Improvements in Fluxes or Solutions for Coating Metals with Lead.
Year: 1890

page_text: Date of Application, 12th Aug., 1890
Complete Specification Left, 6th May, 1891-Accepted, 6th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in Fluxes or Solutions for Coating Metals
with Lead.
1, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark,
of 53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of
Patent Agents, do hereby declare the nature of this invention (a communication to
me from abroad by William Gregory Horgan of 129, East 104th Street in the
City County and State of New York, United States of America Contractor,) to
be as follows:
The object of this invention is to coat articles of iron or other metals with a
regular, smooth, and even coating of lead without previously giving to the metal
any coating or galvanizing of other metals for the purpose of preparing them for
receiving the lead coating.
I will now describe the invention, as applied to the coating of sheet iron but I
do not limit or confine myself to this application as it is equally applicable for
coating steel, and cast or inalleable iron.
In carrying out the invention, I first clean the sheets of sheet iron from scale by
immersing them in a vat containing dilute sulphuric acid which is steam heated to
render it more active. I then remove the sheet from the acid and wash it with
water. The sheet is then placed in a vat containing water to which is added lime
or other alkaline salts to prevent oxidation and act as a flux. I then put the sheet
in a vat containing dilute hydrochloric acid in which is placed a slab of zinc upon
which the acid acts forming a solution of chloride of zinc. To this solution are also
added certain proportions of oxalic acid chloride of ammonium and sulphite of soda
according to the quantity of material treated. The proportion of oxalic acid and
sulphite of soda depends entirely upon the quality of the iron or steel treated, but
as an average I use 20 lbs. of oxalic acid and 10 lbs. of sulphite of soda per ton of
iron, in the dilute hydrochloric acid and zinc bath.
After immersion in this solution, the sheets are dipped into or passed through
melted lead, and as the sheets are withdrawn from the lead a portion of the lend
adheres to the surface of the iron while the surplus drains off into the vat containing
the melted metal.
The lead thus applied to the sheet of iron forms a very closely-adherent coating
amalgamating with the iron which resists the action of the atmosphere and the
sheet while possessing more than the rigidity and strength of iron has all the
advantages of being unoxidisable. The use of oxalic acid and sulphite of soda in
the bath prevents oxidation and causes a more perfect adhesion of the lead to
the iron.
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1000
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
A.
MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Fluxes or Solutions for Coating Metals
with Lead.
I, ALEXANDER MELVILLE CLARK of the firm of A. M. and Wm. Clark,
f 53, Chancery Lane in the County of Middlesex, Fellow of the Institute of
Patent Agents, do hereby declare the nature of this invention (a communication
Pics Ad

page_text: to me from abroad by William Gregory Horgan of 129, East 104th Street in the
City County and State of New York United States of America, Contractor)
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The object of this invention is to coat articles of iron or other metals with a
regular smooth and even coating of lead, without previously giving to the metal
any coating or galvanizing of other metals for the purpose of preparing them for
receiving the lead coating.
I will now describe the invention as applied to the coating of sheet iron, but I do
not limit or confine myself to this application, as it is equally applicable for coating
steel, and cast or malleable iron.
In carrying out the invention, I first clean the sheets of sheet iron from scale, by
immersing them in a vat containing dilute sulphuric acid, which is steam heated to
render it more active. I then remove the sheet from the acid and wash it with
water. The sheet is then placed in a vat containing water to which is added lime
or other alkaline salts, to prevent oxidation and act as a flux. I then put the sheet
in a vat containing dilute hydrochloric acid, in which is placed a slab of zine upon
which the acid acts, forming a solution of chloride of zinc. To this solution are
also added certain proportions of oxalic acid, chloride of ammonium and sulphite of
soda, according to the quantity of material treated. The proportion of oxalic acid
and sulphite of soda depends entirely upon the quality of the iron or steel treated,
but as an average I use 20 lbs. of oxalic acid and 10 lbs. of sulphite of soda per
ton of iron, in the dilute hydrochloric acid and zinc bath.
After immersion in this solution, the sheets are dipped into or passed through
melted lead, and as the sheets are withdrawn from the lead, a portion of the lead
adheres to the surface of the iron, while the surplus drains off into the vat containing
the melted metal.
The lead thus applied to the sheet of iron forms a very closely adherent coating,
amalgamating with the iron which resists the action of the atmosphere, and the
sheet while possessing more than the rigidity and strength of iron, has all the
advantages of being unoxidable. The use of oxalic acid and sulphite of soda in
the bath prevents oxidation, and causes a more perfect adhesion of the lead to
the iron.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is―
A solution for the preparation of iron or other metals for coating them with
lead, said solution consisting of chloride of zinc, oxalic acid, chloride of ammonium,
and sulphite of soda, as specified.
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CURTAT fun wa sura na
1001
A. MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.