AN IMPROVED PROCESS FOR COATING IRON OR OTHER METALS WITH TIN, LEAD, OR TERNE
Year: 1884

page_text: I, ADOLPH GUTENSOHN, of Globe Wharf, Mile End Road, in the County of
Middlesex, Manufacturing Chemist do hereby declare the nature of my invention.
for "AN IMPROVED PROCESS FOR COATING IRON OR OTHER METALS WITH TIN,
LEAD, OR TERNE" to be as follows:-
.
This invention relates more especially to the manufacture of what are known as
tin or terne plates, consisting of sheet iron or other plates coated with tin, lead, or
terue, a compound of both materials. It has for its object an improved process for
so coating iron, steel, or other plates by which great economy and cheapness in the
manufacture are attained.
In order to put my invention in operation I take plates or shects of iron, steel,
or other metals and having cleaned them in the ordinary way, I pass them through
a hot solution of sal-ammoniac.
I make this solution of such strength that on cooling the sal-ammoniac
crystallizes and I add to it a small proportion which may be varied more or
less, of free hydrochloric acid in which resin has been dissolved.
The proportion of resin or resinous matter so used is not great as the hydro-'
chloric acid is capable of dissolving only a small quantity, but the presence of the
resin is sufficient to prevent the plates from being affected by the solution only
partially or in patches.
In order to increase the quantity of resin or resinous matter dissolved by the.
hydrochloric acid, I add to the latter a small proportion of glycerine, and in order
to make the resin more easily soluble I dissolve it in paraffin oil and I add to the
solution liquid ammonia, a jelly being formed from which jelly a considerable
quantity of resin is dissolved out by hydrochloric acid added to it hot.
The relative proportions of sal-ammoniac. and hydrochloric acid having resin
dissolved in it as described may be varied, but I prefer that the whole compound,
which is preferably used hot, should be so strong that on cooling it deposits
crystals.
The plates to be coated having been submitted to the action of the solution
described are then removed and dipped or passed in the usual way through a vessel
containing melted tin or lead, or both.

page_text: In the process ordinarily used for coating plates with tin or lead, their surface is
first greased or covered with some greasy substance..
By my improved process the use of such greasy substance, or of metal solutions
which have sometimes been used for the same purpose, is not requisite, and
considerable economy is consequently effected in the manufacture of the coated
plates, as the cost of the solution described is less than that of treating the plates
with greasy substance in the ordinary way whilst the danger of any third metal
being left between the metal to be coated and that with which it is coated is
avoided.
The novel process described may be used, not only for manufacturing tin, terne,
or lead-coated plates, but it may be used for the purpose of tinning and soldering
generally, and for coating not only plates, but iron or other metals in any other
form with tin, lead, or terne.
D
7411 1
7004.

page_text: I, ADOLPH GUTENSOON, of Globe Wharf, Mile End Road, in the County of
Middlesex, Manufacturing Chemist, do hereby declaro the nature of my invention
for "AN IMPROVED PROCESS FOR COATING IRON OR OTHER METALS WITH TIN,
LEAD, OR TERNE" and in what manner the same is to be performed; to be
particularly described and ascertained in and by the following statement :-
"
My invention relates more especially to the manufacture of what are known as.
tin or terne plates, consisting of sheets of iron or other metal coated with tin, lead
or terne a compound of both metals.
It has for its object an improved process for so coating iron, steel, or other plates,.
by which process great economy and cheapness in the manufacture are attained.
In order to put my invention in operation I take sheets or plates of iron, steel,
or other metal, and having cleaned their surface in the usual way by the process of
pickling" in dilute acid, I pass them through a hot solution of sal-ammoniac, the
strength of which may be varied more or less but which I prefer to use of such
strength that as the solution cools the sal-ammoniac crystallizes, and I add to it a
small proportion (which may be varied more or less) of free hydrochloric acid in
which resin has been dissolved.
The hydrochloric acid is only capable of so dissolving a small proportion of resin,
the presence of which however is sufficient to prevent the metal plates, when
passed as described through the hot solution containing it, from being affected by
the solution only partially or in patches.
In order to increase the quantity of resin or resinous matter dissolved in the
hydrochloric acid, I add to the latter a small proportion of glycerine; or preferably
(as being a quicker process) I dissolve the resin in hot glycerine, the temperature
of which may be varied but which I prefer to use nearly boiling, and I add the hot
hydrochloric acid to this solution of resin in glycerine.
And in order to render the resin more readily soluble by the bydrochloric acid
I sometimes dissolve it first in paraffin oil and add to the solution a sufficient
quantity of liquid ammonia, when a jelly is formed from which a considerablo
quantity of resin is dissolved out by hydrochloric acid added to it hot.
The relative proportions of sal-ammoniac and hydrochloric acid having resin
dissolved in it as above described may be varied, but I prefer that the whole
compound (which is preferably used hot so that the metal sheets are not chilled
when immersed in it) should be so strong that it deposits crystals on cooling.
The iron, steel, or other sheets or plates to be coated having been submitted to
the action of the solution described are removed from it and dipped or passed in
the usual way through melted tin, or lead, or terne, and the surplus metal having
been removed they are finished by the processes ordinarily used.
In the ordinary method of manufacturing such plates, their surface is first
greased or covered with some greasy substance, but by my improved process the
use of such greasy substance, or of metal solutions which have sometimes been'
used for the same purpose, is unnecessary, and considerable economy is consequently
effected in the manufacture, as the cost of treating the sheets or plates with the
solution described is less than that of treating them with a greasy substance in the
ordinary way, whilst the danger of any third metal being left between the metal
to be coated and that with which it is coated, is avoided.
The novel process described may be used not only for manufacturing tin, lead, or
terne, plates, but it may be used for the purpose of tinning and soldering generally,
and for coating iron or other metals in any other form as well as in sheets, with
tin, lead, or terne.

page_text: 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
1. For the purpose of preparing the surface of iron, steel, or other metal, to
receive a coating of tin, lead, or terne, the solution composed of resin or resinous
matter dissolved in hydrochloric acid and glycerine with sal ammoniac, prepared
and used substantially in the manner herein described.
2. In order to increase the quantity of resin or resinous matter dissolved by the
hydrochloric acid in order to form such solution, the method of dissolving the resin
in paraffin oil and of adding to the solution liquid ammonia so as to form a jelly
from which the resin is readily dissolved by hydrochloric acid, substantially as and
for the purpose herein described.
EDWARDS & Co.,
Agents for the Patentee.