LN ELECTRO PLATING CHROMIUM ALLOYS
Year: 1884

page_text: I THOMAS SLATER of 98 Lancaster Road Bayswater in the County of Middlesex
Electrician do hereby declare the nature of my invention for IMPROVEMENTS LN
ELECTRO PLATING CHROMIUM ALLOYS to be as follows:-
The object of the invention is to effect the electro plating of Chromium Alloys.
For this purpose I employ such electrolytes as are well known and usually
employed for plating or depositing brass, tin, copper, gold or silver, in electro
plating chromium alloys upon other metallic surfaces.
The chromium alloys may be obtained in the manner hereinafter mentioned.
These chromium alloys I proceed to deposit, by the aid of the electric current and
using such electrolytes as I select from the class indicated upon the metallic surface
to be electro plated. Then in order to produce upon articles thus electro plated
with chromium alloys a surface of plating of a bright golden color I submit those
chromium alloy plated articles to another bath of the following components namely
chloride of Tin
Chloride of Tin
Chloride of Copper
Bichiomate of Ammonia
Chloride of Platinum
Cyanide of Potassium
Water
-
8 parts
25
6 to
20
J
10
15
"
"
6
12
"
"
25
30
"
"
101 110
33
"
with the aid of an electric current of moderate intensity, or force.
The employment of the last mentioned electric bath produces upon the deposit of
chromium alloy previously deposited as described a further deposit or finished
effect of a very beautiful golden yellow color and at the same time the durability
of the deposit of chromium alloy is greatly enhanced.
The chromium alloy anodes employed may be obtained by subjecting chromate
of potash, or other salt, or salts of chromium, or chromic acid with about an equal
weight of charcoal in coarse grains to heat in a covered crucible until softened, and
then pouring thereon copper in quantity, in a molten state about two and a half
times the weight of the contained mass from another crucible and further adding
molten tin from another crucible, in quantity about one half to two parts and
I cause all these ingredients to be well admixed by prolonging the heating, aided
by frequent stirring and the mass having become suitably fluid it is poured into

page_text: water for the purpose of suitably dividing disintegrating or reducing to the
granular or reduced state, well known and practised in the reduction of other
metals and then remelting the combined matters with the aid of a flux composed of
1 part of biborate of Soda
2 parts of nitrate of potash, and
2 parts of Carbonate of potash and
the alloy formed is suitably formed or shaped by casting in a mould or otherwise
to form suitable plates or other shapes of anodes aided by rolling.
A modified color of the chromium alloy is obtained by the addition of 1 part of
metallic nickel and from three to four parts of metallic tin mixed with about the 1
same proportionate quantity of metallic copper to chromium salts or oxides such as
used in the previous instance.
An electrolyte for use in plating chromium alloys according to my invention
which I have found available with good and useful results is prepared by dissolving
one pound of Cyanide of potassium and one pound of carbonate of ammonium in 1
one gallon of water and then heating the solution to about 150° Fahrenheit and
I immerse the anode and pass a strong current of electricity through the same until
enough of the metal is dissolved and when a good reguline deposit is obtained on
the cathode plate the solution is ready for work.
The strength of the electric current employed in the bath for the finishing or
treatment of the chromium alloys after their first deposit, may be of a most
moderato character-say for instance even one half a volt for some purposes will
be ample but dependent for such strength on the color desired; the strength of
the solution; the temperaturo and other circumstances.
The proportions of the components of this electrolytic or finishing or after
treating solution may be considerably varied dependent a great deal on the color
or shade of color desired to be developed.

page_text: I THOMAS SLATER of 98 Lancaster Road Bayswater in the County of Middlesex
Electrician do hereby declare the nature of my invention for IMPROVEMENTS IN
ELECTRO PLATING CHROMIUM ALLOYS and in what manner the same is to bo
performed, to be particularly described and ascertained in and by the following
statement:-
The object of the invention is to effect the electro plating of Chromium alloys.
For this purpose I employ such electrolytes as are well known and usually
employed for plating or depositing brass, tin, copper, gold or silver, in electro
plating Chromium alloys upon other metallic surfaces.
The chromium alloys may be obtained in the manner hereinafter mentioned.
These chromium alloys I proceed to deposit by the aid of the electric current and
using such electrolytes as I select from the class indicated, upon the metallic
surface to be electro plated. Then in order to produce upon articles thus clé ro
plated with chromium alloys a surface of plating of a bright golden color I submit
those chromium alloy plated articles to another bath of the following components
naincly
Chloride of Tin
Chloride of Copper
Bichromate of Ammonia
Chloride of Platinum
Cyanide of Potassium
Water
-
G to
20 to 25
8 parts
"
10 to 15
6 to
25 to 30
"
12
"
33
"1
101 110
"
with the aid of an electric current of moderate intensity or force.
The employment of the last mentioned electric bath produces upon the deposit of
chromium alloy previously deposited as described a further deposit or finished effect.
of a very beautiful golden yellow color and at the same time the durability of the
deposit of chromium alloy is greatly enhanced.
The chromium alloy anodes employed may be obtained by subjecting chromate
of potash, or other salt or salts, of chromium, or chromic acid with about an equal
weight of charcoal in coarse grains to heat in a covered crucible until softened, and
then pouring thereon copper in quantity in a molten state about two and a half
times the weight of the contained mass, from another crucible and further adding
molten tin from another crucible, in quantity about one half to two parts and
I cause all these ingredients to be well admixed by prolonging the heating, aided
by frequent stirring and, the mass having become suitably fluid, it is poured into
water for the purpose of suitably dividing disintegrating or reducing to the
granular or reduced state, well known and practised in the reduction of other
metals and then remelting the combined matters with the aid of a flux com-
pound of
1 part of biborate of soda
2 parts of nitrate of potash and
2 parts of carbonate of potash, and
the alloy formed is suitably formed or shaped by casting in a mould, or otherwise,
to form suitable plates, or other shapes, of anodes aided by rolling.
A modified color of the chromium alloy is obtained by the addition of 1 part of
metallic nickel and from three to four parts of metallic tin, mixed with about the
same proportionate quantity of metallic copper to chromium salts, or oxides, such
as used in the previous instance.

page_text: An electrolyte for use in plating chromium alloys according to my invention
which I have found available with good and useful results is prepared by dissolving
one pound of cyanide of potassium and one pound of carbonate of ammonium in
one gallon of water and then heating the solution to about 150° Fahrenheit and
I immerse the anode and pass a strong current of electricity through the same until
enough of the metal is dissolved and when a good reguline deposit is obtained on
the cathode plate the solution is ready for work.
The strength of the electric current employed in the bath for the finishing or
treatment of the chromium alloys after their first deposit, may be of a most
moderate character, say for instance even one half a volt for some purposes will be
ample, but dependent for such strength on the color desired; the strength of the
solution; the temperature and other circumstances.
The proportions of the components of this electrolytic or finishing or after
treating solution may be considerably varied dependent a great deal on the color
or shade of color desired to be developed.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
1. The process or method of obtaining chromium alloys and depositing such
alloys upon metallic surfaces with the aid of a suitable electrolyte and the finishing
or further treatment of electro-deposits so obtained in manner substantially as
described.
-
2. The process or method of obtaining chromium alloys and depositing such
alloys upon metallic surfaces with the aid of a suitable electrolyte in manner
substantially as described.
DL 10
D100A