An Improved Method of Galvanizing Iron and Steel.
Year: 1886

page_text: Date of Application, 1st Nov, 1886
Complete Left, 30th July, 1887
Complete Accepted, 18th Oct., 1887
[Communicated from abroad by AUGUST SCHAAG, of Anklamerstrasse, Berlin, Chemist,
and the firm of FLÜRSCHEIM and BERGMANN, of Eisenwerke, Gaggenau, in the
Empire of Germany, Manufacturers.]
An Improved Method of Galvanizing Iron and Steel.
JOSEPH THEODORE DANN, 32 Canterbury Road, Brixton, in the County of
Surrey, gentleman do hereby declare the nature of this invention to be as
follows:-
This Invention has for its object to provide a safe and easy means of preventing the
corrosion of cast and wrought iron and steel. Instead of applying zinc in the manner
in which this has been done hitherto in the making of galvanized iron, I use salts of
zinc and salts of magnesia soluble in water, mixed in variable proportions, for example
two parts of salts of zinc to one part of salts of magnesia, so that a mixture made up
of such ingredients may be dissolved in a galvanoplastic bath, the anodes being formed
of metallic zinc or other suitable metal, and the galvanoplastic process itself being the
usual one.
The advantages of such method are that it may be applied with little
expense to every description of iron and steel, whether forged, rolled, or cast, even to
castings to which no durable zinc-coating could hitherto be applied, either by mechanical
or by chemical means, without obliterating the delicacy of the sculptural lines; also
that the coating adheres very firmly to the metal to which it is applied, and that iron
and steel coated therewith are less susceptible of corrosion than the usual descriptions
of galvanized iron.
TL
1
1000

page_text: JOSEPH THEODORE DANN, 32 Canterbury Road, Brixton, in the County of Surrey,
gentleman do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
This Invention has for its object to provide a safe and easy means of preventing the
corrosion of cast and wrought iron and steel. Instead of applying zinc in the
manner in which this has been done hitherto in the making of galvanized iron, I use
any salt of zinc and any salt of magnesia soluble in water, mixed in variable
proportions, for example two parts of salt of zinc to one part of salts of magnesia, so
that a mixture made up of such ingredients may be dissolved in a galvanoplastic bath,
the anodes being formed of metallic zinc or other suitable metal, and the galvanoplastic
process itself being the usual one. With a view to expedite the process, bichloride of
mercury or muriate of ammonia may be superadded to the mixture; for example with
100 parts of water may be mixed 8 parts of a salt of zinc such as sulfate of zinc, 4 parts of a
salt of magnesia and from 2 to 3 parts of bichloride of mercury; or else to every
100 parts of water 5 parts of a salt of zinc, 2 parts of a salt of magnesia and 4 parts
of muriate of ammonia. The advantages of such method are that it may be applied
with little expense to every description of iron and steel, whether forged, rolled, or
cast, even to castings to which no durable zinc-coating could hitherto be applied, either
by mechanical or by chemical means, without obliterating the delicacy of the sculptural
lines; also that the coating adheres very firmly to the metal to which it is applied, and
that iron and steel coated therewith are less susceptible of corrosion than the usual
descriptions of galvanized iron.
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 :
In the making of galvanized iron, the use or employment of salts of zinc and salts
of magnesia soluble in water, with or without bichloride of mercury or muriate of
ammonia superadded thereto; in the manner and for the purpose herein set
forth.
JOSEPH THEODORE DANN,
32, Canterbury Road,
Brixton, S.W.