Improvements in or relating to the Coating of Metallic Tubes and of other Articles.
Year: 1888

page_text: Date of Application, 27th Mar., 1888
Complete Specification Left, 27th Dec.. 1888
Complete Specification Accepted. 5th Feb., 1889
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Coating of Metallic Tubes and
of other Articles.
We, WILLIAM CLARK, Engineer, of 15, Fairthorn Road, Charlton, in the County
of Kent, and WILLIAM REID, Merchant of the Firm of William Reid & Co., of
45, Fenchurch Street, in the City of London, do hereby declare the nature of our
said Invention, to be as follows:-
This Invention relates to improvements in or applicable to the coating of metal tubes
and of other articles exposed to the action of water or other oxidizing or corrosive
medium, with anti-corrosive white metal for preventing injurious action of the water
or such other mediuin on such tubes or articles.
Such anti corrosive white metal may be variously compounded and many existing
anti-friction white metals may be, in accordance with the present improvements,
applied to and used for the purpose of the Invention.
In applying the Invention to the coating of metallic tubes to which it is especially
applicable, the tube is firstly prepared, or well cleaned by the application thereto of
spirits of salt, after which it is placed in a bath of tin and wiped down, and while still
hot is placed in a suitable receptacle containing the anti-corrosive metal in a molten
state, and is suitably guided therein towards a die or gauge ring of the desired diameter
of the tube and coating combined situated towards the lower part of one end of the
receptacle above the normal level of the contained molten metal, and into the widened
end of which die or gauge ring the end of the tube is inserted, whereupon the vessel
is tilted about centre bearings so as to cause the contained molten metal to surround
the tube in the vicinity of the die through which the tube is then passed. By such
means as the tube passes through the die the coating metal is gradually compressed
about the tube and caused to firmly adhere thereto, in a coating of the desired
thickness.
In applying the Invention to the coating of part of an article such for instance as a
propeller blade, the latter is heated to a temperature somewhat below the melting

page_text: point of the coating metal and is well cleaned with spirits of salt, having its surface
cut or nicked with a chisel at suitable parts, and is coated with tin, and the coating
metal in a semi-molten state is then laid on or it may be cast about the part desired.
If it is desired to effect the stopping of pitting in propeller blades or to coat part of
a boiler plate, the cavity or part affected is thoroughly well cleaned out with spirits of
salt, so that no oxide or other foreign matter remains, the iron is nicked a little with a
chisel and is well tinned, and the anticorrosive metal applied and rubbed down.
Dated this 22nd day of March 1888.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicants.

page_text: Improvements in or relating to the Coating of Metallic Tubes and
of other Articles.
We, WILLIAM CLARK, Engineer, of 15, Fairthorn Road, Charlton, in the County
of Kent, and WILLIAM REID, Merchant, of the Firm of William Reid & Co., of
45, Fenchurch Street, in the City of London, do hereby declare the nature of the said
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 relates to improvements in or applicable to the coating of metal tubes
and of other articles exposed to the action of water or other oxidizing or corrosive
medium, with any metal or alloy adapted and suitable for diminishing the liability to
corrosion of such tubes or articles.
The Invention is especially applicable to the coating of metallic tubes, and apparatus
suitable for such purpose is illustrated on the accompanying sheet of drawings in
sectional elevation in Fig. 1. and in plan view in Fig. 2.
Such apparatus consists essentially of an open bath, 3, which is pivotted on suitably
supported trunnions, 4, and is adapted at an end angle with one or more removable
dies or ring guages, 5, of gradually diminishing diameter, and which is or are so
located as to occupy a position above the level of the molten coating metal when the
bath occupies the position indicated by the dotted lines. The bath is also fitted with
guiding rolls, 6, supported in bearings, 10, and so arranged relatively to the die or
ring gauge, 5, as to direct the tube intended to be coated into the slightly enlarged
end thereof, and with an under atmospheric gas burner tube, 7, arranged parallel with
the under side of and slightly below the bottom of the bath and moving therewith.
In coating tubes according to the present improvements, the tube, 8, is firstly well
cleaned with hydrochloric or other suitable acid, after which it is heated and placed in
a bath of tin and wiped down, and while still hot is placed on the guiding rolls, 6, and
directed into the ring gauge, 5, whereupon, the bath containing the molten coating
metal is tilted about its trunnions, 4, to the position indicated in full lines so as to
cause the molten metal to surround the tube in the vicinity of the die through which
the tube is then passed. The coating of tin amalgamates or alloys with the outer
coating metal and the passing of the coated tube through the die or ring gauge causes
the coating metal to be compressed about the tube, the result being the complete
adherence to the tube of a coating of an even and desired thickness. The die is
surrounded with a water jacket, 9, partaking of its movements, and through which a
stream of cool water may be passed by suitable connections, so as to keep the die cool,
which will be effective in preventing any running of the coating metal and in causing
the coating to receive a brightly finished exterior.
In applying the Invention to the coating of part of an article such for instance as
a propeller blade, the surface of the latter is firstly cut or nicked with a chisel or
suitable instrument at suitable parts, and is then well cleaned as aforesaid, after which

page_text: the blade or article is heated to a temperature somewhat below the melting point of
the coating metal and is firstly tinned and is then coated with the coating metal which
is laid on in a semi-molten condition with any suitable tool, or it may be cast about the
part or parts desired.
If it is desired to effect the stopping of pitting in propeller blades or to coat part of
a boiler plate or to effect like repairs in other articles the cavity or part affected is
treated in like manner as aforesaid, the coating or filling up metal being laid on the
hot tinned part in a semi molten condition and rubbed down or being cast
thereabout.
Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed, we declare that what we
claim is,
1. The process of coating oxidizable metal tubes with any suitable comparatively
inoxidisable metal or alloy for diminishing the liability thereof to corrosion, consisting
in cleaning the surface of the tube to be coated with any suitable acid, then heating
and tinning the same and while still hot passing it through the molten coating metal
and through a die to which the coating metal has access and whereby the coating
metal is caused to be compressed in even thickness about and around the tube,
substantially as herein before described.
2. The arrangement of apparatus hereinbefore described with reference to the
accompanying drawings, and the application thereof for the purpose of applying the
molten coating metal to the cleaned and tinned tube.
3. The process of coating oxidizable propeller blades, boiler plates or other articles
with any suitable comparatively inoxidizable metal or alloy for the purpose aforesaid,
and of stopping pitting in propeller blades or boiler plates or effecting like repairs in
other articles with such metal or alloy, consisting in nicking, cleaning, heating and
tinning the blade, plate or article, and then applying the coating metal thereto by
laying it on in a semi molten condition or casting it about the part or parts desired,
substantially as hereinbefore described.
Dated this 24th Ja
1
1000
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C.,
Agents for the Applicants.