AN IMPROVED PROCESS FOR COATING METALS WITH TIN
Year: 1877

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for the Invention of
"AN IMPROVED PROCESS FOR COATING METALS WITH TIN." A communication
from abroad by Neuburg and Co., of Vienna, Austria.
Sealed the 11th January 1878, and dated the 15th September 1877.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at
the Office of the Commissioners of Patents on the 15th September 1877.
16
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. AN IMPROVED PROCESS FOR COATING METALS
WITH TIN." [A communication from abroad by Neuburg and Co., of Vienna,
Austria.]
These improvements relate to an improved process for coating metals, more
especially iron plates, with tin. For this purpose a zinc and carbon battery is used;
the inner cell containing the carbon is half filled with chromic acid, and the outer
cell containing the zinc is filled with dilute sulphuric acid.
The articles to be coated with tin are put into a bath composed as described
below, and are connected by a wire with the positive end of the battery, whilst the
negative end of the battery is connected with a piece of tin hung in the same bath.
When the article has been sufficiently coated with tin it is taken out and held over
a fire in order to give the tin a lustre.
The said bath is composed of chloride of tin and cream of tartar, with or without
tin salt. The proportions of these ingredients are as follows:-Eight parts of
chloride of tin, sixteen parts of cream of tartar, and two parts of tin salt, if the
latter is used. When the tin salt is present the tin coating is effected more rapidly,
whereas when the bath is composed of chloride of tin and cream of tartar only the
tin coating is very white, but is not produced so rapidly as when the salt is used.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Robert Lake in the Great Seal Patent Office on the
15th March 1878.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, and Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED PROCESS FOR COATING METALS
WITH TIN." A communication from abroad by Neuburg and Co., of Vienna,
Austria.
This Invention relates to an improved process for coating metals, more especially
iron plates, with tin. For this purpose a zinc and carbon battery is used; the
inner cell containing the carbon is half filled with chromic acid, and the outer cell
containing the zinc is filled with dilute sulphuric acid.
The articles to be coated with tin are put into a bath composed of protochloride
of tin and cream of tartar, with or without chloride of tin (tin salt). The propor-
tions of these ingredients are as follows:-Eight parts of protochloride of tin,
sixteen parts of cream of tartar, and two parts of the chloride or tin salt, if the
latter is used. When this tin salt is present the tin coating is effected more rapidly,
whereas when the bath is composed of protochloride of tin and cream of tartar only
the tin coating is very white, but is not produced so rapidly as when the chloride
or tin salt is used. These ingredients should be dissolved in about 500 litres or
about 100 gallons of distilled water.
The black plates are first "pickled" in any suitable manner, and then immersed
in the above-described bath or solution, and are allowed to remain in the same for a
longer or shorter time, according to the thickness of the deposit or coating of tin
required on the plates. While in this bath the plates or other pieces to be coated
are connected by a wire with the positive end of the battery, whilst the negative
end of the battery is connected with a piece of tin hung in the same bath. When
the plates or other pieces or articles have been sufficiently coated with tin they are
taken out and held over a fire in order to give the tin a lustrous appearance.
Having thus fully described the said Invention as communicated to me by my
foreign correspondents, and the manner of performing the same, I wish it understood
that I claim the improved process for coating metals with tin, as above described.
In witness whereof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Fifteenth day of March, in the year of our Lord One
thousand eight hundred and seventy-eight.
XTYM DADT TATT