Title of Invention	AN IMPROVED SURFACE TREATMENT
Abstract	A method ormanufacture of a metal article having a substantially corrosion free surface comprising the steps of degreasing the article by vapour, dip or spray degreasing~ grit blasting the degreased surface with steel shots~ coating the surface with molten aluminium powder by spraying the same on the said surface up to a thickness of 50 microns, said molten alum inium being prepared by melting alum inium in wire form; powder coating the surface up to 30-40 microns with silicon based powder; and curing the said surface.

Title of Invention

AN IMPROVED SURFACE TREATMENT

Abstract

A method ormanufacture of a metal article having a substantially corrosion free surface comprising the steps of degreasing the article by vapour, dip or spray degreasing~ grit blasting the degreased surface with steel shots~ coating the surface with molten aluminium powder by spraying the same on the said surface up to a thickness of 50 microns, said molten alum inium being prepared by melting alum inium in wire form; powder coating the surface up to 30-40 microns with silicon based powder; and curing the said surface.

Full Text	This invention relates to a method of manufacture of a metal article having a substantially corrosion free surface Motor vehicles fitted with fossil fuel engines are provided with exhaust mufflers to reduce the noise. The external surface of these mufflers, especially those for two wheelers, are usually painted or chrome plated for aesthetic appeal and for preventing corrosion. However the high temperature to which the interior of the muffler is exposed eventually leads to the paint or plating peeling off and results in corrosion of the . surface. The known methods of preventing corrosion by the use of black chrome plating or painting with heat resistant black paint are expensive, require more cyclic time and lead to the formation of toxic chemicals as by products, causing environmental hazards. This invention therefore proposes a method by which metal articles having a substantially corrosion free surfaces can be manufactured, economically and effectively, without giving rise to toxic waste. The method of manufacture of a metal article having a substantially corrosion free surface, according to this invention, comprises the steps of degreasing the article by vapour, dip or spray degreasing; grit blasting the degreased surface with steel shots; characterised by coating the surface with molten aluminium by spraying the same on the said surface up to a thickness of 50 microns, said molten aluminium being prepared by melting aluminium in wire form ; powder coating the surface up to 30-40 microns with silicon based powder; and curing the said surface. The preferred range of thickness of the aluminium coating is up to 50 microns and that of the powder coating is 30-40 microns. This invention will now be further described by reference to an Example as illustrative of its scope. EXAMPLE The surface of the article to be manufactured is degreased by a solvent emulsion cleaner for 3 _4-removing all types of oil and grease. The degreasing operation is conveniently carried out in a washing machine. The degreased surface is then grit blasted using steel shots of 0.5 mm size. These shots are spherical heat treated (50 HRc). The surface is then coated with molten aluminium using arc spraying and aluminium wire (99 % purity), by which aluminium continuously melts, gets atomised and blown on to the surface of the article by compressed air to form a coating of 45 microns. Next, the aluminium coated surface is further powder coated with silicon based powder which withstands a temperature of 550 deg., the thickness of such coating being 30 microns. The surface of the article so obtained is then cured In a conveyor type oven or in a batch type oven. The terms and expressions herein are of description and not of limitation, there being no intention to exclude any equivalents of the features illustrated and described, but it is understood that various other ways of carrying out the said method are possible without departing from the scope and ambit of this invention. We Claim; 1. A method of manufacture of a metal article having a substantially corrosion free surface comprising the steps of degreasing the article by vapour, dip or spray degreasing; grit blasting the degreased surface with steel shots; characterised by coating the surface with molten aluminium by spraying the same on the said surface up to a thickness of 50 microns,said molten aluminium being prepared by melting aluminium in wire form ; powder coating the surface up to 3040 microns with silicon based powder and curing the said surface. 2. A method as claimed in Claim 1 wherein the molten aluminium is sprayed by compressed air. 3. A method as claimed in Claim 1 and Claim 2 wherein the curing is carried out in a conveyor type oven. 4. A method as claimed in Claim 1 and Claim 2 wherein the curing is carried out in a batch type oven. 5. A method of manufacture of a metal article having a sub.stantially corrosion free surface substantially as herein described with reference to, and as illustrated by, the Example. 6. A metal article having a substantially corrosion free surface whenever manufactured by a method as claimed in any one of the preceding Claims. Dated this the 29th day of July 2002 TVS Motor Company Limited By Their Attorney

Full Text

This invention relates to a method of manufacture of a metal article having a substantially corrosion free surface
Motor vehicles fitted with fossil fuel engines are provided with exhaust mufflers to reduce the noise. The external surface of these mufflers, especially those for two wheelers, are usually painted or chrome plated for aesthetic appeal and for preventing corrosion. However the high temperature to which the interior of the muffler is exposed eventually leads to the paint or plating peeling off and results in corrosion of the . surface.
The known methods of preventing corrosion by the use of black chrome plating or painting with heat resistant black paint are expensive, require more cyclic time and lead to the formation of toxic chemicals as by products, causing environmental hazards.
This invention therefore proposes a method by which metal articles having a substantially corrosion free surfaces can be manufactured, economically and

effectively, without giving rise to toxic waste.
The method of manufacture of a metal article having a substantially corrosion free surface, according to this invention, comprises the steps of degreasing the article by vapour, dip or spray degreasing; grit blasting the degreased surface with steel shots; characterised by coating the surface with molten aluminium by spraying the same on the said surface up to a thickness of 50 microns, said molten aluminium being prepared by melting aluminium in wire form ; powder coating the surface up to 30-40 microns with silicon based powder; and curing the said surface.
The preferred range of thickness of the aluminium coating is up to 50 microns and that of the powder coating is 30-40 microns.
This invention will now be further described by reference to an Example as illustrative of its scope.
EXAMPLE
The surface of the article to be manufactured is degreased
by a solvent emulsion cleaner for
3

_4-removing all types of oil and grease. The degreasing operation is conveniently carried out in a washing machine.
The degreased surface is then grit blasted
using steel shots of 0.5 mm size. These shots are
spherical heat treated (50 HRc).
The surface is then coated with molten aluminium using arc spraying and aluminium wire (99 % purity), by which aluminium continuously melts, gets atomised and blown on to the surface of the article by compressed air to form a coating of 45 microns.
Next, the aluminium coated surface is further powder coated with silicon based powder which withstands a temperature of 550 deg., the thickness of such coating being 30 microns.
The surface of the article so obtained is then cured In a conveyor type oven or in a batch type oven.
The terms and expressions herein are of description and not of limitation, there being no intention to exclude

any equivalents of the features illustrated and described, but it is understood that various other ways of carrying out the said method are possible without departing from the scope and ambit of this invention.

We Claim;
1. A method of manufacture of a metal article having a
substantially corrosion free surface comprising the steps of
degreasing the article by vapour, dip or spray degreasing;
grit blasting the degreased surface with steel shots;
characterised by coating the surface with molten aluminium
by spraying the same on the said surface up to a thickness of
50 microns,said molten aluminium being prepared by
melting aluminium in wire form ; powder coating the
surface up to 3040 microns with silicon based powder and
curing the said surface.
2. A method as claimed in Claim 1 wherein the molten
aluminium is sprayed by compressed air.
3. A method as claimed in Claim 1 and Claim 2 wherein the
curing is carried out in a conveyor type oven.
4. A method as claimed in Claim 1 and Claim 2 wherein the
curing is carried out in a batch type oven.
5. A method of manufacture of a metal article having a
sub.stantially corrosion free surface substantially as herein
described with reference to, and as illustrated by, the
Example.
6. A metal article having a substantially corrosion free surface
whenever manufactured by a method as claimed in any one
of the preceding Claims.
Dated this the 29th day of July 2002 TVS Motor Company Limited By Their Attorney

Documents:

0214-mas-2002 abstract-duplicate.pdf

0214-mas-2002 abstract.pdf

0214-mas-2002 claims-duplicate.pdf

0214-mas-2002 claims.pdf

0214-mas-2002 correspondence-others.pdf

0214-mas-2002 correspondence-po.pdf

0214-mas-2002 description (complete)-duplicate.pdf

0214-mas-2002 description (complete).pdf

0214-mas-2002 description (provisional)-duplicate.pdf

0214-mas-2002 description (provisional).pdf

0214-mas-2002 form-1.pdf

0214-mas-2002 form-19.pdf

0214-mas-2002 form-26.pdf

0214-mas-2002 form-3.pdf

0214-mas-2002 form-5.pdf

« Previous Patent

Next Patent »

Patent Number

202117

Indian Patent Application Number

214/MAS/2002

PG Journal Number

05/2007

Publication Date

02-Feb-2007

Grant Date

07-Sep-2006

Date of Filing

26-Mar-2002

Name of Patentee

M/S. TVS MOTOR COMPANY LIMITED

Applicant Address

JAYALAKSHMI ESTATES, #08, HADDOWS ROAD, CHENNAI 600 006

Inventors:

#	Inventor's Name	Inventor's Address
1	R VASANTH	TVS MOTOR COMPANY LIMITED, HARITA, HOSUR-635 109

PCT International Classification Number

C23C 2/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA