KR20140001017A - 8 karat gold alloys for tarnish resistant and various colors - Google Patents

8 karat gold alloys for tarnish resistant and various colors Download PDF

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KR20140001017A
KR20140001017A KR1020120069251A KR20120069251A KR20140001017A KR 20140001017 A KR20140001017 A KR 20140001017A KR 1020120069251 A KR1020120069251 A KR 1020120069251A KR 20120069251 A KR20120069251 A KR 20120069251A KR 20140001017 A KR20140001017 A KR 20140001017A
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gold
composition
alloy
gold alloy
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KR1020120069251A
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이기식
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주식회사 삼양귀금속거래소
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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
    • 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
    • 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
    • C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
    • 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
    • C22C30/06—Alloys containing less than 50% by weight of each constituent containing zinc
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/02—Alloys based on gold
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)

Abstract

The discoloration resistance and low carat gold alloy composition of the present invention is Au 33.34% by weight, Ag 10-20%, Cu 30-50%, Zn 5-15%, Pd 0.5 It consists of -3.0 weight%, Ir 0.01-0.2 weight%, Rh 0.01-0.1 weight%, Ru 0.01-0.1 weight%, Ge or Nd 0.01-0.50 weight%, and an unavoidable impurity. In the case of a white-based gold alloy, Au 33..34% by weight, Ag 20-40% by weight, Cu 5-10% by weight, Zn 20-30% by weight, Pd 1.0-30% by weight, Ir 0.01-0.2% by weight, 0.01 to 0.1 wt% Rh, 0.01 to 0.1 wt% Ru, 0.01 to 0.50 wt% Ge or Nd, and unavoidable impurities. In the case of the pink-based gold alloy, Au 33.34%, Ag 10-20%, Cu 40-60%, Zn 1-5%, Pd 0.5-3.0%, Ir 0.01-0.2%, Rh 0.01- 0.1 weight%, 0.01 to 0.1 weight% Ru, 0.01 to 0.50 weight% Ge or Nd, and unavoidable impurities.
In the production of gold alloys of various colors, using a vacuum high-frequency melting furnace to control the melting atmosphere with a vacuum or argon gas to produce a gold alloy by actively inhibiting the oxidation of volatile base metals such as Zn, and the alloy ingot After annealing by heat treatment at high temperature and cold rolling, it is produced as flake plate or granule.

Description

8 karat gold alloys for tarnish resistant and various colors}

The present invention relates to a composition of a gold alloy for ornaments of various colors having a low carat (8K) having a relatively low gold content and excellent discoloration resistance, and a method of manufacturing the same.

Generally, 14 carat or more gold having a gold content of 58.33% is commonly used as a gold alloy for gold ornaments. However, in recent years, due to the sharp rise in the price of precious metals such as gold, silver or platinum group metals, the use of these precious metals, especially gold, in alloys for jewelry is extremely limited. Therefore, there is an urgent need to develop a new gold alloy with low gold content (10K, Au 41.67% or less) and its discoloration resistance, corrosion resistance, castability, processability, and color are similar to or better than 14 carat gold alloy. to be. In general, when the gold content is low, there is a problem that the color and discoloration resistance is reduced.

The research on low-carat gold alloys with low gold content is very limited, and the results of the previous research and development show that U.S. Patent 4,264,359 shows Au 25%, 11.75-12.6% Pd, Zn 8.9-10.25%, and B 0.04-0.65%. The remainder is disclosed for a gold gold alloy composed of Cu and unavoidable impurities. However, the Pd content is relatively too high, resulting in poor workability and economical issues such as price. In another example, U.S. Patent 4,370,164 has 4 to 10% Au, 54 to 61% Ag, 14 to 19% Cu, and 4 to 7% Pd. , In 9 ~ 14%, Zn 1 ~ 3%, B 0.015 ~ 0.04%, the color is gold color, but the hardness of alloy is high and weak due to the formation of intermetallic compound of palladium and indium. There is a disadvantage in that the cracking phenomenon occurs and workability is poor. U.S. Patent 5,429,975 discloses gold gold alloys with Au 41.7%, Ag 12-13%, Cu 40-41.5%, Zn 4.5-5.5%. The gold alloy of dual composition shows the color of 14K gold alloy, but has a weak color resistance.

In addition, the white-based low-carat gold alloy is disclosed in Japanese Patent Laid-Open No. 2007-277685, which is Au 20.8%, Ag 40-55%, Cu 5-25%, Pd 8-28%, Zn and Sn 0.5-5.0% The composition of the carat-white gold alloy is disclosed, and for the pink-based gold alloy, Au 37.5-50.0%, Ag 6%, Cu 48-62.5%, In 6.0%, Ge and PCT patent WO 2008/146540. A low carat gold alloy with In 0.02% to 3.0% is disclosed. In general, white-based gold alloys used to produce white by adding Ni, which is relatively inexpensive, but Ni is not used in decorative products that touch the skin because Ni causes allergic phenomena to the skin. Therefore, as described above, white is expressed using Ag or Pd, which is relatively expensive, and in the pink-based alloy, color is controlled by changing the amount of Cu added. Therefore, in order to form a white gold alloy using low carat gold, it is necessary to increase the use of relatively expensive Ag or Pd, which causes a problem in cost increase. The red color of this Cu often floats, resulting in a decrease in aesthetics and discoloration resistance of the product.

Therefore, it is necessary to solve the problems arising in the above-described invention and to develop a multi-color gold alloy while having a low carat (8K) having excellent physical properties.

US 4,264,359, April 28, 1981. US 4,370,164, 1983. 25 January. US 5,429,975, 1995. 6. 4. Japanese Patent Laid-Open No. 2007-277685, Oct. 25, 2007. WO2008 / 146540, December 4, 2008

Li Baomian, Color Characteristics fo Cu-Zn-Al alloys, Transaction of NFsoc, vol. 4, No. 3, Sep. 1994.

An object of the present invention is to solve the problems described above to fix the gold content of 8 carats (33.34% Au) and other alloy elements [Ag, Cu, Zn, Pd, Ir, Ge, and rare earth metals (Ce , La, Y, Nd, Sm, Pr, etc.), etc.), and the color alloy (golden, white, and pink, etc.), discoloration resistance, processability and hardness are the same or better gold alloy than 14K gold alloy. It is to provide a composition and alloying method of decorative low-carat (8K) gold alloy, such as rings, necklaces, earrings.

In order to achieve the above object, the manufacturing method of the discoloration resistance and low carat gold alloy according to the present invention has a gold content of 8K (33.34% Au) and other alloying elements are Ag, Cu, Zn, Pd, Ir, Rh, Ru , Ge, and rare earth metals (Ce, La, Y, Nd, Sm, Pr and the like).

Another object of the present invention is to adjust the composition ratio of Ag, Cu, and Zn to adjust the color of the gold alloy in the case of gold lightness (L) is 88.21, saturation (a, b) is a = 1.22, b = 21.85, the color hue (L) is 92.92, the color saturation (a, b) is a = -1.88, b = 9.26, the color luminosity (L) is 85.00, the saturation (a, b) ) Constitutes a gold alloy composition approaching a = 7.70 and b = 15.20. (See Non-Patent Document.)

Another object of the present invention is composed of Ag, Cu, Zn, and Pd as the main alloy elements other than gold to adjust the gold, white, or pink color, and as an element for hardness, particle refinement and discoloration resistance, Ir, Ru, When a small amount of Rh, Ge and rare earth metals (Ce, La, Y, Nd, Sm, Pr, etc.) are added to adjust the physical properties, cracks occur on both sides when the hardness is 150 to 200 VH and rolled to about 1.0 mm or less. It provides a process for producing a gold alloy characterized in that the workability does not have a discoloration after 72 hours immersion in 0.1% Na 2 S solution or 10% H 2 SO 4 solution.

Therefore, the composition of the discoloration resistance and low carat (8K) gold gold alloy according to the present invention is Au 33.34% by weight, Ag 10-20% by weight, Cu 30-50% by weight, Zn 5-15% by weight, Pd 0.5-3.0 Weight%, 0.01 to 0.2 weight%, 0.01 to 0.1 weight% Rh, 0.01 to 0.1 weight% Ru, 0.01 to 0.50 weight% Nd or Ge, and inevitable impurities.

In addition, the composition of the discoloration resistance and 8-carat white gold alloy according to the present invention is Au 33..34% by weight, Ag 20-40% by weight, Cu 5-10% by weight, Zn 20-30% by weight, Pd 1.0- 30 weight%, 0.01 to 0.2 weight% Ir, 0.01 to 0.1 weight% Rh, 0.01 to 0.1 weight% Ru, 0.01 to 0.50 weight% Nd or Ge, and inevitable impurities.

In addition, the composition of the discoloration resistance and 8 carat pink gold alloy according to the present invention is Au 33.34% by weight, Ag 10-20% by weight, Cu 40-60% by weight, Zn 1-5% by weight, Pd 0.5-3.0% by weight, It is characterized by consisting of 0.01 to 0.2 wt% Ir, 0.01 to 0.1 wt% Rh, 0.01 to 0.1 wt% Ru, 0.01 to 0.50 wt% Nd or Ge and unavoidable impurities.

Another object of the present invention is to use a vacuum high-frequency melting furnace to prepare a multi-color gold alloy having the above-described composition and performance and to control the melting atmosphere to a vacuum or argon atmosphere to oxidize volatile base metals such as Zn. It is characterized by producing a gold alloy by actively suppressing the.

Another object of the present invention is to heat-treat the above-described gold alloy ingot at high temperature to anneal and then cold rolled to produce a sheet-like product of flakes.

Still another object of the present invention is to melt the above-mentioned gold alloy ingot by heating and melting 100-300 ° C. higher than the melting point of the alloy in a high-frequency melting furnace, and dropping the water through a nozzle just above the water surface while rotating the water in the water tank. It is characterized by producing a granule-shaped product of ˜5 mm.

The present invention can provide a composition and alloying method of the gold alloy for jewelry decoration having the above constituents and having the same color as the conventional 14K gold alloy, low price, excellent discoloration resistance and aesthetics. In addition, it is possible to provide a composition of a gold alloy having excellent workability and a method for producing the alloy by solving various problems such as deoxidation, sulfidation resistance, fluidity, and crack generation during casting of the gold alloy.

The above solutions and objects of the present invention and other various features will be described in more detail.

It is composed of Ag, Cu, Zn, Pd as main alloy elements other than gold, and various colors are adjusted. Ir, Ru, Rh, Ge and rare earth metals (Ce, La, Y, Nd, Sm, Pr, etc.) as trace elements By adding a small amount of light to adjust the physical properties such as crystallization, deoxidation, and casting improvement, cracks on both sides when the hardness is about 150 to 200 VH and the thickness is about 1/15 or less (0.5 to 1.0 mm) when casting It has a processability that does not occur and provides a method for producing a multi-color gold alloy, characterized in that it does not discolor even after immersion for 72 hours in dilute sulfuric acid (10% H 2 SO 4 ) or sodium sulfide (0.1% Na 2 S) solution. do.

In the case of the gold alloy, Pd is known to play a role of improving the discoloration resistance and mechanical strength, but in the present invention, the effect is weak at the addition of 0.5% or less and the mechanical strength is too high when exceeding 3.0% to the side during rolling Cracking phenomenon occurs. Therefore, the most preferable addition range is 1 to 2.5%.

Cu is known as an element that controls the color control and heat treatment curability of gold alloys, but it is difficult to express the color of gold at less than 30%, and when it is added more than 50%, there is a problem of lack of gold retention and discoloration resistance. A range of addition of% is suitable.

Zn is not only deoxidation effect during melt casting but also color control element such as Cu, it is difficult to express color at below 5%, and color and processability deteriorate at above 15%. Do.

Ag is an essential element in controlling the properties of castability and processability in the gold alloy composition like Cu and Zn, and casting and workability are less than 15%, and when it exceeds 40%, the color becomes light and discoloration resistance is reduced. In the present invention, the range of 15 to 40% is suitable.

On the other hand, in the gold alloy of the white system, a relatively large amount of Ag, Zn, Pd content is added for white expression. When the Pd content is over 15%, the hardness increases and the cost increases, so it is appropriately controlled. Ag expresses white by adjusting within 20 to 40% and Zn within 20 to 30%.

On the other hand, in the pink gold alloy, the content of Cu tends to increase relatively, so the lack of discoloration resistance is a problem, but it is controlled to overcome this by the addition of platinum group metals such as Pd, Ir, Rh, and Ru.

In addition, as trace elements, Ir, Rh, Ru, Ge, and rare earth metals are known as elements that improve crystal refinement, deoxidation effect during melt casting, and mechanical strength, but are less effective at 0.01% and less than 0.5%. At the time of brittleness, there is a disadvantage in that workability becomes large and the optimum addition range is 0.01 to 0.5%.

Therefore, the discoloration resistance and low carat gold-based gold alloy composition of the present invention is Au 33.34% by weight, Ag 10-20% by weight, Cu 30-50% by weight, Zn 5-15% by weight, Pd 0.5-3.0% by weight , 0.01 to 0.2 wt% Ir, 0.01 to 0.1 wt% Ru, 0.01 to 0.1 wt% Rh, 0.01 to 0.50 wt% Ge or Nd, and unavoidable impurities.

In addition, the composition of the discoloration resistance and low-carat white gold alloy according to the present invention is Au 33..34% by weight, Ag 20-40% by weight, Cu 5-10% by weight, Zn 20-30% by weight, Pd 1.0- 30 wt%, 0.01 to 0.2 wt% Ir, 0.01 to 0.1 wt% Rh, 0.01 to 0.1 wt% Ru, 0.01 to 0.50 wt% Si or Ge or Nd and unavoidable impurities.

In addition, the composition of the discoloration resistance and low-carat pink-based gold alloy according to the present invention is Au 33.34% by weight, Ag 10-20% by weight, Cu 40-60% by weight, Zn 1-5% by weight, Pd 0.5-3.0% by weight , 0.01 to 0.2 wt% Ir, 0.01 to 0.1 wt% Rh, 0.01 to 0.1 wt% Ru, 0.01 to 0.50 wt% Ge or Nd, and unavoidable impurities.

Another object of the present invention is to use a vacuum high frequency melting furnace to produce a gold alloy having the above composition and performance and to control the melting atmosphere to a vacuum or argon gas atmosphere to actively inhibit the oxidation of volatile base metals such as Zn. Cast a gold alloy to produce a plate or granule.

First, the alloy process is laying the Zn-volatile large base metal in a graphite crucible on top to the bottom that Cu, Ag, and platinum group metal into a (Pd, Ir, Ru, Rh, etc.) and Ge, Nd and so on of about 10 -2 torr After injecting an appropriate amount of argon gas and heating it to about 1200 ℃, the alloying elements are completely melted and rotated and mixed to keep the alloy completely formed, and then to a graphite mold heated to about 200 ℃ in a certain form. Quench casting to produce ingots of any shape. Zn may manufacture and use Cu and a mother alloy.

Secondly, the processing of the ingot is annealed by heating the cast ingot for 10 to 20 minutes at 750 ℃ and then cold-rolled to a thickness of about 0.5 to 1mm to manufacture a product of 10x10x (0.5 to 1.0) mm plate.

Third, the other process of the above-mentioned ingot is heated and melted again in the high frequency melting furnace 100 ~ 300 ℃ higher than the melting point of the alloy, and dropped into the water tank through a nozzle of about 1 mm in diameter to about 2 to 5 The product is produced in the form of granules having a size of mm. At this time, the water in the water tank is reduced in surface tension by adding alcohol, etc., and the molten metal is dropped on the rotating disk made of ceramic, which rotates at about 5 cm from the top of the water while rotating in a predetermined direction with a motor, etc. A relatively uniform spherical granule of ˜5 mm is prepared.

In the investigation of the physical properties of the alloy product, the hardness is measured by a Vickers hardness tester after cutting the 1 mm thick plate into 10 × 10 mm size, heating at about 700 ° C. for 10 minutes, quenching in water, and then softening.

Discoloration test is to put the 1mm thick plate or spherical granules in 0.1% Na 2 S aqueous solution or 10% H 2 SO 4 aqueous solution to investigate the color change after 72 hours at room temperature (25 ℃).

Through the following examples will be described in detail with respect to the production of the alloy according to the composition change of the gold alloy of each color.

Table 1 shows the results of the composition composition and physical properties of the gold gold alloy according to the composition of alloy elements other than gold.

 Gold series gold alloy Component (% by weight) Hardness VH ※ discoloration Au Ag Cu Zn Pd Ir Ru Rh Ge (Nd) Example 1 33.34 18.29 39.98 5.84 2.50 0.05 - - - 187 Not Example 2 " 16.87 40.88 6.85 2.00 - 0.06 - - 180 " Example 3 " 15.84 42.75 7.00 1.00 - - 0.07 - 156 " Example 4 " 13.33 43.99 7.84 1.50 0.08 - - - 170 " Example 5 " 11.80 49.76 4.50 0.50 - - - 0.10 (Ge) 163 " Example 6 " 6.65 51.89 6.56 1.50 - - - 0.06 (Nd) 173 " Comparative Example 1 " 14.43 44.00 8.23 - - - - - 130 discoloration Comparative Example 2 " 11.99 48.78 5.89 - - - - - 147 "

※ 0.1% Na 2 S solution or a 72 hours immersion in 10% H 2 SO 4 solution at room temperature (25 ℃)

As can be seen from this table, the gold alloy in the embodiment of the present invention has excellent discoloration resistance even at a gold content of 8K (33.34%), and has 14K (58.38%) gold in castability, hardness, plasticity and color. It is similar to that of the alloy.

Table 2 shows the results of the composition ratio and physical properties of the white-based gold alloy.

 White series gold alloy Component (% by weight) Hardness VH ※ discoloration Au Ag Cu Zn Pd Ir Ru Rh Ge (Nd) Example 1 33.34 26.72 5.00 25.89 9.00 0.05 - - - 190 Not Example 2 " 21.88 5.00 26.17 13.55 - 0.06 - - 210 " Example 3 " 25.77 5.88 24.94 10.00 - - 0.07 - 198 " Example 4 " 30.00 6.00 24.06 6.50 0.10 - - - 189 " Example 5 " 35.98 8.90 16.68 5.00 - - - 0.10 (Ge) 177 " Example 6 " 39.76 10.00 14.85 2.00 - - - 0.05 (Nd) 170 " Comparative Example 1 " 25.00 6.00 35.66 - - - - - 157 discoloration Comparative Example 2 " 34.66 8.00 24.00 - - - - - 148 "

The white gold alloy also has excellent discoloration resistance and relatively high hardness compared to the gold gold alloy. This is considered to be the effect of Pd. The color is white with pale yellow color.

Table 3 shows the results of the composition composition ratio and physical properties of the gold-based gold alloy. In this table, the hardness is similar to that of gold-based gold alloys, and the product of the example shows a pink color with a Cu color without discoloration.

 Pink series gold alloy Component (% by weight) Hardness VH ※ discoloration Au Ag Cu Zn Pd Ir Ru Rh Ge (Nd) Example 1 33.34 10.90 48.71 5.50 1.50 0.05 168 Not Example 2 " 13.60 50.00 1.00 2.00 0.06 175 " Example 3 " 15.00 46.59 2.50 2.50 0.07 177 " Example 4 " 17.75 42.81 3.00 3.00 0.10 180 " Example 5 " 18.99 44.57 2.00 1.00 0.10 (Ge) 158 " Example 6 " 20.00 45.39 1.00 1.00 0.05 (Nd) 160 " Comparative Example 1 " 10.00 51.16 5.5 - - - - - 157 discoloration Comparative Example 2 " 15.00 49.16 2.5 - - - - - 160 "

Claims (5)

As a composition of the discoloration resistance and 8 carat gold-based gold alloy,
Au 33.34%, Ag 10-20%, Cu 30-50%, Zn 5-15%, Pd 0.5-3.0%, Ir 0.01-0.2%, Ru 0.01-0.1%, Rh 0.01- A composition of discoloration resistance and gold-based 8 carat gold alloy, comprising 0.1% by weight, Ge or Nd of 0.01 to 0.50% by weight, and unavoidable impurities.  As a composition of 8-carat white gold alloy, Au 33.34 wt%, Ag 20-40 wt%, Cu 5-10 wt%, Zn 20-30 wt%, Pd 1.0-30 wt%, Ir 0.01-0.2 wt%, Rh A composition of a white-based 8-carat gold alloy comprising 0.01 to 0.1% by weight, 0.01 to 0.1% by weight of Ru, 0.01 to 0.50% by weight of Si or Ge or Nd and inevitable impurities. As a composition of 8-carat pink gold alloy, Au 33.34%, Ag 10-20%, Cu 40-60%, Zn 1-5%, Pd 0.5-3.0%, Ir 0.01-0.2%, A pink-based 8-carat gold alloy composition comprising 0.01 to 0.1 wt% Rh, 0.01 to 0.1 wt% Ru, 0.01 to 0.50 wt% Si or Ge or Nd, and unavoidable impurities. The method according to any one of claims 1 to 3, wherein
In the alloying process, Zn, a highly volatile base metal, is laid on the bottom of a graphite crucible, and Cu, Ag, and platinum group metals (Pd, Ir, Ru, Rh, etc.) and Ge or Nd are put in a vacuum of about 10 -2 torr or less. After argon gas is injected again and heated to about 1200 ° C., the alloying elements are sufficiently melted and rotated and mixed to maintain the alloy to be completely formed, followed by quench casting in a predetermined form on the graphite mold heated to about 200 ° C. A composition of 8 carat gold alloys.
The method according to claim 4, wherein the cast ingot is heated and annealed at 750 ° C. for 10 to 20 minutes and cold rolled to a thickness of about 0.5 to 1 mm to prepare a product in the form of a 10 × 10 × (0.5 to 1.0) mm sheet, or the ingot is oxygenated again. In the torch or high frequency melting furnace, the product is heated and melted 100 ~ 300 ℃ higher than the melting point of the alloy and dropped into the water tank through a nozzle of about 1 mm in diameter to produce a product in the form of granules having a diameter of about 2 to 5 mm. A composition of 8 carat gold alloys.
KR1020120069251A 2012-06-27 2012-06-27 8 karat gold alloys for tarnish resistant and various colors KR20140001017A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800004442A1 (en) * 2018-04-12 2019-10-12 GOLD ALLOY RESISTANT TO TARNISHING, IN PARTICULAR TO 9K AND PRODUCTION METHOD OF THE SAME
WO2019198042A1 (en) * 2018-04-12 2019-10-17 Argor - Heraeus Sa Tarnishing resistant copper gold alloy, in particular 9k, and method for production thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800004442A1 (en) * 2018-04-12 2019-10-12 GOLD ALLOY RESISTANT TO TARNISHING, IN PARTICULAR TO 9K AND PRODUCTION METHOD OF THE SAME
WO2019198042A1 (en) * 2018-04-12 2019-10-17 Argor - Heraeus Sa Tarnishing resistant copper gold alloy, in particular 9k, and method for production thereof

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