CN110029247B - High-discoloration-resistance golden brass alloy and preparation method thereof - Google Patents
High-discoloration-resistance golden brass alloy and preparation method thereof Download PDFInfo
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Abstract
A high discoloration-resistant golden brass alloy and a preparation method thereof. The alloy comprises the following components of Mn, Sn, Ni, Zn, Sr, Ce, B and Si, and the balance of Cu and inevitable impurities. The preparation process comprises the following steps: casting; hot rolling; cold rolling and intermediate annealing; cold fine rough rolling, cold fine rolling and finished product annealing. The alloy produced by the method has high gold chromaticity, good discoloration resistance, excellent hot and cold processing properties and small deformation resistance; does not contain noble metal elements and has lower cost. The alloy disclosed by the invention is reasonable in components, the gold degree of the alloy is improved by reasonably matching cheap manganese, nickel, zinc and tin, the content of zinc is lower than 20%, dezincification corrosion can be avoided, and the reasonable matching of strontium, cerium, boron and silicon can improve the process performance and improve the anti-discoloration performance. The alloy has the advantages of simple production process, low production cost, good processability, high gold degree, excellent anti-discoloration performance in environments such as salt mist, high humidity, artificial sweat and the like, and is suitable for industrial production.
Description
Technical Field
The invention relates to a high-discoloration-resistance gold brass alloy and a preparation method thereof, which are mainly applied to artworks, bookmarks, commemorative coins (medals) and various decorative materials. Belongs to the technical field of new materials.
Background
Gold has gorgeous golden color and very stable chemical property, and is a preferred material for products such as artworks, artworks and the like except being widely applied to the fields of electronic information and the like as a functional material. However, because of its low reserves and high price, its application in mass as a mass artwork market is limited, so that the gold-like alloy products with high quality and low price are increasingly gaining attention.
The gold imitation products used at home and abroad are mainly copper-based gold imitation products. The most of domestic research is to add aluminum, zinc, tin, nickel, rare earth and other elements into copper to regulate and control the color and improve the anti-discoloration performance of the copper, but in order to improve the color and the anti-discoloration performance of the gold-imitating products, alloy elements which are more expensive than copper, such as indium, silver and the like, need to be added firstly. In addition, the gold-like alloys have poor gold chromaticity and poor discoloration resistance, wherein the discoloration resistance refers to the capability of the material to maintain the original surface gloss and chromaticity in the process of being surrounded by artificial sweat, hydrogen sulfide, sulfur dioxide, salt mist, high-temperature damp heat and other specific environments for a long time. For gold imitation products, if the original golden color of the surface is lost, the use value is lost. Therefore, the discoloration resistance of the gold-like alloy is a very important parameter. In order to improve the anti-discoloration performance of the imitation gold alloy, noble metals or high-melting point metals are mainly added in the prior art, but the problems of high cost or difficult processing exist, and the imitation gold alloy is difficult to popularize and use in industrial production. For example, In the alloy of Chinese patent CN88100404A is a rare metal, so that the price is high and the resource is less; the gold content in CN201210364872.7 and CN201210369055.0 patent alloys is 0.5-10%, the CN201210369055.0 patent alloy contains 1-20% of silver, and the golden yellow copper-based gold-imitating alloy designed in the CN201710688041.8 patent contains cobalt, indium and the like, so that the golden yellow copper-based gold-imitating alloy contains a large amount of noble metal elements, is high in price and has certain difficulty in popularization and application. The alloy provided by Japanese patent JP89275730 and JP89270707 has good comprehensive properties, and the alloy of the two Japanese patents is difficult to cast due to the addition of Cr with high melting point and high content. The patent CN201610604733.5 contains high-melting-point iron, and Fe can be precipitated from a copper matrix under certain conditions to form a second phase, so that electrochemical corrosion is easy to occur.
According to the invention, Sn, Ni, Zn, Sr, Ce, Bi, Si and the like are mainly added into the copper alloy, and the chemical properties of all elements are utilized or a compact protective film is formed on the surface of the copper alloy, so that the discoloration resistance of the gold-like copper alloy in various environments is remarkably improved, the discoloration resistance of the copper alloy is improved, the corrosion resistance is better, and meanwhile, the production cost of the gold-like copper alloy is greatly reduced by the alloy system.
Disclosure of Invention
The invention aims to overcome the problems that the existing gold-colored copper alloy has poor anti-tarnishing capability and the preparation cost of the material is high due to the high-price alloy elements such as indium, silver and the like, and provides the high-tarnishing-resistant gold-colored copper alloy which has reasonable alloy components, cheap raw materials, simple production process, low production cost, good processing performance, high gold degree, excellent anti-tarnishing capability under the environments of salt mist, high humidity, artificial sweat and the like and is environment-friendly and the preparation method thereof, so as to meet the requirements of various decorative materials, artware and the like on the high-tarnishing-resistant gold-colored copper alloy.
The invention relates to a high-discoloration-resistance golden brass alloy which comprises the following components in percentage by weight:
Mn:0.5-5.0wt.％，
Sn:0.7-1.5wt.％，
Ni:0.7-2.0wt.％，
12-14 wt.% of Zn and the balance of Cu, wherein the sum of the mass percentages of the components is 100%.
The invention relates to a high-discoloration-resistance golden brass alloy which comprises the following components in percentage by weight:
Mn:1.0-4.5wt.％，
Sn:0.7-1.4wt.％，
Ni:0.7-2.2wt.％，
11.5 to 14.5 weight percent of Zn and the balance of Cu, wherein the sum of the mass percentages of the components is 100 percent.
The invention relates to a high-discoloration-resistance golden brass alloy which comprises the following components in percentage by weight:
Mn:2.0-4.0wt.％，
Sn:0.7-1.3wt.％，
Ni:0.7-2.0wt.％，
12-14 wt.% of Zn and the balance of Cu, wherein the sum of the mass percentages of the components is 100%.
The invention relates to a high discoloration resistance golden brass alloy, which also comprises Sr accounting for 0.05-0.1 wt% of the alloy.
The invention relates to a high-discoloration-resistance golden brass alloy, which also comprises 0.08-0.12 wt.% of Ce in percentage by weight of the alloy.
The invention relates to a high-discoloration-resistance golden brass alloy, which also comprises 0.03-0.1 wt.% of B in percentage by weight of the alloy.
The invention relates to a high discoloration resistance golden brass alloy, which also comprises Si accounting for 0.1-0.2 wt% of the alloy.
The invention relates to a preparation method of a high-discoloration-resistance golden brass alloy, which comprises the following steps:
the first step is as follows: smelting and ingot casting
Preparing each component according to the designed golden copper alloy component proportion, wherein zinc and nickel are added in pure metal, copper is added in the form of electrolytic copper, and the rest components are added in the form of intermediate alloy; firstly, drying, heating and melting electrolytic copper, then adding the rest components into the electrolytic copper melt to obtain an alloy melt, controlling the furnace temperature at 1200-;
the second step is that: hot rolling
Heating and preserving the copper alloy ingot obtained in the first step at the temperature of 680-700 ℃ for 4-6 hours, then heating to the temperature of 800-850 ℃ for 2-3 hours, continuously carrying out 7-9 times of hot rolling, controlling the total hot rolling deformation to be 75-95%, and carrying out air cooling to obtain a hot rolled blank;
the third step: cold rolling, intermediate recrystallization annealing
Performing multi-pass cold rolling on the hot rolled blank obtained in the second step, wherein the deformation of the first cold rolling is 20-26%, and the total rolling deformation is 60-75%, so as to obtain a cold rolled blank; carrying out intermediate recrystallization annealing and water quenching on the obtained cold-rolled blank;
the fourth step: cold finish rolling, recrystallization annealing of finished product
And (4) performing cold finish rolling on the cold-rolled blank subjected to intermediate recrystallization annealing in the third step by 30-60% of deformation, performing recrystallization annealing on a finished product, and discharging from a furnace for nitrogen quenching to obtain the copper alloy plate.
The invention relates to a preparation method of a high-discoloration-resistance golden brass alloy, which comprises the following steps of adding alloy components of manganese, silicon, strontium and cerium into copper-manganese intermediate alloys, copper-silicon intermediate alloys, copper-strontium intermediate alloys and copper-cerium intermediate alloys respectively, and adding boron into nickel-boron intermediate alloys.
The invention relates to a preparation method of a high discoloration resistance gold brass alloy, which comprises the following steps of in the first step, adopting a medium-frequency induction melting furnace for heating and melting, adopting cryolite, calcium fluoride and burnt borax as covering agents in the melting process, wherein the volume percentage is 1: 1: 1.
the invention relates to a preparation method of a high discoloration-resistant golden brass alloy, wherein in the first step, the average casting speed of semi-continuous casting is 4.5-6.5 m/h.
The invention relates to a preparation method of a high discoloration-resistant golden brass alloy, in the second step, the deformation of the first hot rolling is 25-30%, the deformation of the second to fifth hot rolling is 30-50%, and the deformation is gradually reduced after the sixth hot rolling, wherein the deformation is 15-25%.
The invention relates to a preparation method of a high discoloration resistance golden brass alloy, and in the third step, a hot rolled blank is subjected to surface milling and then is subjected to multi-pass cold rolling, wherein the thickness of the milled surface is 0.3-0.6 mm.
The invention relates to a preparation method of a high discoloration-resistant golden brass alloy, which comprises the following steps of intermediate recrystallization annealing in the third step and recrystallization annealing of a finished product in the fourth step: the heat preservation temperature is 690 plus 740 ℃, the atmosphere is decomposed ammonia, and the heat preservation time is 120 plus 180 min.
The invention relates to a preparation method of a high color-change-resistant golden brass alloy, which is characterized in that the prepared high color-change-resistant golden brass alloy is stored for 120 hours in a salt spray environment according to the GB/T10125-1997 method, and the color difference changes delta E*≤33.1；
Storing the mixture in a high-humidity environment with the temperature of 45 ℃ and the humidity of 90 percent for 120 hours, wherein the color difference changes delta E*≤12.7；
At 30 deg.C, the solution is Na with mass concentration of 0.1% and pH 42SO3Storing the solution in SO2 environment formed by spraying liquid once every 150s for 120 hours, wherein the color difference changes delta E*≤10.7；
At 30 deg.C, the solution is Na with mass concentration of 0.1% and pH of 3.52S solution, spraying liquid for every 20S to form H2Color difference change delta E after 120-hour storage in S environment*≤9.7；
Storing the mixture in an artificial sweat environment consisting of liquid spraying once every 20s at the temperature of 30 ℃ for 120 hours, wherein the color difference changes delta E*≤50.5。
Because the components are mixed according to the proportion, the produced alloy has the characteristics of high gold chromaticity, good cutting processing performance, good discoloration resistance in environments such as salt mist, high humidity, artificial sweat and the like, excellent hot and cold processing performance, low price of raw materials, suitability for industrial production and the like.
The invention has the advantages that:
the gold-imitation brass alloy can be used in the fields of jewelry, art sculptures, prizes, labels, commemorative coins (medals), decorations and the like.
The component ranges of all alloy elements can ensure that the alloy elements are dissolved in the copper matrix in a solid manner, and a second phase is not precipitated, so that the risk of electrochemical corrosion is effectively reduced;
the synergistic addition of Mn, Sn and Ni in white system plays a role of toner, can adjust the color of copper, and improves the gold-like effect of the alloy to ensure that the copper is transited from red to rose gold to golden gold. The addition of manganese also has the effect of lowering the melting point of the alloy.
There are three kinds of dense oxides in nature, which are aluminum oxide, silicon dioxide and chromium oxide. In the present invention, silicon serves to refine the structure grains while forming a dense oxide film, to improve discoloration and corrosion resistance, to increase the brightness of the alloy surface, and to deteriorate the cold workability if the amount of silicon added is greater than 0.2%.
The strontium is added into the alloy, so that the uniform distribution of various alloy elements in the gold-like copper alloy in a copper matrix can be promoted, the electrode potentials of all parts are balanced, the electrode potentials of all parts are consistent, the occurrence of electrochemical corrosion is obviously inhibited, and the anti-discoloration performance of the gold-like copper alloy is improved.
The addition of the rare earth cerium can react with impurity elements in the copper alloy, purify a melt to redissolve an ingot casting structure, improve the discoloration resistance of the alloy, and also improve the discoloration resistance and brightness of the alloy. The combined addition of cerium and boron can improve the discoloration resistance of the alloy.
The invention does not contain toxic and harmful elements and noble elements in the component ratio, and the alloy components are all elements rich in China.
Because the main elements of the designed alloy do not contain expensive metals such as silver, indium and the like, the production cost of the alloy is reduced, and the industrial production is facilitated. Meanwhile, the gradient heating mode is adopted, so that the tin can be completely dissolved in the copper matrix before hot rolling, and the problem of hot rolling cracking can be thoroughly avoided. Because the zinc content in the alloy is lower than 15 percent, the dezincification corrosion in a hot or corrosive environment is avoided.
The matching relationship between the component elements and the optimal content of the alloy prepared by the invention is different from the matching relationship between the component elements and the content of the alloy reported in the prior literature or patent.
In conclusion, the alloy disclosed by the invention is reasonable in components, low in raw material price, simple in production process, low in production cost, good in processability, high in gold degree, excellent in discoloration resistance in environments such as salt mist, high humidity and artificial sweat, and suitable for industrial production.
Detailed Description
In table 1 of the inventive examples: l- - - - - -lightness axis; a-red green chromaticity axis; b- - -yellow-blue pintles; dL- - - -change in lightness; da-red-green color change; db-change in yellow-blue; dE-integrated chromatic aberration.
In Table 2,. DELTA.E*-color difference change.
Example 1
The gold copper alloy with the components of 2.0 wt% of Mn, 1.3 wt% of Sn, 1.0 wt% of Ni, 13 wt% of Zn, 0.05 wt% of Sr, 0.1 wt% of Ce, 0.1 wt% of B, 0.15 wt% of Si and the balance of copper is mixed according to the proportion, and pure zinc, pure nickel, copper-manganese, copper-silicon, copper-strontium, copper-cerium, nickel-boron intermediate alloy and electrolytic copper are respectively taken; firstly, drying electrolytic copper, adding nickel, heating and melting, wherein cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1: 1. then, adding copper-manganese, copper-silicon, copper-strontium, copper-cerium and nickel-boron intermediate alloy into the electrolytic copper melt to obtain an alloy melt, controlling the furnace temperature at 1210 ℃, carrying out semi-continuous casting at 1190 ℃ in a converter, and carrying out average casting at 6.0 m/h. Heating and preserving the copper alloy cast ingot at 690 ℃ for 6 hours, heating to 800 ℃ for 3 hours, carrying out 9-pass hot rolling, wherein the deformation of the first-pass hot rolling is 28%, the deformation of the second-pass to the fifth-pass can be increased, the processing of the subsequent-pass is gradually reduced, the total deformation of the hot rolling reaches 80%, and carrying out air cooling to obtain a hot rolled blank; milling the surfaces, wherein the milled thicknesses of the two surfaces are 0.5mm respectively, performing multi-pass cold rolling, wherein the deformation of the first pass cold rolling is 21%, and the total deformation is 70%, so as to obtain a cold rolling blank; keeping the obtained cold rolling blank at 730 ℃ in an ammonia decomposition atmosphere for 150min, and carrying out intermediate recrystallization annealing and water quenching; and (3) performing cold finish rolling with the deformation of 45% on the cold-rolled blank subjected to intermediate recrystallization annealing, performing recrystallization annealing on the finished product in an air cushion furnace at the temperature of 720 ℃ under the atmosphere of decomposed ammonia for 120min, and discharging from the furnace for nitrogen quenching to obtain the gold-like copper alloy plate 1.
Example 2
The gold copper alloy with the components of 3.0 wt% of Mn, 0.7 wt% of Sn, 0.7 wt% of Ni, 14 wt% of Zn, 0.05 wt% of Sr, 0.1 wt% of Ce, 0.1 wt% of B, 0.2 wt% of Si and the balance of copper is mixed according to the proportion, and pure zinc, pure nickel, copper-manganese, copper-silicon, copper-strontium, copper-cerium, nickel-boron intermediate alloy and electrolytic copper are respectively taken; firstly, drying electrolytic copper, adding nickel, heating and melting, wherein cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1: 1. then, adding copper-manganese, copper-silicon, copper-strontium, copper-cerium and nickel-boron intermediate alloy into the electrolytic copper melt to obtain an alloy melt, controlling the furnace temperature at 1220 ℃, carrying out semi-continuous casting at 1200 ℃ in a converter, and carrying out average casting at the speed of 5.5 m/h. Heating and preserving the copper alloy cast ingot at 690 ℃ for 6 hours, heating to 825 ℃ for 3 hours, carrying out 9-pass hot rolling, wherein the deformation of the first-pass hot rolling is 30%, the deformation of the second-pass to the fifth-pass is increased, the processing of the subsequent-pass is gradually reduced, the total hot rolling deformation reaches 85%, and carrying out air cooling to obtain a hot rolling blank; milling the surfaces, wherein the milled thicknesses of the two surfaces are 0.5mm respectively, performing multi-pass cold rolling, wherein the deformation of the first pass cold rolling is 23%, and the total deformation is 68%, so as to obtain a cold rolling blank; keeping the obtained cold rolling blank at 730 ℃ in an ammonia decomposition atmosphere for 150min, and performing intermediate recrystallization annealing water quenching; and (3) performing cold finish rolling with the deformation of 55% on the cold-rolled blank subjected to intermediate recrystallization annealing, performing recrystallization annealing on the finished product in an air cushion furnace at the temperature of 720 ℃ under the atmosphere of decomposed ammonia for 120min, and discharging from the furnace for nitrogen quenching to obtain the gold-like copper alloy plate 2.
Example 3
The gold copper alloy with the components of 4.0 wt% of Mn, 1.0 wt% of Sn, 2.0 wt% of Ni, 14 wt% of Zn, 0.05 wt% of Sr, 0.1 wt% of Ce, 0.1 wt% of B, 0.1 wt% of Si and the balance of copper is mixed according to the proportion, and pure zinc, pure nickel, copper-manganese, copper-silicon, copper-strontium, copper-cerium, nickel-boron intermediate alloy and electrolytic copper are respectively taken; firstly, drying electrolytic copper, adding nickel, heating and melting, wherein cryolite, calcium fluoride and burnt borax are adopted as covering agents in the melting process, and the volume percentage is 1: 1: 1. then, adding copper-manganese, copper-silicon, copper-strontium, copper-cerium and nickel-boron intermediate alloy into the electrolytic copper melt to obtain an alloy melt, controlling the furnace temperature at 1230 ℃, carrying out semi-continuous casting at 1200 ℃ in a converter, and carrying out average casting at the speed of 5.0 m/h. Heating and preserving the copper alloy ingot at 690 ℃ for 6 hours, heating to 850 ℃ for 3 hours, carrying out 9-pass hot rolling, wherein the deformation of the first-pass hot rolling is 30%, the deformation of the second-pass to the fifth-pass is increased, the processing of the subsequent-pass is gradually reduced, the total hot rolling deformation reaches 89%, and carrying out air cooling to obtain a hot rolling blank; milling the surfaces, wherein the milled thicknesses of the two surfaces are 0.5mm respectively, performing multi-pass cold rolling, wherein the deformation of the first pass cold rolling is 25%, and the total deformation is 72%, so as to obtain a cold rolling blank; keeping the obtained cold rolling blank at 730 ℃ in an ammonia decomposition atmosphere for 150min, and performing intermediate recrystallization annealing water quenching; and (3) performing cold finish rolling with the deformation of 50% on the cold-rolled blank subjected to intermediate recrystallization annealing, performing recrystallization annealing on the finished product in an air cushion furnace at the temperature of 720 ℃ under the atmosphere of decomposed ammonia for 120min, and discharging from the furnace for nitrogen quenching to obtain the gold-like copper alloy plate 3.
Three alloy plates of examples 1, 2 and 3 of the present invention and corrosion resistant brass HSn72-1-1 which is commercially available were processed into green compacts, which were subjected to a gold color test using a 6801 color difference meter manufactured by BYK-GARDNER GMBH of Germany after polishing, and the gold color test was compared with gold, and the data are shown in Table 1, and it was found that the lightness and color of the alloy of the present invention are closer to gold than those of HSn 72-1-1. The color difference change (delta E) of the four alloys after being stored for 120 hours in different environments*) As shown in Table 2, it can be seen that the alloy of the present invention has superior discoloration resistance under various environments.
TABLE 1
| L* | a* | b* | dL* | da* | db* | dE* | |
| Gold | 36.97 | 5.22 | 24.04 | 0 | 0 | 0 | 0 |
| Example 1 | 50.10 | 4.00 | 18.21 | 10.90 | -1.73 | -6.06 | 11.65 |
| Example 2 | 47.01 | 3.78 | 21.63 | 7.4 | -1.72 | -4.06 | 7.99 |
| Example 3 | 50.03 | 3.25 | 18.10 | 8.3 | -2.68 | -5.01 | 9.89 |
| HSn72-1-1 | 61.73 | -0.03 | 20.02 | 24.79 | -5.26 | -4.02 | 25.48 |
TABLE 2
| △EHigh humidity | △E*S0 2 | △E*H 2 S | △EArtificial sweat | △ESalt spray | |
| Example 1 | 12.2 | 10.7 | 9.2 | 40.2 | 33.1 |
| Example 2 | 10.7 | 9.6 | 9.7 | 50.5 | 28.3 |
| Example 3 | 8.3 | 7.6 | 7.2 | 32.7 | 30.8 |
| HSn72-1-1 | 13.2 | 12.8 | 12.5 | 59.5 | 48.4 |
Claims (8)
1. The high-discoloration-resistance golden brass alloy comprises the following components in percentage by weight:
Mn:0.5-5.0wt.%，
Sn:0.7-1.5 wt.%，
Ni:0.7-2.0 wt. %，
Zn:12-14 wt. %，
0.03-0.10 wt% of B, and the balance of Cu, wherein the mass percentage sum of all the components is 100%; the preparation method comprises the following steps:
the first step is as follows: smelting and ingot casting
Preparing each component according to the designed golden copper alloy component proportion, wherein zinc and nickel are added in pure metal, copper is added in the form of electrolytic copper, and the rest components are added in the form of intermediate alloy; firstly, drying, heating and melting electrolytic copper, then adding the rest components into the electrolytic copper melt to obtain an alloy melt, controlling the furnace temperature at 1200-;
the second step is that: hot rolling
Heating and preserving the copper alloy ingot obtained in the first step at the temperature of 680-700 ℃ for 4-6 hours, then heating to the temperature of 800-850 ℃ for 2-3 hours, continuously carrying out 7-9 times of hot rolling, controlling the total hot rolling deformation to be 75-95%, and carrying out air cooling to obtain a hot rolled blank;
the third step: cold rolling, intermediate recrystallization annealing
Performing multi-pass cold rolling on the hot rolled blank obtained in the second step, wherein the deformation of the first cold rolling is 20-26%, and the total rolling deformation is 60-75%, so as to obtain a cold rolled blank; carrying out intermediate recrystallization annealing and water quenching on the obtained cold-rolled blank;
the fourth step: cold finish rolling, recrystallization annealing of finished product
And (4) performing cold finish rolling on the cold-rolled blank subjected to intermediate recrystallization annealing in the third step by 30-60% of deformation, performing recrystallization annealing on a finished product, and discharging from a furnace for nitrogen quenching to obtain the copper alloy plate.
2. The high tarnish resistance gold brass alloy according to claim 1, further comprising 0.05 to 0.1 wt.% Sr in terms of weight percent of the alloy.
3. The high tarnish resistance gold brass alloy according to claim 2, further comprising 0.08-0.12 wt.% of Ce, based on the weight of the alloy.
4. The high tarnish resistance gold brass alloy according to any of claims 1-3, further comprising Si in an amount of 0.1-0.2% by weight of the alloy.
5. The high resistance to discoloration of the gold brass alloy of claim 4, wherein: the alloy components of manganese, silicon, strontium and cerium are respectively added in the form of copper-manganese intermediate alloy, copper-silicon intermediate alloy, copper-strontium intermediate alloy and copper-cerium intermediate alloy, and boron is added in the form of nickel-boron intermediate alloy; heating and melting by adopting a medium-frequency induction melting furnace; the average casting speed of the semi-continuous casting is 4.5-6.5 m/h.
6. The high resistance to discoloration of the gold brass alloy of claim 5, wherein: in the second step, the deformation of the first hot rolling is 25-30%, the deformation of the second to fifth hot rolling is 30-50%, and the deformation is gradually reduced after the sixth hot rolling, wherein the deformation is 15-25%.
7. The high resistance to discoloration of the gold brass alloy of claim 6, wherein: the intermediate recrystallization annealing in the third step and the finished product recrystallization annealing in the fourth step are as follows: the heat preservation temperature is 690 plus 740 ℃, the atmosphere is decomposed ammonia, and the heat preservation time is 120 plus 180 min.
8. The gold brass alloy with high color difference resistance as claimed in claim 7, wherein the gold brass alloy with high color difference resistance is prepared by storing for 120 hours in salt fog environment according to GB/T10125-1997 and the color difference change delta E*≤33.1；
Storing the mixture in a high-humidity environment with the temperature of 45 ℃ and the humidity of 90 percent for 120 hours, wherein the color difference changes delta E*≤12.7；
At 30 deg.C, the solution is Na with mass concentration of 0.1% and pH =42SO3Solution, spraying SO once every 150s2Color difference change delta E after 120 hours of storage in environment*≤10.7；
At 30 deg.C, the solution is Na with mass concentration of 0.1% and pH =3.52S solution, spraying liquid for every 20S to form H2Color difference change delta E after 120-hour storage in S environment*≤9.7；
Storing the mixture in an artificial sweat environment consisting of liquid spraying once every 20s at the temperature of 30 ℃ for 120 hours, wherein the color difference changes delta E*≤50.5。
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| CN113564411B (en) * | 2021-07-29 | 2022-05-31 | 沈阳造币有限公司 | High-corrosion-resistance anti-tarnishing imitation gold copper alloy and preparation method thereof |
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