method comprising a duration of cathodic, or cathodic and anodic, pulses of current or voltage, comprising the steps of:a) applying the pulse current on workpieces polarized as cathodes andb) using inert, dimensionally-stable insoluble anodes coated with noble metals or oxides of noble metalsc) from a deposition solution containingc1) ions of the metal to be deposited,c2) additive compounds for controlling the brightness, the fracture elongation and the tensile strength, andc3) compounds of at least one electrochemically reversible redox system, by means of the oxidised form of which the ions of the metal to be deposited are formed by at least partial dissolution of pieces of said metal.