Improvement relating to the Coating of Articles with Zinc.
Year: 1892

page_text: Date of Application, 29th Aug., 1892
Complete Specification Left, 27th May, 1893-Accepted, 1st July, 1893
PROVISIONAL SPECIFICATION.
Improvement relating to the Coating of Articles with Zinc.
I, ERNST HEINRICH LOUIS STÜRZEL, Director of the Hammonia Metallwaaren
Fabrik A. G., vorm. Stürzel & Co., of Hamburg-Barmbek, of 58, Bramfelderstrasse,
Hamburg, in the Empire of Germany, do hereby declare the nature of this invention
to be as follows:-
My invention relates to a method of coating articles with zinc.
For preventing oxidation, zinc-baths (molten zinc) have heretofore been provided
with a protecting cover of sal-ammoniac, fat and glycerine. Such a cover, however,
renders an immediate washing and drying of the coated articles necessary, which is
very troublesome. I have endeavoured to produce a protecting cover which
possesses all the good properties of the cover heretofore employed without causing
the inconveniences adhering to them. This object I have attained by utilizing the
property of aluminium of not entering into any combination with zinc. As its
melting point is considerably higher than that of zinc the aluminium is melted
in a separate crucible and conducted on to the zinc bath. In this manner I am
enabled to reduce the formation of ashes and also that of hard zinc to approxi-
mately half the amount which has been converted into waste materials with the
methods hitherto practised. Morcover, when such an aluminium protecting cover
is employed an extremely fine coating can be produced upon the articles so that a
considerable saving of zinc is obtained.
Dated this 29th day of August 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvement relating to the Coating of Articles with Zinc.
I, ERNST HEINRICH LOUIS STÜRZEL, Director of the Hammonia Metall waaren-
Fabrik A. G. vorm. Stürzel & Co., of 58, Bramfelderstrasse, Hamburg-Barnbeck
in the Empire of Germany, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
My invention relates to a method of coating articles, particularly of iron, with
zinc in the manner which is commonly called, galvanizing.
For preventing oxidation, zinc baths (molten zinc) have heretofore been provided
with a protecting cover or coating of sal-ammoniac, fat and glycerine. Such a
cover, however, renders an immediate washing and drying of the coated articles
necessary, which is very troublesome.
I have therefore produced a protecting coating which possesses all the good
properties of the covers heretofore employed without causing the inconveniences
attending them, and I have obtained this object by employing metallic aluminium,
which only enters into combination with zinc in the proportion corresponding with
the atomic weights of the metals, provided, that the melting of the latter has
been performed under a cover of common salt (chloride of sodium) and chloride of
potassium.
As its melting point is considerably higher than that of zinc, the aluminium is
melted in a separate crucible and conducted to the zinc bath, which will thus be
covered by a thin film of aluminium.

page_text: In this manner I am enabled to reduce the formation of ashes and also that of
hard zinc to approximately half the amount which has been converted into waste
materials with the methods heretofore practised. Moreover, when such an
aluminium protecting cover is employed an extremely fine coating of zinc can be
produced upon the articles, so that a considerable saving of zinc is obtained.
I am aware that composite baths, having metallic aluminium diffused throughout
a bath of metallic zinc have been heretofore employed in the "galvanizing" process
and I therefore wish it understood that such composite baths are not included in
my invention, as I do not intend to produce an aluminium zinc alloy or a coating
on the metallic articles which must be a recognizable alloy.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :--
In the process of coating articles with zinc a cover of metallic aluminium
conducted when in the molten state to the zinc bath, substantially as and for the
purpose set forth.
Dated this 27th dow of M 1902
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.