CN108838340B - Noble metal processing method - Google Patents
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- CN108838340B CN108838340B CN201810683437.8A CN201810683437A CN108838340B CN 108838340 B CN108838340 B CN 108838340B CN 201810683437 A CN201810683437 A CN 201810683437A CN 108838340 B CN108838340 B CN 108838340B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/18—Finishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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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
- C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
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Abstract
The invention discloses a noble metal processing method, which comprises the following steps: cutting the noble metal, then placing the cut noble metal in a smelting furnace for smelting, obtaining casting liquid after the noble metal is completely melted, uniformly and slowly casting the casting liquid into a noble metal mold, finishing one-time casting, slightly shaking the noble metal mold during casting, then forming in an environment of 100 plus 150 ℃, then placing in a normal temperature environment for cooling treatment, performing surface treatment, placing in an electrolytic tank again after the treatment is finished, adding electrolyte into the electrolytic tank, performing electrolysis in an environment of 40-55 ℃, and after the treatment is finished, placing in purified water again for cleaning for multiple times. The invention can improve the glossiness of the surface of the noble metal through a series of treatments on the surface of the noble metal, and can reduce the abrasion of the noble metal and improve the quality of the noble metal after long-term use.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to a noble metal processing method.
Background
The noble metal artware is a cultural creative product which is formed by taking gold, silver and other noble metals as carriers and fusing the noble metals with Chinese culture through creative design and modern technology, has bright cultural attributes and shows higher design value, process value and commemorative value. The material can be divided into pure gold products, pure silver products, gold and silver inlaid products and the like; according to the product form, the main expression forms are as follows: coins, medals, bars, bricks, three-dimensional solids, and the like. With the increasing demand for noble metal artware, the processing of the noble metal artware in the prior art cannot meet the demand, and the processed surface has insufficient glossiness. To this end, we propose a noble metal processing method.
Disclosure of Invention
The invention provides a noble metal processing method to solve the problems in the background technology.
The invention provides a noble metal processing method, which comprises the following steps:
s1: designing a blank drawing according to a noble metal product to be processed, manufacturing a noble metal die according to the blank drawing, and washing the noble metal die for multiple times so as to remove impurities on the surface of the noble metal die;
s2: polishing the inner wall of the noble metal mold treated in the step S1, wherein during polishing, diamond sand polishing and fiber wheel polishing are sequentially carried out, the polishing temperature is 60-90 ℃, and after polishing is finished, the smoothness of the inner wall needs to be ensured;
s3: then uniformly spraying a release agent on the surface of the inner wall of the mold, wherein the release agent is required to completely cover the inner wall of the noble metal mold and is placed in a sterile environment for quick drying for later use;
s4: selecting noble metal, cutting the noble metal into a plurality of small blocks, putting the cut noble metal into a smelting furnace for smelting, and filtering impurities in the solution after the noble metal is completely molten to obtain casting liquid;
s5: uniformly and slowly pouring the pouring liquid formed in the step S4 into the noble metal mold treated in the step S3, and pouring is required to be completed at one time, during pouring, the noble metal mold needs to be slightly shaken to accelerate the flow of the pouring liquid, then molding is carried out in the environment of 100-150 ℃, and after the primary molding is carried out, the casting liquid is placed in the normal temperature environment for cooling treatment;
s6: after the precious metal is recovered to normal temperature, taking out the precious metal, carrying out surface treatment, after the treatment is finished, putting the precious metal into the electrolytic cell again, adding electrolyte into the electrolytic cell, wherein the electrolyte needs to permeate the precious metal, and carrying out electrolysis in the environment of 40-55 ℃, wherein the electrolysis time is 4-7min, and the current is 6-9mA/cm2And after finishing, putting the product into purified water again for cleaning for many times, and drying to obtain the noble metal product.
Preferably, the surface treatment in S6 specifically includes the following steps:
A. placing the noble metal on a fine polishing machine again, and polishing the protruding part of the surface of the noble metal, wherein in the polishing process, the surface temperature of the noble metal is required to be not more than 100 ℃;
B. tempering the noble metal treated in the step A for 10-25s in the environment at the temperature of 150-250 ℃, then placing the noble metal in normal-temperature water, after the temperature of the noble metal is reduced to 50-65 ℃, tempering the noble metal for 5-9s in the environment at the temperature of 300-450 ℃, and then placing the noble metal in normal temperature for cooling;
and C, after the precious metal is tempered, placing the precious metal into the surface treatment pool again, adding surface treatment liquid into the surface treatment pool, wherein the surface treatment liquid needs to permeate the precious metal, then placing the precious metal for 20-35min at the temperature of 50-80 ℃, and slowly stirring the precious metal in the process.
Preferably, in S1, the precious metal mold is further preheated for 30-45 seconds in an environment of 200-300 ℃, and after completion, the precious metal mold is rapidly cooled in normal temperature water, so as to ensure the safety of use.
Preferably, when tempering is performed in B, nitrogen or ammonia gas is also introduced to protect the noble metal.
Preferably, the mold release agent in S3 is specifically a mixture of paraffin, aliphatic dibasic acid ester, smokeless sulfuric acid and an oxidizing agent, and the molar mass ratio of the paraffin, the aliphatic dibasic acid ester, the smokeless sulfuric acid and the oxidizing agent is 4: 1: 1: 0.1.
preferably, the noble metal is gold, silver, platinum or a palladium group metal.
Preferably, the surface treatment liquid is a mixture of phosphoric acid, ethanol, nitric acid, an anionic surfactant and a complexing agent, and the molar mass ratio of the phosphoric acid to the ethanol to the nitric acid to the anionic surfactant to the complexing agent is 1: 1: 2: 0.5: 0.1.
the noble metal processing method provided by the invention has the beneficial effects that: according to the noble metal processing method, the die is processed, so that the service life of the die and the demoulding efficiency can be prolonged, the quality of noble metal products is guaranteed, the glossiness of the surface of the noble metal products can be improved through a series of processing on the surface of the noble metal products in the processing process, the wear of the noble metal products can be reduced after the noble metal products are used for a long time, the quality of the noble metal products is improved, and the noble metal processing method is suitable for large-scale popularization.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
The invention provides a noble metal processing method, which comprises the following steps:
s1: designing a blank drawing according to a noble metal product to be processed, manufacturing a noble metal mold according to the blank drawing, washing the noble metal mold for multiple times to remove impurities on the surface of the noble metal mold, preheating the noble metal mold for 30s in an environment with the temperature of 200 ℃, and quickly placing the noble metal mold in normal-temperature water for cooling after the preheating is finished, so that the use safety of the noble metal mold can be ensured;
s2: polishing the inner wall of the noble metal mold treated in the step S1, wherein during polishing, diamond sand polishing and fiber wheel polishing are sequentially carried out, the polishing temperature is 60 ℃, and after polishing is finished, the smoothness of the inner wall is ensured;
s3: and then uniformly spraying a release agent on the surface of the inner wall of the mold, wherein the release agent is required to completely cover the inner wall of the noble metal mold, the release agent is specifically a mixture of paraffin, aliphatic dibasic acid ester, smokeless sulfuric acid and an oxidant, and the molar mass ratio of the paraffin to the aliphatic dibasic acid ester to the smokeless sulfuric acid to the oxidant is 4: 1: 1: 0.1, and placing the mixture in a sterile environment for quick drying for later use;
s4: selecting noble metal, wherein the noble metal is gold, silver, platinum or palladium group metal, cutting the noble metal to cut the noble metal into a plurality of small blocks, then putting the cut noble metal into a smelting furnace for smelting, and filtering impurities in the solution after the noble metal is completely molten to obtain casting liquid;
s5: uniformly and slowly pouring the pouring liquid formed in the step S4 into the noble metal mold treated in the step S3, and pouring is required to be completed at one time, during pouring, the noble metal mold needs to be slightly shaken to accelerate the flowing of the pouring liquid, then molding is carried out in the environment of 100 ℃, and after the primary molding is carried out, the noble metal mold is placed in the normal temperature environment for cooling treatment;
s6: after the precious metal is recovered to normal temperature, taking out the precious metal, carrying out surface treatment, after the treatment is finished, putting the precious metal into the electrolytic cell again, adding electrolyte into the electrolytic cell, wherein the electrolyte needs to permeate the precious metal, carrying out electrolysis in an environment of 40 ℃, wherein the electrolysis time is 4min, and the current is 6mA/cm2And after finishing, putting the product into purified water again for cleaning for many times, and drying to obtain the noble metal product.
The surface treatment in S6 includes the following steps:
A. placing the noble metal on a fine polishing machine again, and polishing the protruding part of the surface of the noble metal, wherein in the polishing process, the surface temperature of the noble metal is required to be not more than 100 ℃;
B. tempering the noble metal treated in the step A again in an environment of 150 ℃ for 10s, then placing the noble metal in normal-temperature water, after the temperature of the noble metal is reduced to 50 ℃, tempering the noble metal again in an environment of 300 ℃ for 5s, then placing the noble metal in normal temperature for cooling, and introducing nitrogen or ammonia gas into the noble metal during tempering so as to protect the noble metal;
and C, after the precious metal is tempered, placing the precious metal into the surface treatment tank again, adding a surface treatment liquid into the surface treatment tank, wherein the surface treatment liquid needs to overflow the precious metal, the surface treatment liquid is a mixture of phosphoric acid, ethanol, nitric acid, an anionic surfactant and a complexing agent, and the molar mass ratio of the phosphoric acid to the ethanol to the nitric acid to the anionic surfactant to the complexing agent is 1: 1: 2: 0.5: 0.1, and then standing for 20min at 50 ℃, wherein the noble metal needs to be slowly stirred in the process.
Example 2
The invention provides a noble metal processing method, which comprises the following steps:
s1: designing a blank drawing according to a noble metal product to be processed, manufacturing a noble metal mold according to the blank drawing, washing the noble metal mold for multiple times to remove impurities on the surface of the noble metal mold, preheating the noble metal mold for 35 seconds in an environment of 240 ℃, and quickly placing the noble metal mold in normal-temperature water for cooling after the preheating is finished, so that the use safety of the noble metal mold can be ensured;
s2: polishing the inner wall of the noble metal mold treated in the step S1, wherein during polishing, diamond sand polishing and fiber wheel polishing are sequentially carried out, the polishing temperature is 70 ℃, and after polishing is finished, the smoothness of the inner wall is ensured;
s3: and then uniformly spraying a release agent on the surface of the inner wall of the mold, wherein the release agent is required to completely cover the inner wall of the noble metal mold, the release agent is specifically a mixture of paraffin, aliphatic dibasic acid ester, smokeless sulfuric acid and an oxidant, and the molar mass ratio of the paraffin to the aliphatic dibasic acid ester to the smokeless sulfuric acid to the oxidant is 4: 1: 1: 0.1, and placing the mixture in a sterile environment for quick drying for later use;
s4: selecting noble metal, wherein the noble metal is gold, silver, platinum or palladium group metal, cutting the noble metal to cut the noble metal into a plurality of small blocks, then putting the cut noble metal into a smelting furnace for smelting, and filtering impurities in the solution after the noble metal is completely molten to obtain casting liquid;
s5: uniformly and slowly pouring the pouring liquid formed in the step S4 into the noble metal mold treated in the step S3, and pouring is required to be completed at one time, during pouring, the noble metal mold needs to be slightly shaken to accelerate the flowing of the pouring liquid, then molding is carried out in the environment of 120 ℃, and after the primary molding is carried out, the noble metal mold is placed in the normal temperature environment for cooling treatment;
s6: after the precious metal is recovered to normal temperature, taking out the precious metal, carrying out surface treatment, after the treatment is finished, putting the precious metal into the electrolytic cell again, adding electrolyte into the electrolytic cell, wherein the electrolyte needs to permeate the precious metal, carrying out electrolysis in an environment of 45 ℃, the electrolysis time is 5min, and the current is 7mA/cm2And after finishing, putting the product into purified water again for cleaning for many times, and drying to obtain the noble metal product.
The surface treatment in S6 includes the following steps:
A. placing the noble metal on a fine polishing machine again, and polishing the protruding part of the surface of the noble metal, wherein in the polishing process, the surface temperature of the noble metal is required to be not more than 100 ℃;
B. tempering the noble metal treated in the step A again at 180 ℃ for 15s, then placing the noble metal in normal-temperature water, after the temperature of the noble metal is reduced to 55 ℃, tempering the noble metal again at 350 ℃ for 6s, then placing the noble metal in normal temperature for cooling, and introducing nitrogen or ammonia gas into the noble metal during tempering so as to protect the noble metal;
and C, after the precious metal is tempered, placing the precious metal into the surface treatment tank again, adding a surface treatment liquid into the surface treatment tank, wherein the surface treatment liquid needs to overflow the precious metal, the surface treatment liquid is a mixture of phosphoric acid, ethanol, nitric acid, an anionic surfactant and a complexing agent, and the molar mass ratio of the phosphoric acid to the ethanol to the nitric acid to the anionic surfactant to the complexing agent is 1: 1: 2: 0.5: 0.1, and then standing at 60 ℃ for 25min, wherein the noble metal needs to be slowly stirred in the process.
Example 3
The invention provides a noble metal processing method, which comprises the following steps:
s1: designing a blank drawing according to a noble metal product to be processed, manufacturing a noble metal mold according to the blank drawing, washing the noble metal mold for multiple times to remove impurities on the surface of the noble metal mold, preheating the noble metal mold for 40s at 270 ℃, and quickly placing the noble metal mold in normal-temperature water for cooling after the preheating is finished so as to ensure the use safety of the noble metal mold;
s2: polishing the inner wall of the noble metal mold treated in the step S1, wherein during polishing, diamond sand polishing and fiber wheel polishing are sequentially carried out, the polishing temperature is 80 ℃, and after polishing is finished, the smoothness of the inner wall is ensured;
s3: and then uniformly spraying a release agent on the surface of the inner wall of the mold, wherein the release agent is required to completely cover the inner wall of the noble metal mold, the release agent is specifically a mixture of paraffin, aliphatic dibasic acid ester, smokeless sulfuric acid and an oxidant, and the molar mass ratio of the paraffin to the aliphatic dibasic acid ester to the smokeless sulfuric acid to the oxidant is 4: 1: 1: 0.1, and placing the mixture in a sterile environment for quick drying for later use;
s4: selecting noble metal, wherein the noble metal is gold, silver, platinum or palladium group metal, cutting the noble metal to cut the noble metal into a plurality of small blocks, then putting the cut noble metal into a smelting furnace for smelting, and filtering impurities in the solution after the noble metal is completely molten to obtain casting liquid;
s5: uniformly and slowly pouring the pouring liquid formed in the step S4 into the noble metal mold treated in the step S3, and pouring is required to be completed at one time, during pouring, the noble metal mold needs to be slightly shaken to accelerate the flowing of the pouring liquid, then molding is carried out in the environment of 140 ℃, and after the primary molding is carried out, the noble metal mold is placed in the normal temperature environment for cooling treatment;
s6: after the precious metal is recovered to normal temperature, taking out the precious metal, carrying out surface treatment, after the treatment is finished, putting the precious metal into the electrolytic cell again, adding electrolyte into the electrolytic cell, wherein the electrolyte needs to permeate the precious metal, carrying out electrolysis in an environment of 50 ℃, wherein the electrolysis time is 6min, and the current is 8mA/cm2And after finishing, putting the product into purified water again for cleaning for many times, and drying to obtain the noble metal product.
The surface treatment in S6 includes the following steps:
A. placing the noble metal on a fine polishing machine again, and polishing the protruding part of the surface of the noble metal, wherein in the polishing process, the surface temperature of the noble metal is required to be not more than 100 ℃;
B. tempering the noble metal treated in the step A again in an environment of 210 ℃ for 20s, then placing the noble metal in normal-temperature water, after the temperature of the noble metal is reduced to 60 ℃, tempering the noble metal again in an environment of 400 ℃ for 8s, then placing the noble metal in normal temperature for cooling, and introducing nitrogen or ammonia gas into the noble metal during tempering so as to protect the noble metal;
and C, after the precious metal is tempered, placing the precious metal into the surface treatment tank again, adding a surface treatment liquid into the surface treatment tank, wherein the surface treatment liquid needs to overflow the precious metal, the surface treatment liquid is a mixture of phosphoric acid, ethanol, nitric acid, an anionic surfactant and a complexing agent, and the molar mass ratio of the phosphoric acid to the ethanol to the nitric acid to the anionic surfactant to the complexing agent is 1: 1: 2: 0.5: 0.1, and then standing at 70 ℃ for 30min, wherein the noble metal needs to be slowly stirred in the process.
Example 4
The invention provides a noble metal processing method, which comprises the following steps:
s1: designing a blank drawing according to a noble metal product to be processed, manufacturing a noble metal mold according to the blank drawing, washing the noble metal mold for multiple times to remove impurities on the surface of the noble metal mold, preheating the noble metal mold in an environment of 300 ℃ for 45s, and quickly placing the noble metal mold in normal-temperature water for cooling after the preheating is finished, so that the use safety of the noble metal mold can be ensured;
s2: polishing the inner wall of the noble metal mold treated in the step S1, wherein during polishing, diamond sand polishing and fiber wheel polishing are sequentially carried out, the polishing temperature is 90 ℃, and after polishing is finished, the smoothness of the inner wall is ensured;
s3: and then uniformly spraying a release agent on the surface of the inner wall of the mold, wherein the release agent is required to completely cover the inner wall of the noble metal mold, the release agent is specifically a mixture of paraffin, aliphatic dibasic acid ester, smokeless sulfuric acid and an oxidant, and the molar mass ratio of the paraffin to the aliphatic dibasic acid ester to the smokeless sulfuric acid to the oxidant is 4: 1: 1: 0.1, and placing the mixture in a sterile environment for quick drying for later use;
s4: selecting noble metal, wherein the noble metal is gold, silver, platinum or palladium group metal, cutting the noble metal to cut the noble metal into a plurality of small blocks, then putting the cut noble metal into a smelting furnace for smelting, and filtering impurities in the solution after the noble metal is completely molten to obtain casting liquid;
s5: uniformly and slowly pouring the pouring liquid formed in the step S4 into the noble metal mold treated in the step S3, and pouring is required to be completed at one time, during pouring, the noble metal mold needs to be slightly shaken to accelerate the flowing of the pouring liquid, then molding is carried out in the environment of 150 ℃, and after the primary molding is carried out, the noble metal mold is placed in the normal temperature environment for cooling treatment;
s6: after the precious metal is recovered to normal temperature, taking out the precious metal, carrying out surface treatment, after the treatment is finished, putting the precious metal into the electrolytic cell again, adding electrolyte into the electrolytic cell, wherein the electrolyte needs to permeate the precious metal, carrying out electrolysis in an environment of 55 ℃, wherein the electrolysis time is 7min, and the current is 9mA/cm2And after finishing, putting the product into purified water again for cleaning for many times, and drying to obtain the noble metal product.
The surface treatment in S6 includes the following steps:
A. placing the noble metal on a fine polishing machine again, and polishing the protruding part of the surface of the noble metal, wherein in the polishing process, the surface temperature of the noble metal is required to be not more than 100 ℃;
B. b, tempering the noble metal treated in the step A for 25s at the temperature of 250 ℃ again, then placing the noble metal in normal-temperature water, after the temperature of the noble metal is reduced to 65 ℃, tempering the noble metal for 9s at the temperature of 450 ℃, then placing the noble metal in normal temperature for cooling, and introducing nitrogen or ammonia gas into the noble metal during tempering so as to protect the noble metal;
and C, after the precious metal is tempered, placing the precious metal into the surface treatment tank again, adding a surface treatment liquid into the surface treatment tank, wherein the surface treatment liquid needs to overflow the precious metal, the surface treatment liquid is a mixture of phosphoric acid, ethanol, nitric acid, an anionic surfactant and a complexing agent, and the molar mass ratio of the phosphoric acid to the ethanol to the nitric acid to the anionic surfactant to the complexing agent is 1: 1: 2: 0.5: 0.1, and then standing at 80 ℃ for 35min, wherein the noble metal needs to be slowly stirred in the process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A noble metal processing method is characterized by comprising the following steps:
s1: designing a blank drawing according to a noble metal product to be processed, manufacturing a noble metal mold according to the blank drawing, washing the noble metal mold for multiple times to remove impurities on the surface of the noble metal mold, preheating the noble metal mold in an environment of 200-300 ℃ for 30-45S in S1, and quickly placing the noble metal mold in normal-temperature water for cooling after the preheating is finished so as to ensure the use safety of the noble metal mold;
s2: polishing the inner wall of the noble metal mold treated in the step S1, sequentially performing diamond sand polishing and fiber wheel polishing at 60-90 ℃, and ensuring the smoothness of the inner wall after polishing;
s3: and then uniformly spraying a release agent on the surface of the inner wall of the mold, wherein the release agent needs to completely cover the inner wall of the noble metal mold, and the noble metal mold is placed in an aseptic environment for quick drying for later use, the release agent in S3 is specifically a mixture of paraffin, aliphatic dibasic acid ester, smokeless sulfuric acid and an oxidant, and the molar mass ratio of the paraffin, the aliphatic dibasic acid ester, the smokeless sulfuric acid and the oxidant is 4: 1: 1: 0.1;
s4: selecting noble metal, cutting the noble metal into a plurality of small blocks, then putting the cut noble metal into a smelting furnace for smelting, and filtering impurities in the molten liquid after the noble metal is completely molten to obtain casting liquid, wherein the noble metal is gold, silver, platinum or palladium group metal;
s5: uniformly and slowly pouring the pouring liquid formed in the step S4 into the noble metal mold treated in the step S3, and finishing pouring in one step, slightly shaking the noble metal mold during pouring so as to accelerate the flow of the pouring liquid, then molding in an environment of 100-150 ℃, and after primary molding, placing the noble metal mold in a normal temperature environment for cooling treatment;
s6: after the precious metal is recovered to normal temperature, taking out the precious metal, carrying out surface treatment, after the treatment is finished, putting the precious metal into an electrolytic cell, adding electrolyte into the electrolytic cell, wherein the electrolyte needs to permeate the precious metal, and carrying out electrolysis in the environment of 40-55 ℃, wherein the electrolysis time is 4-7min, and the current is 6-9mA/cm2And after finishing, putting the noble metal product into purified water for cleaning for multiple times, and drying to obtain a noble metal product, wherein the surface treatment in S6 comprises the following specific steps:
A. placing the noble metal on a fine polishing machine, and polishing the protruding part of the surface of the noble metal, wherein the surface temperature of the noble metal is not more than 100 ℃ in the polishing process;
B. tempering the noble metal treated in the step A in an environment of 150-250 ℃, then placing the noble metal in normal-temperature water, after the temperature is reduced to 50-65 ℃, then placing the noble metal in an environment of 300-450 ℃ for tempering for 5-9s, then placing the noble metal in normal temperature for cooling, and introducing nitrogen or ammonia gas when tempering is carried out in the step B, thereby protecting the noble metal;
c, after the precious metal is tempered, placing the precious metal in a surface treatment pool, adding a surface treatment liquid into the surface treatment pool, wherein the surface treatment liquid needs to permeate the precious metal, then placing the precious metal for 20-35min at 50-80 ℃, slowly stirring the precious metal in the process, wherein the surface treatment liquid is a mixture of phosphoric acid, ethanol, nitric acid, an anionic surfactant and a complexing agent, and the molar mass ratio of the phosphoric acid to the ethanol to the nitric acid to the anionic surfactant to the complexing agent is 1: 1: 2: 0.5: 0.1.
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| CN1087134A (en) * | 1992-11-16 | 1994-05-25 | 长治清华机械厂 | Quick-acting film stripping agent |
| CN101988194A (en) * | 2010-11-18 | 2011-03-23 | 平湖市供电局 | Site rust-removing and corrosion-preventing method for steel piece of electric power system |
| CN102228330A (en) * | 2011-04-25 | 2011-11-02 | 深圳市金佳和珠宝有限公司 | Method for processing noble metal |
| FR3035347B1 (en) * | 2015-04-21 | 2017-12-22 | Orelec | PROCESS FOR PRODUCING A THERMOFORMING MOLD, A ROTOMOLDING MOLD |
| CN106521594A (en) * | 2016-11-25 | 2017-03-22 | 深圳市福麒珠宝首饰有限公司 | Processing method and device for processing K gold into gold natural color |
| CN108048837A (en) * | 2017-12-18 | 2018-05-18 | 温州瑞榕汽车零部件制造有限公司 | A kind of die casting surface processing technique |
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