Electroforming solution for gold cyanide-free electroforming process and electroforming process

An electroforming solution and electroforming technology, applied in the direction of electroforming and electrolysis, can solve problems such as soft surface collapse, pinholes in pores, and brittle fracture, etc., and achieve the effect of prolonging the life of the casting solution and ensuring stability

Pending Publication Date: 2021-06-29
DECENT GOLD GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is to provide an electroforming solution for the gold cyanide-free electroforming process. Casting products have high-frequency problems such as brittle fracture, soft surface collapse, interlayer peeling, pitting and sanding, and pinholes in pores.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: A kind of gold cyanide-free electroforming process

[0047] 1. The composition content of the electroforming liquid used in the gold cyanide-free electroforming process is as follows: taking 1 liter of solution as a unit, including 25 grams / liter of gold chloride gold salt, 60 grams / liter of anhydrous sodium sulfite, chlorine 50 grams / liter of sodium chloride, 25 grams / liter of hardening agent with a concentration of 0.1mol / L, 0.6 grams / liter of anhydrous sodium saccharin, 0.0125 grams / liter of tellurium dioxide, ammonia and phosphoric acid, and the concentration of the ammonia is diluted to 15wt % below, under the situation of constantly stirring the electroforming solution, slowly pour into the above solution; after the phosphoric acid concentration is diluted to below 15wt%, slowly pour into the above solution while stirring; The pH value is between 9.2-9.8; and the gold content mass fraction of the gold raw material used to prepare the gold chloride go...

Embodiment 2

[0053] Embodiment 2: A kind of gold cyanide-free electroforming process

[0054] 1. The composition content of the electroforming liquid used in the gold cyanide-free electroforming process is as follows: taking 1 liter of solution as a unit, including 30 grams / liter of gold chloride gold salt, 80 grams / liter of anhydrous sodium sulfite, chlorine 70 grams / liter of sodium chloride, 30 grams / liter of hardening agent with a concentration of 0.1mol / L, 0.55 grams / liter of anhydrous saccharin sodium, 0.0138 grams / liter of tellurium dioxide, ammonia and phosphoric acid, and the concentration of the ammonia is diluted to 15wt % below, under the situation of constantly stirring the electroforming solution, slowly pour into the above-mentioned solution; after the phosphoric acid concentration is diluted to below 15wt%, under the situation of constantly stirring the electroforming solution, slowly pour into the above-mentioned solution; control The pH value of the electroforming solution...

Embodiment 3

[0060] Embodiment 3: A kind of gold cyanide-free electroforming process

[0061] 1. The composition content of the electroforming liquid used in the gold cyanide-free electroforming process is as follows: taking 1 liter of solution as a unit, including 27 grams / liter of gold chloride gold salt, 70 grams / liter of anhydrous sodium sulfite, chlorine 60 grams / liter of sodium chloride, 27 grams / liter of hardening agent with a concentration of 0.1mol / L, 0.5 grams / liter of anhydrous sodium saccharin, 0.015 grams / liter of tellurium dioxide, ammonia and phosphoric acid, and the concentration of the ammonia is diluted to 15wt % below, under the situation of constantly stirring the electroforming solution, slowly pour into the above-mentioned solution; after the phosphoric acid concentration is diluted to below 15wt%, under the situation of constantly stirring the electroforming solution, slowly pour into the above-mentioned solution; control The pH value of the electroforming solution i...

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PUM

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Abstract

The invention provides an electroforming solution for a gold cyanide-free electroforming process and an electroforming process. 1 liter of the electroforming solution comprises 25-30 g of gold chloride gold salt, 60-80 g of anhydrous sodium sulfite, 50-70 g of sodium chloride, a hardening agent, anhydrous saccharin sodium salt, tellurium dioxide, ammonia water and phosphoric acid, wherein a mass ratio of an addition amount of the hardening agent to an addition amount of gold trichloride gold salt is 1: 1, and a mass ratio of an addition amount of the anhydrous saccharin sodium salt to an addition amount of the gold chloride gold salt is 1: (45-55). The process comprises the following steps of taking a wax mold as an electroforming model, and conducting copper plating after silver oil soaking, so as to plate the wax mold with a bright copper coating; conducting electrolytic degreasing, acid pickling activation and water washing deacidification; and conducting gold electroforming through the electroforming solution, and removing a mold core of the electroforming model after electroforming, so as to obtain a gold product. According to the electroforming solution and the electroforming process, an electroforming liquid system is stable, the service life is long, and the high-frequency problems of brittle fracture, soft surface collapse, interlayer peeling, hard spots and roughing, pores and needle holes and the like of products cast by an existing similar sulfite casting liquid system are solved.

Description

【Technical field】 [0001] The invention relates to an electroforming liquid used in a gold cyanide-free electroforming process and the electroforming process thereof. 【Background technique】 [0002] The use of electroforming technology in the manufacture of gold jewelry is a popular direction for the development of gold jewelry in recent years. Electroformed gold jewelry has the characteristics of light, thin and soft, and is often used in decorative ornaments and other handicrafts. As jewelry accessories, it has the disadvantages of being easily deformed and not wear-resistant. In recent years, through the improvement of key technologies such as electroforming process and electroforming liquid ratio, the hard gold electroforming process has been greatly developed, and the problem of soft and non-wearable electroformed gold jewelry has been solved. The traditional electroforming gold process uses mostly cyanide-containing compounds as raw materials. Cyanide, as a highly toxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/00
CPCC25D1/00
Inventor 唐世勇
Owner DECENT GOLD GRP CO LTD
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