Champagne gold alloy target material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of non-ferrous metals, and provides a champagne gold alloy target as well as a preparation method and application thereof. The champagne gold alloy target material provided by the invention is prepared from the following chemical components in percentage by mass: 96 percent to 99 percent of Au, 0.5 percent to 2.4 percent of Fe, 0.3 percent to 0.8 percent of Ag, 0.1 percent to 0.5 percent of In, 0.08 percent to 0.26 percent of Zn, 0.01 percent to 0.02 percent of Nd and 0.01 percent to 0.02 percent of Si. The champagne gold alloy target material is attractive in color and excellent in oxidation resistance and corrosion resistance, the L value of a film plated by the champagne gold alloy target material ranges from 87.2 to 88.5, the a value ranges from 1.3 to 6.4, the b value ranges from 20.4 to 34.2, the champagne gold alloy target material does not change color in an artificial sweat test for 360-432 h, the champagne gold alloy target material does not change color in a salt spray test for 240-360 h, market requirements can be met, and the champagne gold alloy target material is wide in application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of nonferrous metals, and in particular to a champagne gold alloy target material, a preparation method thereof, and applications thereof. Background Art

[0002] Champagne gold offers a soft golden hue similar to champagne, with a hue somewhere between the deep yellow and light gold of pure gold, with hints of warm orange or beige. This creates a visually elegant and stylish look, in line with modern decorative aesthetics. With the increasing emphasis on design in the consumer electronics and luxury goods industries, traditional pure gold plating, due to its high cost and low hardness, is being replaced by gold alloys. As a color that combines luxury with value, champagne gold continues to see growing market demand.

[0003] The surface of mobile phone casings, tablet computer frames, smart watch cases, etc. is plated with a champagne gold film to enhance the texture and fashion sense of the product. In the decoration industry, champagne gold replaces pure gold for the electroplating of necklaces, rings, bracelets and other accessories, which can reduce costs while maintaining the golden appearance. At present, the preparation method of surface gold-based materials has gradually transitioned from the traditional water-plating electroplating gold alloy product process to the advanced vacuum magnetron sputtering coating technology. Compared with electroplating, sputtering coating has the advantages of uniform film layer, strong adhesion, and environmental protection (no electroplating waste liquid). Therefore, the development of champagne gold alloy target materials can not only meet the needs of the market, but also effectively promote the application of alloy targets in related fields.

[0004] However, the current state of the art in developing champagne gold alloy targets still has some shortcomings. Existing champagne gold alloy targets have a single color, and the resulting films need improvement in oxidation and corrosion resistance, failing to fully meet market demand for higher-quality champagne gold films. Therefore, developing a champagne gold alloy target with superior oxidation and corrosion resistance, and a more aesthetically pleasing color, has become a pressing technical challenge. Summary of the Invention

[0005] In view of this, the present invention provides a champagne gold alloy target material and its preparation method and application. The champagne gold alloy target material provided by the present invention has a beautiful coating color and good oxidation resistance and corrosion resistance.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A champagne gold alloy target comprises the following chemical components in percentage by mass: Au 96-99wt.%, Fe 0.5-2.4wt.%, Ag 0.3-0.8wt.%, In 0.1-0.5wt.%, Zn 0.08-0.26wt.%, Nd 0.01-0.02wt.%, and Si 0.01-0.02wt.%.

[0008] The present invention also provides a method for preparing the champagne gold alloy target material described in the above scheme, comprising the following steps:

[0009] Gold, iron, silver, indium, neodymium, silicon and zinc are smelted and subsequently refined and cast to obtain a champagne gold alloy ingot;

[0010] The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence to obtain the champagne gold alloy target.

[0011] Preferably, the smelting temperature does not exceed 1200° C., and the smelting equipment used is a medium-frequency vacuum induction melting furnace, a high-frequency furnace or a resistance furnace.

[0012] Preferably, the refining temperature is 1150-1200° C. and the refining time is 5-15 minutes.

[0013] Preferably, the temperature of the homogenization heat treatment is 580-620° C., the time is 10-30 min, and the heating rate to the homogenization heat treatment temperature is 8-10° C. / min.

[0014] Preferably, the rolling process is cold rolling.

[0015] Preferably, the rolling process has a single-pass reduction of 10-15%, and a total reduction of 75-85%.

[0016] Preferably, the surface treatment includes grinding and / or polishing.

[0017] The present invention also provides the use of the champagne gold alloy target material described in the above scheme or the champagne gold alloy target material prepared by the preparation method described in the above scheme in vacuum magnetron sputtering coating.

[0018] Preferably, the chromaticity value of the film layer obtained by the vacuum magnetron sputtering coating is: L value is 87.2-88.5, a value is 1.3-6.4, and b value is 20.4-34.2.

[0019] The present invention provides a champagne gold alloy target material comprising the following chemical components by weight percentage: Au 96-99 wt.%, Fe 0.5-2.4 wt.%, Ag 0.3-0.8 wt.%, In 0.1-0.5 wt.%, Zn 0.08-0.26 wt.%, Nd 0.01-0.02 wt.%, and Si 0.01-0.02 wt.%. By adding iron (Fe) and silver (Ag) elements, the present invention can achieve a champagne gold color, improve the alloy's corrosion resistance, promote the alloy's fluidity, and increase the brightness of the metal alloy. Adding zinc (Zn) to gold (Au) can reduce its redness, improve the alloy's resistance to artificial sweat and salt spray, and increase the alloy's brightness. However, due to its significant impact on yellowness, it should be added in appropriate amounts. Adding indium (In) further promotes the champagne gold color and helps improve the alloy's corrosion resistance. The addition of neodymium (Nd) and silicon (Si) effectively refines the champagne gold alloy's grain size and improves its corrosion resistance. Meanwhile, silicon enhances its brightness. In summary, by varying the alloying elements and their contents, the present invention has developed a new champagne gold alloy target material with attractive color, excellent oxidation resistance, and corrosion resistance. This material meets market demand and has broad application prospects.

[0020] The present invention also provides the use of the champagne gold alloy target described in the above scheme in vacuum magnetron sputtering coating. The results of the examples show that the films deposited using the target material of the present invention have an L value of 87.2 to 88.5, an a value of 1.3 to 6.4, and a b value of 20.4 to 34.2. The films have beautiful colors and exhibit excellent oxidation resistance and corrosion resistance. They do not change color in artificial sweat tests for 360 to 432 hours and in salt spray tests for 240 to 360 hours. DETAILED DESCRIPTION

[0021] The present invention provides a champagne gold alloy target material, comprising the following chemical components in percentage by mass: Au 96-99wt.%, Fe 0.5-2.4wt.%, Ag 0.3-0.8wt.%, In 0.1-0.5wt.%, Zn 0.08-0.26wt.%, Nd 0.01-0.02wt.%, and Si 0.01-0.02wt.%.

[0022] In terms of mass percentage, the champagne gold alloy target provided by the present invention includes 96-99 wt.% of Au, specifically 96 wt.%, 96.5 wt.%, 97 wt.%, 97.5 wt.%, 98.2 wt.% or 99 wt.%.

[0023] In terms of mass percentage, the champagne gold alloy target provided by the present invention includes 0.5-2.4 wt.% of Fe, specifically 0.5 wt.%, 1.1 wt.%, 1.5 wt.%, 1.8 wt.%, 2.1 wt.% or 2.4 wt.%.

[0024] The champagne gold alloy target provided by the present invention includes 0.3 to 0.8 wt.% Ag, specifically 0.3 wt.%, 0.4 wt.%, 0.6 wt.%, 0.7 wt.%, or 0.8 wt.%. By adding Fe and Ag, the alloy can achieve a champagne gold color, improve the alloy's corrosion resistance, promote its fluidity, and increase its brightness.

[0025] In terms of mass percentage, the champagne gold alloy target provided by the present invention includes 0.1 to 0.5 wt.% of In, specifically 0.1 wt.%, 0.15 wt.%, 0.2 wt.%, 0.3 wt.%, 0.4 wt.% or 0.5 wt.%; the present invention further promotes the alloy to achieve the champagne gold effect by adding the In element, and helps to improve the corrosion resistance of the alloy.

[0026] The champagne gold alloy target provided by the present invention includes 0.08-0.26 wt.% of Zn, specifically 0.08 wt.%, 0.13 wt.%, 0.16 wt.%, 0.17 wt.%, 0.175 wt.% or 0.26 wt.% in terms of mass percentage. The present invention reduces the redness of the alloy by adding the Zn element, improves the alloy's resistance to artificial sweat, salt spray resistance and high temperature resistance, and can increase the brightness of the alloy. However, the addition of Zn has a significant impact on yellowness, so the addition should be appropriate.

[0027] In terms of mass percentage, the champagne gold alloy target provided by the present invention includes 0.01-0.02 wt.% of Nd, specifically 0.01 wt.%, 0.015 wt.% or 0.02 wt.%.

[0028] Calculated by mass percentage, the champagne gold alloy target provided by the present invention includes 0.01 to 0.02 wt.% of Si, specifically 0.015 wt.% or 0.02 wt.%; by adding Nd and Si elements, the present invention can effectively refine the grains of the champagne gold alloy and change the corrosion resistance of the champagne gold alloy. At the same time, the silicon element can improve the brightness of the alloy.

[0029] The present invention also provides a method for preparing the champagne gold alloy target material described in the above solution, comprising the following steps:

[0030] Gold, iron, silver, indium, neodymium, silicon and zinc are smelted and subsequently refined and cast to obtain a champagne gold alloy ingot;

[0031] The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence to obtain the champagne gold alloy target.

[0032] The present invention comprises smelting gold, iron, silver, indium, neodymium, silicon, and zinc, followed by sequential refining and casting to produce a champagne gold alloy ingot. In the present invention, the weight purity of the gold is preferably ≥99.99%, the weight purity of the iron is preferably ≥99.99%, the weight purity of the silver is preferably ≥99.99%, the weight purity of the indium is preferably ≥99.99%, the weight purity of the zinc is preferably ≥99.99%, the weight purity of the neodymium is preferably ≥99.95%, and the weight purity of the silicon is preferably ≥99.99%. The smelting temperature is preferably no more than 1200°C, specifically 1150-1200°C. The smelting equipment is preferably a medium-frequency vacuum induction melting furnace, a high-frequency furnace, or a resistance furnace. The crucible used for the smelting is preferably a graphite crucible. In a specific embodiment of the present invention, it is preferred to heat and melt gold first, then add iron, silver, indium, neodymium and silicon in sequence, and finally add zinc for smelting. The zinc is preferably added with 0.04wt.% fire loss, that is, the amount of zinc added is preferably 0.04wt.% in excess.

[0033] In the present invention, the refining temperature is preferably 1150-1200°C, and the refining time is preferably 5-15 minutes, more preferably 10 minutes. After refining, the molten metal is preferably allowed to stand for 3 minutes. After the standing time, the resulting molten metal is preferably poured into a water-cooled copper mold to obtain a champagne gold alloy ingot.

[0034] After obtaining the champagne gold alloy ingot, the present invention sequentially subjects the champagne gold alloy ingot to homogenization heat treatment, rolling, and surface treatment to obtain the champagne gold alloy target. In the present invention, the homogenization heat treatment temperature is preferably 580-620°C, specifically 580°C, 600°C, or 620°C. The homogenization heat treatment time is preferably 10-30 minutes, more preferably 20 minutes. The heating rate to the homogenization heat treatment temperature is preferably 8-10°C / min.

[0035] In the present invention, the rolling process is preferably cold rolling; the single-pass reduction of the rolling process is preferably 10-15%, specifically 10%, 12% or 15%, and the total reduction is preferably 75-85%, specifically 75%, 80% or 85%.

[0036] In the present invention, the surface treatment preferably includes grinding and / or polishing.

[0037] In the present invention, the thickness of the champagne gold alloy target is preferably 2.5 mm, and the specific size of the champagne gold alloy target can be cut according to the requirements of the coating machine.

[0038] The present invention also provides the use of the champagne gold alloy target described in the above embodiment, or the champagne gold alloy target prepared by the preparation method described in the above embodiment, in vacuum magnetron sputtering coating. In the present invention, the chromaticity of the film obtained by vacuum magnetron sputtering coating is: L value 87.2-88.5, a value 1.3-6.4, and b value 20.4-34.2. In specific embodiments of the present invention, the champagne gold alloy target can be used for coating in the decorative design and decorative processing industries.

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] The weight purity of the metal Au used in the embodiments of the present invention is ≥99.99%, the weight purity of the metal Fe is ≥99.99%, the weight purity of the metal Ag is ≥99.99%, the weight purity of the metal In is ≥99.99%, the weight purity of the metal Zn is ≥99.99%, the weight purity of the metal Nd is ≥99.95%, and the weight purity of Si is ≥99.99%.

[0041] The heating device used in the embodiment of the present invention is a medium frequency vacuum induction melting furnace, and the melting crucible used is a graphite crucible.

[0042] In the embodiment of the present invention, a PVD880B vacuum coating machine is used to carry out the coating experiment.

[0043] In the embodiments of the present invention, corrosion resistance tests were performed using artificial sweat immersion (artificial sweat resistance test) and salt spray corrosion (salt spray resistance test). The artificial sweat composition consisted of 20 g / L sodium chloride (NaCl), 17.5 g / L ammonium chloride (NH4Cl), 5 g / L urea (CH4N2O), 2.5 g / L acetic acid (CH3COOH), 15 g / L lactic acid (C3H6O3), and sodium hydroxide (NaOH). The pH of the artificial sweat was adjusted to 4.7 by adjusting the sodium hydroxide content. The salt spray corrosion test solution used was a sodium chloride (NaCl) solution with a concentration of 5 ± 0.1 wt%. After spraying the solution at 35°C, the pH of the collected solution should be between 6.5 and 7.2.

[0044] The target material prepared in the example of the present invention has a size of 60×60×2.5 mm.

[0045] Example 1

[0046] First, Au is heated and melted, and then Fe, Ag, In, Nd and Si are added in sequence, and finally Zn is added for smelting, with 0.04wt.% fire loss added to Zn. After all the metals are melted, they are stirred evenly, refined at 1200℃ for 10 minutes, allowed to stand for 3 minutes, and then poured into a cast iron mold to obtain a champagne gold alloy ingot. The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence, and then leveled and sheared to obtain a 2.5mm thick champagne gold alloy target. The homogenization heat treatment temperature is 580℃ and the time is 20 minutes. After the homogenization treatment, it is cooled to room temperature; the rolling process is cold rolling, the single-pass reduction is 10%, and the total reduction is 75%.

[0047] The composition of the obtained champagne gold alloy target is: 96.0wt.% Au, 2.4wt.% Fe, 0.8wt.% Ag, 0.5wt.% In, 0.26wt.% Zn, 0.02wt.% Nd, and 0.02wt.% Si.

[0048] The coating experiment was carried out using a PVD880B vacuum coating machine. The film layer had a chromaticity of L=87.2, a=1.3, and b=20.4. The film layer could withstand artificial sweat for 360 hours without discoloration, and could withstand salt spray for 240 hours without corrosion.

[0049] Example 2

[0050] First, Au is heated and melted, and then Fe, Ag, In, Nd and Si are added in sequence, and finally Zn is added for smelting, with Zn adding 0.04wt.% fire loss. After all the metals are melted, stir them evenly, refine them at 1200℃ for 10 minutes, let them stand for 3 minutes, and then pour them into a cast iron mold to obtain a champagne gold alloy ingot. The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence, and then leveled and sheared to obtain a champagne gold alloy target with a thickness of 2.5mm. The temperature of the homogenization heat treatment is 580℃, the time is 20 minutes, and after homogenization treatment, it is cooled to room temperature; the rolling processing is cold rolling, the single-pass reduction is 10%, and the total reduction is 75%.

[0051] The composition of the obtained champagne gold alloy target is: 96.5wt.% Au, 2.1wt.% Fe, 0.8wt.% Ag, 0.4wt.% In, 0.16wt.% Zn, 0.02wt.% Nd, and 0.02wt.% Si.

[0052] The coating experiment was carried out using a PVD880B vacuum coating machine. The film layer had a chromaticity of L=87.2, a=1.8, and b=22.3. The film layer could withstand artificial sweat for 368 hours without discoloration, and could withstand salt spray for 256 hours without corrosion.

[0053] Example 3

[0054] First, Au is heated and melted, and then Fe, Ag, In, Nd and Si are added in sequence, and finally Zn is added for smelting, with Zn adding 0.04wt.% fire loss. After all the metals are melted, stir them evenly, refine them at 1200℃ for 10 minutes, let them stand for 3 minutes, and then pour them into a cast iron mold to obtain a champagne gold alloy ingot. The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence, and then leveled and sheared to obtain a champagne gold alloy target with a thickness of 2.5mm. The temperature of the homogenization heat treatment is 600℃ and the time is 20 minutes. After the homogenization treatment, it is cooled to room temperature; the rolling process is cold rolling, the single-pass reduction is 12%, and the total reduction is 80%.

[0055] The composition of the obtained thick champagne gold alloy target is: 97.0wt.% Au, 1.8wt.% Fe, 0.7wt.% Ag, 0.3wt.% In, 0.17wt.% Zn, 0.015wt.% Nd, and 0.015wt.% Si.

[0056] The coating experiment was carried out using a PVD880B vacuum coating machine. The film layer had a chromaticity of L=87.4, a=2.2, and b=23.7. The film layer could withstand artificial sweat for 384 hours without discoloration, and could withstand salt spray for 288 hours without corrosion.

[0057] Example 4

[0058] First, Au is heated and melted, and then Fe, Ag, In, Nd and Si are added in sequence, and finally Zn is added for smelting, with Zn adding 0.04wt.% fire loss. After all the metals are melted, stir them evenly, refine them at 1200℃ for 10 minutes, let them stand for 3 minutes, and then pour them into a cast iron mold to obtain a champagne gold alloy ingot. The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence, and then leveled and sheared to obtain a champagne gold alloy target with a thickness of 2.5mm. The temperature of the homogenization heat treatment is 600℃ and the time is 20 minutes. After the homogenization treatment, it is cooled to room temperature; the rolling process is cold rolling, the single-pass reduction is 12%, and the total reduction is 80%.

[0059] The composition of the obtained champagne gold alloy target is: 97.5wt.% Au, 1.5wt.% Fe, 0.6wt.% Ag, 0.2wt.% In, 0.175wt.% Zn, 0.01wt.% Nd, 0.015wt.% Si.

[0060] The coating experiment was carried out using a PVD880B vacuum coating machine. The film layer had a chromaticity of L=87.8, a=3.1, and b=25.4. The film layer could withstand artificial sweat for 408 hours without discoloration, and could withstand salt spray for 300 hours without corrosion.

[0061] Example 5

[0062] First, Au is heated and melted, and then Fe, Ag, In, Nd and Si are added in sequence, and finally Zn is added for smelting, with Zn adding 0.04wt.% fire loss. After all the metals are melted, stir them evenly, refine them at 1200℃ for 10 minutes, let them stand for 3 minutes, and then pour them into a cast iron mold to obtain a champagne gold alloy ingot. The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence, and then leveled and sheared to obtain a champagne gold alloy target with a thickness of 2.5mm. The temperature of the homogenization heat treatment is 620℃, the time is 20 minutes, and after the homogenization treatment, it is cooled to room temperature; the rolling process is cold rolling, the single-pass reduction is 12%, and the total reduction is 85%.

[0063] The obtained champagne gold alloy target has the following contents: 98.2wt.% Au, 1.1wt.% Fe, 0.4wt.% Ag, 0.15wt.% In, 0.13wt.% Zn, 0.01wt.% Nd, and 0.01wt.% Si.

[0064] The coating experiment was carried out using a PVD880B vacuum coating machine. The film layer had a chromaticity of L=88.0, a=4.6, and b=30.1. The film layer could withstand artificial sweat for 416 hours without discoloration, and could withstand salt spray for 324 hours without corrosion.

[0065] Example 6

[0066] First, Au is heated and melted, and then Fe, Ag, In, Nd and Si are added in sequence, and finally Zn is added for smelting, with Zn adding 0.04wt.% fire loss. After all the metals are melted, stir them evenly, refine them at 1200℃ for 10 minutes, let them stand for 3 minutes, and then pour them into a cast iron mold to obtain a champagne gold alloy ingot. The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence, and then leveled and sheared to obtain a champagne gold alloy target with a thickness of 2.5mm. The temperature of the homogenization heat treatment is 620℃, the time is 20 minutes, the homogenization treatment is carried out, and the target is cooled to room temperature; the rolling processing is cold rolling, the single-pass reduction is 15%, and the total reduction is 85%.

[0067] The composition of the obtained champagne gold alloy target is: 99.0wt.% Au, 0.5wt.% Fe, 0.3wt.% Ag, 0.1wt.% In, 0.08wt.% Zn, 0.01wt.% Nd, 0.01wt.% Si.

[0068] The coating experiment was carried out using a PVD880B vacuum coating machine. The film layer had a chromaticity of L=88.5, a=6.4, and b=34.2. The film layer could withstand artificial sweat for 432 hours without discoloration, and could withstand salt spray for 360 hours without corrosion.

[0069] In summary, the present invention develops a new champagne gold alloy target material with excellent oxidation resistance and corrosion resistance and beautiful color by changing the alloying elements and their contents, as well as improving the smelting and processing technology, which has broad market prospects.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A champagne gold alloy target, characterized in that: The invention comprises the following chemical components in percentage by mass: Au 96-99wt.%, Fe 0.5-2.4wt.%, Ag 0.3-0.8wt.%, In 0.1-0.5wt.%, Zn 0.08-0.26wt.%, Nd 0.01-0.02wt.%, and Si 0.01-0.02wt.%.

2. The method for preparing the champagne gold alloy target according to claim 1, characterized in that: The following steps are involved: Gold, iron, silver, indium, neodymium, silicon and zinc are smelted and subsequently refined and cast to obtain a champagne gold alloy ingot; The champagne gold alloy ingot is subjected to homogenization heat treatment, rolling processing and surface treatment in sequence to obtain the champagne gold alloy target.

3. The preparation method according to claim 2, characterized in that The smelting temperature does not exceed 1200° C., and the smelting equipment used is a medium-frequency vacuum induction melting furnace, a high-frequency furnace or a resistance furnace.

4. The preparation method according to claim 2, characterized in that The refining temperature is 1150-1200° C., and the refining time is 5-15 minutes.

5. The preparation method according to claim 2, characterized in that The temperature of the homogenization heat treatment is 580-620° C., the time is 10-30 min, and the heating rate to the homogenization heat treatment temperature is 8-10° C. / min.

6. The preparation method according to claim 2, characterized in that The rolling process is cold rolling.

7. The preparation method according to claim 2 or 6, characterized in that The single-pass reduction of the rolling process is 10-15%, and the total reduction is 75-85%.

8. The preparation method according to claim 2, characterized in that The surface treatment includes grinding and / or polishing.

9. Use of the champagne gold alloy target material according to claim 1 or the champagne gold alloy target material prepared by the preparation method according to any one of claims 2 to 8 in vacuum magnetron sputtering coating.

10. The use according to claim 9, characterized in that The chromaticity value of the film layer obtained by the vacuum magnetron sputtering coating is as follows: L value is 87.2-88.5, a value is 1.3-6.4, and b value is 20.4-34.2.