fIELD OF INVENTION:
[001] The present invention relates to the field of antique silver finish. The present
invention in particular relates to a method for antique or aged finish in silver using
gradual oxidation
5 DESCRIPTION OF THE RELATED ART:
[002] Demand to metal decoration, sometimes requires rich in color gorgeous,
beautiful, and sometimes user can ~lso have spy to product Different requirement,
especially under certain special environment, some metal decorations must more
seem aesthetic feeling in the case where doing old, because This just needs to carry
10 out decorative product under such conditions to do old processing. existing to do
old processing and need by many road works Sequence, this makes the cost of this
treatment process very high, and effect is undesirable, and surface color and polish
is more stiff.
[003] Such as patent name : Old treatment process is done on a kind of surface of
15 decoration metal product ; The patent No. 11 201410160109. I 11 propose through
spray yam, immersion liquid, wipe, do the formalities such as old. surface
protection, drying, the technical solution Complex process and spray yam can be to
working environment be influenced, most important product effect is unobvious.
20
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[004] Another Silver Jewelry manufacture craft : Silver paste carries out mold
molding, and black, local de-black is done in vulcanization, then is thrown with
polishing machine Light ; This technique has a disadvantage that : I silver paste
forms the high 2 polishing machine polishing of relative cost and generates dust
influence environment, and product coarse It is rough.
[005] Reference may be made to the following:
[006] Publication No. CN108819597 relates to an antique finish technology of
metal accessories for decoration. The technology comprises a series of flows of pre-
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treating through a mold, carrying out mold pressing, vulcanizing, removing a black
surface, carrying out mold pressing again, carrying out brightness and glossiness
and abrasion repairing and the like. According to the antique finish technology, an
existing silver paste curing and molding and trimming technology is replaced with
5 a mold oil-pressing technology; a technological flow is simple and the operation is
also simple; a working environment is optimized and the most important product
effect is also better.
[007] Publication No. W020 14165867 relates to silver and tin alloy electroplating
baths include complexing agents which enable the electroplating of either silver
10 rich or tin rich alloys. The silver and tin alloy electroplating baths are substantially
free of lead. They may be used to electroplate silver and tin alloys in the
manufacture of electronic components such as electrical connectors, finishing
layers for metallic substrates, decorative applications and solder bumps.
[008] Publication No. CNI09606001 relates to an antique-finish agent for a
15 production process for silver-inlaid black copper, and a use method thereof. The
antique-finish agent is composed of the following components in parts by mass:
150-250 parts of sulfur soap, 80-130 parts of urea and 800-1200 parts of water. The
mixture is heated to reach 80-100 DEG C, then a part to be subjected to antiquefinish
treatment is coated with the mixture, and coated again after 5-10 minutes,
20 coating is carried out for 2-3 times, and standing is carried out for 20-40 minutes,
so that an antique-fmish effect is presented. The antique-finish agent enables silverinlaid
black copper to achieve an overall exquisite effect.
[009] Publication No. JPH02145400 relates to a heavy and thick decoration
material by partly coating a gold foil with silver powder, then thermally pressing it
25 through a cloth impregnated with sulfur to provide the atmosphere equivalent to
antique gold. Then, an iron in which cloth impregnated with sulfur is applied to the
pressurizing face is heated to 130-150 deg.C, and thermally pressed. In this case,
the powder 4 on the foil 3 is sequentially discolored from silver color to pale gold
color, brown color, blue purple, blue by converting to sulfide, and most is adhered
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to impregnated sulfur. The face of the foil 3 is partly made sulfided gold by the
catalytic action of the powder 4, discolored to gold brown. In case of the gold foil
containing more silver is discolored to blue, and in the other case, it is discolored
to red purple. It is further formed with a top coating layer 5 thereon.
5 [010] Publication No. GB 1264135 relates to a decorative finish on a smooth nonporous
substrate surface is produced by applying a coating of a coloured hardener
for an unsaturated polyester resin, allowing the coating to dry, applying in a pattern
a solution of silicone gum dispersed in a solvent or in a polyester lacquer, allowing
the surface to dry and thereafter applying an over-all coating of an unsaturated
10 polyester resin lacquer and allowing the lacquer coated surface to dry in a dust-free
atmosphere. The polyester resin component of the lacquer is an unsaturated
polyester formed from polyhydric alcohols and unsaturated di-basic acids or
anhydrides dissolved in a polymerisable vinyl monomer, e.g. styrene. The
unsaturated polyester resin lacquer may contain metal powder. Antique beaten
15 metal effects or ceramic tile effects can be produced.
[011] Publication No. US6800 190 relates to aqueous compositions and methods to
produce durable and vitreous colored interference films of nickel zinc oxide
electroplating, including white zinc metallic colored electro depositions for the zinc
embodiment; brass, bronze, burgundy, purple, blue, green and black electroplatings
20 covering both high and low bath concentration embodiments. The films are useful
for decorative and functional purposes. The distinguishing features of the coating
are its vivid colorfulnc""· its specular reflection and the perception of binocular
depth by the observer caused by translucence of the deposited film. The baths can
coat a variety of metal substrates, including brass, copper and most ferrous metals.
25 [012] Publication No. US2008050608 relates to a process for coating a metal part
with a magnetron-sputtered material to provide corrosion protection. The process
results in a part having a uniform coating. Coating materials include corrosion
resistant zinc with various options for appearances and levels or corrosion
protection.
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[013] Publication No. US2009139264 relates to a gold plated jewelry article that
has an antique, ancient or aged appearance and methods of making the same. The
method includes providing a matte finish on an engravable article having a desired
shape and being made of a metal or alloy that is less precious than gold; plating all
5 visible surfaces of the engravable article with a thin layer of gold; and engraving
characters on at least one surface of the engravable article.
[014] The article entitled "Electroplating & metal fmishing technology" by Cecri,
2012 talks about the technology for electroplating of trivalent chromium and hard
chrome: We have developed electroplating of chromium from both hexavalent and
10 trivalent baths on various substrates and components. As hexavalent chromium is
going to be banned internationally in near future, our trivalent Cr plating has a
great potential to cater the aviation and automobile industries. : Electrochemical
oxidation of metal surface to yield corrosion resistant, high hardness and pleasing
appearance.
15 [015] The article entitled "Electroplating for decorative applications: recent trends
in research and development" by Walter Giurlani, Giovarmi Zangari, Filippo
Gambinossi, Maurizio Passaponti, Emanuele Salvietti, Francesco Di Benedetto,
Stefano Caporali and Massimo Innocenti, Coatings , 8(8), 260, 2018 talks about
the electroplating processes are widely employed in industrial environments for a
20 large variety of metallic coatings, ranging from technological to decorative
applications. Even if the galvanic electrode position is certainly a mature
technology, new concepts, novel applications, environmental legislation and the
new material requirements for next-generation devices make the scientific research
in this field still very active. The demand for durable metals and adaptable
25 manufacturing processes are needed across a wide range of applications, from
automotive and aerospace to jewelry and machinery. The production of metallic
coatings involves electrochemical reactions at the electrode/electrolyte interface,
which lead to the deposition of ions from the solution to the electrodic surface with
the electron transfer .
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[016] The article entitled "Electroplating" by AI Ansari Group, 2019 talks about the
electrophoretic Lacquer coating process uses an Electrical current to deposit
lacquer, which is an advanced mixed formula of Polyurethance (PU) and Acrylic
resin, on metal substrates such as Aluminium, Copper, Gold, Silver, Brass, Zinc
5 Rich Metals, die cast metals, Mazak Zamac, Zamak, Galvanized /Galvanic
Stainless Steel etc. Silver- Mirror Bright I Matt I Bright I Oxidized (Antique).
[017] The article entitled "Antique plating" by Spencer Electroplating, 2016 talks
about the antique finish can be applied to stainless steel, steel, zinc die-cast, brass,
ABS plastics and offers excellent performance. Spencer and spencer achieves this
10 finish by nickel, copper, gold, silver-plating an item and then blackening the item
with our black nickel process. Once this is done we relive the item to leave an
antique finish. As a final step we apply a clear coating to the item to preserve it.
The finish showed in the picture above is our standard color but we can produce
this finish in a wide range of shades.
15 [0181 The article entitled "Custom plating in gold, silver, rhodium, copper, nickel,
multicolor and antique finishing" by Reliable Electroplating, Inc., 1932 talks about
the reliable electroplating is a service company, specializing in metal fmishing.
Finishes include electroplating of gold, silver, nickel, copper and rhodium. We offer
both barrel and rack plating, providing functional industrial finishes, as well as
20 decorative and antique finishes. Additional value added services include polishing,
stripping, cleaning, pickling, bright dipping, mass finishing, de-burring, burnishing,
clear C(lating and lacquering.
25
[0191 Thus above said techniques has disadvantage silver paste forms the high
polishing machine polishing of relative cost and generates dust influence
environment. Hence needed a low cost antique silver finish method which is more
effective
[0201 In order to overcome above listed prior art, the present invention aims to
provide a method for antique or aged finish in silver using gradual oxidation .
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OBJECTS OF THE INVENTION:
[021] The principal object of the present invention is to provide a method for
antique or aged finish in silver using gradual oxidation.
[022] Another object of the present invention is to provide low cost and effective
5 antique silver finish method
SUMMARY OF THE INVENTION:
[023] The present invention relates to a method for achieving antique silver or aged
finish on Brass sheet using different plating. This finish of aantique silver is made
by blasting abrasive powder on brass sheet & combination of silver & gold plating.
10 The high pressure blasting of mixture of abrasive powder and water is done on the
surface of the brass plate to create a texture on the surface over dial.
[024] The special abrasive powder quality makes grain over the dial and dial looks
white due to grain. The silver plating is done for long duration makes it black spots
over white surface. Then the oxidization is achieved by applying gold plating at a
15 specific standard current and time.
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[025] The base is prepared with disc Poncage & manual Poncage with some alkaline
solution. Granular finish on the base is prepared by using sand blasting machine
with coarse grain of Standard size of 600-1000 microns grit size. After base
preparation, Galvanizing is done from nickel plating than silver plating in multiple
layers followed by the process of plating by galvanizing in the gold plating bath.
After plating, coating of Zapon final is done to protect the plating color and also
shining for better looks
BREIF DESCRIPTION OF THE INVENTION
[026] It is to be noted, however, that the appended drawings illustrate only
typical embodiments of this invention and are therefore not to be considered
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for limiting of its scope, for the invention may admit to other equally effective
embodiments.
[027] Figure 1 shows special finish of antique silver on wrist watch dial
DETAILED DESCRIPTION OF THE INVENTION:
5 [028] The present invention provides a method for antique or aged finish in silver
using different plating. This finish of aantique silver is made by blasting abrasive
powder & combination of silver & gold plating. The high pressure blasting of
mixture of abrasive powder and water is done on the surface on dial (brass sheet).
to create a texture on the surface over dial (brass sheet).
10 [029] The special abrasive powder quality makes grain over the dial (brass sheet).
The silver plating is done for long duration makes it black spots over white surface.
[030] The base is prepared with disc Poncage & manual Poncage with some alkaline
solution. Granular finish on the base is prepared by using sand blasting machine
with some coarse grain abrasive with grit size of ranging 600-1000 microns. After
15 base preparation nickel plating is done than thick silver plating and then finally the
gold plating bath. After plating, coating of Zapon fmal is done to achieve the
required finish.
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[031] The special finish of antique silver (Fig I) on wrist watch dial is achieved by
the following process.
1. Ultrasonic cleaning for cleaning oil and dust
2. Disc Poncage for cleaning the scratches and dents
3. Shiny Manual Poncage for creating shine
4. Sand Blasting Abrasive aluminium powder to create a grainy surface on
the dial.
5. Nickle plating Grey in color after plating
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6. Silver Plating White in color after plating
7. Gold plating antique color look after plating
8. Final Zapon Lacquer for protecting the color of plating
(032] Numerous modifications and adaptations of the system of the present
5 invention will be apparent to those skilled in the art, and thus it is intended by
the appended claims to cover all such modifications and adaptations which fall
within the true spirit and scope of this invention.

WE CLAIM:
l. A method for antique or aged finish in silver includes following steps:
a) Ultrasonic cleaning for cleaning oil and dust
b) Disc Poncage for cleaning the scratches and dents
c) Shiny Manual Poncage for creating shine
d) Sand Blasting Abrasive aluminium powder to create a grainy surface on
the dial.
e) Nickle plating Grey in color after plating
f) Silver Plating White in color after plating
g) Gold plating antique color look after plating
h) Final Zapon Lacquer for protecting the color of plating
2. The method for antique or aged finish in silver, as claimed in claim 1, wherein
the base is prepared with disc Poncage & manual Poncage with alkaline
solution.
3. The method for antique or aged finish in silver, as claimed in claim I, wherein
the granular finish on the base is prepared by using sand blasting machine with
some coarse grain abrasive grit size of 600-1000 microns, after base
preparation, nickel plating is done than thick silver plating and then finally gold
plating, after that coating of Zapon final is done to achiev