CN108796340A - A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique - Google Patents
A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique Download PDFInfo
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- CN108796340A CN108796340A CN201810943839.7A CN201810943839A CN108796340A CN 108796340 A CN108796340 A CN 108796340A CN 201810943839 A CN201810943839 A CN 201810943839A CN 108796340 A CN108796340 A CN 108796340A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/12—Oxidising using elemental oxygen or ozone
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Abstract
The invention discloses a kind of low silver alloy of corrosion-resistant purple of Tibetan silver jewellery low-density and its techniques.According to weight percent, the ingredient of the alloy is:Sr:0.8-1.2wt.%,Mo:0.3-0.5wt.%,W:0.2-0.4wt.%,B:0.2-0.3wt.%,Y:0.6-0.8wt.%,Al:20.0-25.0wt.%,Ag:29.0-31.0wt.%, surplus are copper.The material provides a kind of light-weighted selection scheme for China's Tibetan silver alloy, and products obtained therefrom not only has excellent purple perception, and extremely hydrogen sulfide corrosion-resistant.The implementation and industrialization of the material can effectively push the demand of the update of China's jewellery industry product and industry upgrading.
Description
Technical field
The present invention relates to technical field of alloy, specifically, being related to a kind of silver alloy.
Background technology
Silver is the noble metal with silvery white non-ferrous metal, since the silver-colored characteristic of itself is very soft and alloying element formation, which is added, to be had
The silver alloy of excellent mechanical performance.Traditional decorations silver mainly has 3 kinds of trades mark:Fine silver, 958 silver medals and 925 silver medals, wherein 958 silver medals and 925
Silver is the bianry alloy constituted using copper as alloying element.The silver content of 958 silver alloy is high, silver content 95.8wt%, and 925
Silver-colored silver content is 92.5wt%.With the development of material science, the formula of silver alloy is also constantly updated, and is occurred number of types of
958 and 925 silver medals lead to various silver alloy chemically because the metallic element type, content, processing method of its addition are variant
It can be with mechanical property also some differences.Due to having carried out alloying and improved properties, silver alloy has ideal hardness and antioxygen
The property changed, and various jewels, diamond, jadeware and white stone can be inlayed.From this silver jewellery is bright and new with color and luster, style is unique, work
The fashion grade of skill fineness price middle-grade, the rapid fashionable whole world, becomes the leader of new generation of fashion world.
Other than the high silver alloy type of the above silver content, on the ground such as Tibet and Nepal, prevalence silver content is 30wt%'s
Silver alloy, commonly referred to as Tibetan silver.China national handicraft and tourist souvenir in the market, Tibetan silver jewellery and vessel at
For a popular substance label.It is occupied with the name manufacture of Tibetan silver, the assorted article merchandised, consumed rather considerable
The market share.All kinds of Tibetan silver ornaments, including ring, necklace, bracelet, loud, high-pitched sound crow box, amulet, hair band and some small-sized figures of buddha,
Oil lamp small cup, teacup bowls and chopsticks etc. account for nearly the 70% of its product category.
Tibetan silver is usually mutually to manufacture necklet with stone, and common is turquoise, corallite.Hide the mosaic technology ten of decorations
It is point superb, red coral, agate etc. can be often inlayed on Tibetan silver ornaments and is interspersed, it appears simple and unsophisticated rough.Their lines of outline can be
First view can intuitively embody the exclusive style of Tibetan, style and aesthetic feeling.Usually, they may inlay turquoise,
Coral, amber or crystal etc. are as decoration.Also, its common decorative motifs symbol, such as six word the truths, ten thousand characters, mostly
It is derived from the basic doctrine of Tibetan Buddhist.Tibetan silver in fact has become Tibetan culture quotient the most successful in travel in China market
One of product and Symbol of Culture symbol.
China metal surface process history is long, and manufacture skill is consummate, various in style, unique style.It is prepared using Tibetan silver
Jewellery and vessel, keep processing stage more and more finer.The progress of development and science and technology now with handicraft, uses tool
A variety of exploitations, the processing of ornaments is more and more exquisiter, on the basis of inheriting tradition in intension again have new expression.In conjunction with material
Matter itself the characteristics of, using process of surface treatment appropriate, impart the more appeal of Tibetan silver texture and expressive force.
Silver is readily generated a kind of extremely poorly soluble silver salt when encountering hydrogen sulfide gas or sulphion in air, silver is in sky
As long as meeting the hydrogen sulfide gas or sulphion of several trillion to tens part per trillion in gas, just vulcanization is produced in silver surface
Silver.Because silver sulfide is grey black, with the aggravation of reaction, silver sulfide, which increases, to be thickened, silver surface color just gradually by
The last blackening of leucismus xanthochromia ash.The source of Air Hydrogen Sulfide is a variety of.It is the excrement of humans and animals first by bacterium point
A large amount of hydrogen sulfide are generated after solution, and hydrogen sulfide is also generated after the protein corruption in plant.In addition also contain sulphur in the sweat of people,
It is more surprising by sewage and hydrogen sulfide caused by garbage emission especially in urban air.
But regrettably, there is no form abundant colour silver system as colored karat gold for Tibetan silver alloy at present
Row.Thus, silver jewellery in the market is white mostly, or the plated film coloured silk silver alloy for using the method for ion plating to obtain.It is this
The alloy of type does not have enough corrosion resistances after use and changes colour, or leaks out matrix alloy because of abrasion and make
Sulphide staining is obtained to accelerate.With the arrival of Tibetan silver jewellery storm in recent years, Tibetan silver ornaments sell well street corner, and demand dramatically increases.
In terms of the technology of processing of ornament, the Silver Jewelry factory in China has fairly horizontal, and if any representing, current international jewellery are newest
The hollow electrotyping forming of technique, 3 D stereo vehicle flower;There are the full-automatic chain assembly line processed of leading domestic jewellery technology, precision to lose and pour
Cast assembly line;Also a little fashion skills such as gold, sandblasting, color plating.And the Tibetan silver alloy product that the positive Devoting Major Efforts To Developing of domestic production man is new,
The inspection and challenge in market are met with brand and technology.
Invention content
The purpose of the present invention is to overcome the deficiency in the prior art, and it is low to provide a kind of corrosion-resistant purple of Tibetan silver jewellery low-density
Silver alloy and its technique.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique.By weight percentage, the composition of alloy
For Sr:0.8-1.2wt.%,Mo:0.3-0.5wt.%,W:0.2-0.4wt.%,B:0.2-0.3wt.%,Y:0.6-0.8wt.%,Al:
20.0-25.0wt.%,Ag:29.0-31.0wt.%, surplus are copper.
A kind of low silver alloy of above-mentioned corrosion-resistant purple of Tibetan silver jewellery low-density and its technique, include the following steps：It will be as
The raw material of upper proportioning is added in the electric induction furnace under ar gas environment, and uses graphite crucible;10 are kept the temperature when melting at 1200 degree
Minute, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute being kept the temperature at 1200 degree after stirring evenly and being cast come out of the stove;Alloy casting
Using the punching block of diameter 20-30mm, and cooled down by the way of water cooling.The ingot casting of gained is rolled at room temperature, per pass
It is secondary to roll lower amount for 20-30%;It is 450 degree per intermediate anneal temperature after rolling twice, keeps the temperature 0.8 hour;Finally material is rolled into
Thickness is the alloy sheets of 10-20mm;In jewellery forming process, needs to carry out vacuum annealing process, eliminate in process
Stress;Wherein, temperature is 440 degree, and the time is 0.5 hour；Finally during jewellery colour, need to carry out low-level oxidation behaviour
Make, 240 degree of temperature under atmospheric environment, the time is 0.5 hour.
Compared with prior art, the present invention has the advantages that：
（1）But regrettably, there is no form abundant colour silver system as colored karat gold for Tibetan silver alloy at present
Row.Thus, silver jewellery in the market is white mostly, or the plated film coloured silk silver alloy for using the method for ion plating to obtain.It is this
The alloy of type does not have enough corrosion resistances after use and changes colour, or leaks out matrix alloy because of abrasion and make
Sulphide staining is obtained to accelerate.With the arrival of Tibetan silver jewellery storm in recent years, Tibetan silver ornaments sell well street corner, and demand dramatically increases.
It is provided simultaneously with purple gloss and the Tibetan silver to fade with excellent resistance to vulcanization is not emerged with alloy.In addition, Tibetan people is in red-letter day
The whole body silver jeweleries contains, and ornaments exceed twenty or thirty jin again up to half people height, component mostly up to hundreds of.The complicated splendid attire silver of this whole body
Decorations carry abundant and lively Tibetan history and culture.Obviously, if low-density can be obtained and there is silver jewellery appearance and guarantor
It is worth the novel Tibetan silver alloy of performance, for promoting China's jewellery materials industry to quickly grow, improves the market pin of Related product
The amount of selling and usage experience accelerate such product and play very positive effect in the market occupancy volume of international scope.
（2）The material has excellent reuse performance.For casting ornament craft, casting technique yield rate generally compared with
It is low, the returns such as a large amount of running channel, waste product are will produce in production process.Jewellery enterprise is based on production cost and efficiency, always wishes
It hopes and uses returns as far as possible.Since alloy is in fusion process, can occur with not avoiding volatilization, oxidation, air-breathing the problems such as, because
This casts each time, and certain variation can all occur for the ingredient of alloy, influences the metallurgical quality and casting character of alloy.Alloy weight
The reuse performance of degradation problem and alloy itself during multiple use has substantial connection.The alloy of present patent application protection
Due to having carried out performance optimization, the fusing point of alloy is relatively low（810-830 degree）, chance that molten metal and casting mold react and
Degree smaller, and the anti-air-breathing oxidability of alloy is stronger, the degree of purity of molten metal improves, and improves the reuse performance of alloy.
The appearance profile that the alloy casts jewelry piece after 4 reuses is clear, and any surface finish illustrates alloy without apparent blackspot or discoloration
Reuse it is functional.Thus, the industrialization of the material can not only improve yield rate, can also be by multiple reuse significantly
Reduce production cost.
（3）Present patent application protection purple Tibetan silver alloy, hot-working and it is cold-formed after the alloy rolling or
Crystal grain is obviously whole in linear distribution by draw down, elongation after person's punching press.Alloy surface is not in crackle, the boundary of crystal grain
Cracking is there will not be, fabulous mecystasis is kept.Alloying element will not be in segregation in grain boundaries, and grain boundaries are intercrystalline
In conjunction with can be relatively strong, interface can be relatively low, thus has high plasticity, and elongation percentage can reach 50% or so.Thus add in pressure
It can be subjected to every time 30% or more deformation in work and be heat-treated without intermediate annealing.In addition, the material have it is excellent low close
Characteristic is spent, density maintains 8.1-8.3g/cm3, and the density of traditional Tibetan silver alloy is generally in 10.0g/cm3Left and right changes.Due to
Density is greatly reduced, silver jeweleries is contained, ornaments exceed twenty or thirty jin again up to half people height, component mostly up to hundreds of
People from Tibetan for, can achieve the effect that significantly to lower jewellery weight, at the same also have excellent value preserving performance.
（4）In addition, there is the silver alloy excellent corrosion resistance, anti-discoloration to have prodigious advantage.Corroding
In environment, the protective film of passivation can be formed, this film is in different media, since unpolarizing is as a result, to show
Go out different corrosion resistances, the corrosion resistance of strong acid, strong basicity sweat is also relatively stablized.The material constant temperature (35-38 degree),
Using salt air corrosion 100 hours in constant humidity (20-90%R.H.) chamber, remain to keep higher gloss degree and be basically unchanged color.?
Indoor environment, 4 years not turning black and changing colors substantially under conditions of atmospheric corrosion.And traditional Tibetan silver jewellery will after using 4 months
There is a phenomenon where apparent sulfide stainings.It is contemplated that the implementation and industrialization of the material will obtain excellent economic benefit.
Specific implementation mode
Embodiment 1
A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique.By weight percentage, the composition of alloy
For Sr:0.8wt.%,Mo:0.3wt.%,W:0.2wt.%,B:0.2wt.%,Y:0.6wt.%,Al:20.0wt.%,Ag:
29.0wt.%, surplus are copper.A kind of low silver alloy of above-mentioned corrosion-resistant purple of Tibetan silver jewellery low-density and its technique, including it is as follows
Step：As above the raw material matched is added in the electric induction furnace under ar gas environment, and uses graphite crucible;1200 when melting
Degree heat preservation 10 minutes, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute being kept the temperature at 1200 degree after stirring evenly and being cast come out of the stove;
Alloy casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.The ingot casting of gained is rolled at room temperature
System, it is 20-30% that every time, which rolls lower amount,;It is 450 degree per intermediate anneal temperature after rolling twice, keeps the temperature 0.8 hour;Finally by material
Material is rolled into the alloy sheets that thickness is 10-20mm;In jewellery forming process, needs to carry out vacuum annealing process, eliminate processing
Stress in the process;Wherein, temperature is 440 degree, and the time is 0.5 hour；Finally during jewellery colour, need to carry out micro-
Oxidation operation, 240 degree of temperature under atmospheric environment, time are 0.5 hour.
There is the material high plasticity, elongation percentage can reach 50% or so.It can be thus subjected in pressure processing every
The deformation of 30% or more passage and without intermediate annealing be heat-treated.In addition, the material has excellent low-density characteristic, density dimension
It holds in 8.1-8.3g/cm3, and the density of traditional Tibetan silver alloy is generally in 10.0g/cm3Left and right changes.It, can shape in corrosive environment
At the protective film of passivation, this film is in different media, since unpolarizing is as a result, to show different corrosion resistants
Corrosion energy also relatively stablizes the corrosion resistance of strong acid, strong basicity sweat.Environment indoors, 4 years bases under conditions of atmospheric corrosion
This not turning black and changing color.And traditional Tibetan silver jewellery will there is a phenomenon where apparent sulfide stainings after using 4 months.
Embodiment 2
A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique.By weight percentage, the composition of alloy
For Sr:1.2wt.%,Mo:0.5wt.%,W:0.4wt.%,B:0.3wt.%,Y:0.8wt.%,Al:25.0wt.%,Ag:
31.0wt.%, surplus are copper.A kind of low silver alloy of above-mentioned corrosion-resistant purple of Tibetan silver jewellery low-density and its technique, including it is as follows
Step：As above the raw material matched is added in the electric induction furnace under ar gas environment, and uses graphite crucible;1200 when melting
Degree heat preservation 10 minutes, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute being kept the temperature at 1200 degree after stirring evenly and being cast come out of the stove;
Alloy casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.The ingot casting of gained is rolled at room temperature
System, it is 20-30% that every time, which rolls lower amount,;It is 450 degree per intermediate anneal temperature after rolling twice, keeps the temperature 0.8 hour;Finally by material
Material is rolled into the alloy sheets that thickness is 10-20mm;In jewellery forming process, needs to carry out vacuum annealing process, eliminate processing
Stress in the process;Wherein, temperature is 440 degree, and the time is 0.5 hour；Finally during jewellery colour, need to carry out micro-
Oxidation operation, 240 degree of temperature under atmospheric environment, time are 0.5 hour.
There is the material high plasticity, elongation percentage can reach 50% or so.It can be thus subjected in pressure processing every
The deformation of 30% or more passage and without intermediate annealing be heat-treated.In addition, the material has excellent low-density characteristic, density dimension
It holds in 8.1-8.3g/cm3, and the density of traditional Tibetan silver alloy is generally in 10.0g/cm3Left and right changes.It, can shape in corrosive environment
At the protective film of passivation, this film is in different media, since unpolarizing is as a result, to show different corrosion resistants
Corrosion energy also relatively stablizes the corrosion resistance of strong acid, strong basicity sweat.Environment indoors, 4 years bases under conditions of atmospheric corrosion
This not turning black and changing color.And traditional Tibetan silver jewellery will there is a phenomenon where apparent sulfide stainings after using 4 months.
Embodiment 3
A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique.By weight percentage, the composition of alloy
For Sr:0.9wt.%,Mo:0.4wt.%,W:0.3wt.%,B:0.2wt.%,Y:0.7wt.%,Al:24.0wt.%,Ag:
29.0wt.%, surplus are copper.A kind of low silver alloy of above-mentioned corrosion-resistant purple of Tibetan silver jewellery low-density and its technique, including it is as follows
Step：As above the raw material matched is added in the electric induction furnace under ar gas environment, and uses graphite crucible;1200 when melting
Degree heat preservation 10 minutes, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute being kept the temperature at 1200 degree after stirring evenly and being cast come out of the stove;
Alloy casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.The ingot casting of gained is rolled at room temperature
System, it is 20-30% that every time, which rolls lower amount,;It is 450 degree per intermediate anneal temperature after rolling twice, keeps the temperature 0.8 hour;Finally by material
Material is rolled into the alloy sheets that thickness is 10-20mm;In jewellery forming process, needs to carry out vacuum annealing process, eliminate processing
Stress in the process;Wherein, temperature is 440 degree, and the time is 0.5 hour；Finally during jewellery colour, need to carry out micro-
Oxidation operation, 240 degree of temperature under atmospheric environment, time are 0.5 hour.
There is the material high plasticity, elongation percentage can reach 50% or so.It can be thus subjected in pressure processing every
The deformation of 30% or more passage and without intermediate annealing be heat-treated.In addition, the material has excellent low-density characteristic, density dimension
It holds in 8.1-8.3g/cm3, and the density of traditional Tibetan silver alloy is generally in 10.0g/cm3Left and right changes.It, can shape in corrosive environment
At the protective film of passivation, this film is in different media, since unpolarizing is as a result, to show different corrosion resistants
Corrosion energy also relatively stablizes the corrosion resistance of strong acid, strong basicity sweat.Environment indoors, 4 years bases under conditions of atmospheric corrosion
This not turning black and changing color.And traditional Tibetan silver jewellery will there is a phenomenon where apparent sulfide stainings after using 4 months.
Claims (3)
1. a kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique；According to weight percent, the alloy
Ingredient is:Sr:0.8-1.2wt.%,Mo:0.3-0.5wt.%,W:0.2-0.4wt.%,B:0.2-0.3wt.%,Y:0.6-
0.8wt.%,Al:20.0-
25.0wt.%,Ag:29.0-31.0wt.%, surplus are copper.
2. a kind of low silver alloy of corrosion-resistant purple of Tibetan silver jewellery low-density and its technique according to claim 1, feature
It is to include following smelting step：As above the raw material matched is added in the electric induction furnace under ar gas environment, and uses graphite
Crucible;10 minutes are kept the temperature at 1200 degree when melting, it is uniform by Efco-Northrup furnace electromagnetic agitation;It is kept the temperature at 1200 degree after stirring evenly
1 minute and cast come out of the stove;Alloy casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.
3. a kind of low silver alloy of corrosion-resistant purple of Tibetan silver jewellery low-density and its technique according to claim 1, feature
It is to use step comprising following：The ingot casting of gained is rolled at room temperature, it is 20-30% that every time, which rolls lower amount,;Per twice
Intermediate anneal temperature is 450 degree after rolling, keeps the temperature 0.8 hour;Material is finally rolled into the alloy sheets that thickness is 10-20mm;
In jewellery forming process, needs to carry out vacuum annealing process, eliminate the stress in process;Wherein, temperature is 440 degree,
Time is 0.5 hour；Finally during jewellery colour, need to carry out low-level oxidation operation, 240 degree of temperature under atmospheric environment,
Time is 0.5 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810943839.7A CN108796340A (en) | 2018-08-18 | 2018-08-18 | A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810943839.7A CN108796340A (en) | 2018-08-18 | 2018-08-18 | A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108796340A true CN108796340A (en) | 2018-11-13 |
Family
ID=64080407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810943839.7A Withdrawn CN108796340A (en) | 2018-08-18 | 2018-08-18 | A kind of low silver alloy of the corrosion-resistant purple of Tibetan silver jewellery low-density and its technique |
Country Status (1)
| Country | Link |
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| CN (1) | CN108796340A (en) |
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2018
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Application publication date: 20181113 |
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