IMPROVEMENTS IN THE MANUFACTURE OF 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 IN
THE MANUFACTURE OF CHROMIUM ALLOYS to be as follows:-
:
The production of the alloys of chromium has been heretofore attended with so
much difficulty that so far as I am aware these alloys have never been made in any
practical quantity if at all.
The object of my invention is to enable chromium alloys to be obtained in an
economical manner and so as to render them so obtained available for use in the
arts particularly in plating other metals therewith.
In carrying out my invention I tako chromate of potash or other salt or salts
of chromium, or chromic acid with about an equal weight of charcoal in coarse
grains and I subject the same to heat in a covered crucible and when the mass is
softened by heat I pour thereon about two and a half times the weight of the
combined mass of copper in a molten state and from another crucible. I further
add about one half to two parts of tin in a molten state from another crucible and
I cause all these ingredients to be well mixed together by prolonging the heating
aided by frequent stirring and when the mass of the combined matters has been
brought to a suitably fluid condition I pour the mixture into water for the purpose
of reducing or disintegrating the same and bring it into the desired reduced state
or to induce granulation, as is well understood in effecting the reduction of other.
metals.
This operation is effected preparatory to the remelting of the combined matters-
In remelting this granulated alloy I employ a flux composed of
1 part of Biborate of soda
2 parts of Nitrate of potash, and
2 parts of Carbonato of Potash
and when the metal is sufficiently melted I cast the same into a mould or otherwise
form it, so as to obtain plates rods, ingots, or other forms of the alloy so as to render.
it fit for useful employment in the arts.
The alloy thus formed will be found to be of a rich golden yellow color.
The color of the produced alloy may be modified however by the addition of
another clement to the mixture. Thus when it is desired to produce o white allow

page_text: of chromium I employ chromium salts or oxides as when proceeding according to
the foregoing process for obtaining the yellow alloy adding thereto however about
1 part of metallic nickel and from about three to four parts of metallic tin mixed
with about the same proportionate quantity of metallic copper.
The plates, rods, ingots or other forms of the alloys thus obtained will be found
applicable in the arts for various useful purposes such for instance as in the plating
of metala.
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
THE MANUFACTURE OF CHROMIUM ALLOYS and in what manner the same is to be 1
performed, to be particularly described and ascertained in and by the following
statement :-
The production of the alloys of Chromium has been heretofore attended with so
much difficulty that so far as I am aware these alloys have never been made in any
practical quantity if at all or brought into commerce.
The object of my invention is to enable chromium alloys to bo obtained in an
economical manner and so as to render them so obtained available for use in the
arts, particularly in plating other metals therewith.
In carrying out my invention I take chromate of potash or other salt or salts
of chromium, or chromic acid with about an equal weight of charcoal in coarse
grains and I subject the same to heat in a covered crucible and when the mass is
softened by heat I pour theroon about two and a half times tho weight of tho
combined mass of copper in a molten state and from another crucible. I further
add about one half to two parts of tin in a molten state from another crucible and
I cause all these ingredients to be well mixed together by prolonging the heating
aided by frequent stirring and when the mass of the combined inatters has been
brought to a suitably fluid condition I pour the mixture into water for the purpose
of reducing or disintegrating the same and bring it into the desired reduced state
or to induce granulation as is well understood in effecting the reduction of other
metals.
This operation is effected preparatory to the remelting of the combined matters.
In remelting this granulated alloy I employ a flux composed of
1 part of biborate of soda
2 parts of nitrate of potash
and
2 parts of carbonate of potash
and when the metal is sufficiently melted I cast the same into a mould or otherwise
form it so as to obtain plates, rods, ingots, or other forms of the alloy so as to
render it fit for useful employment in the arts.

page_text: The color of the produced alloy may be modified however by the addition of
another element to the mixture.
Thus when it is desired to produce a whito alloy of chromium I employ chromium.
salts or oxides as when proceeding according to the foregoing process of obtaining
the yellow alloy adding thereto however, about 1 part of metallic nickel and from
about 3 to 4 parts of metallic tin mixed with about the same proportionate quantity
of metallic copper..
The plates, rods, ingots or other forms of the alloys thus obtained will be found
applicable in the arts for various useful purposes such for instance as in the plating
of metals.
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
The production of alloys of chromium copper and tin with or without admixture
of nickel or other color modifying element in manner substantially as set forth.