Hard gold cyanide-free electroforming solution as well as preparation method and electroforming process thereof

A technology of electroforming liquid and gold, applied in electroforming, electrolysis process, etc., can solve the problems of difficult to guarantee the thickness uniformity of electroforming layer, poor weldability of electroforming layer, unstable current efficiency, etc. Strong, good flatness, the effect of eliminating pinholes and pits

Pending Publication Date: 2022-07-15
深圳市缤纷珠宝开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are mainly two types of electrolytes for the production of 3D hard gold. One is cyanide-containing electrolytes. This type of electrolyte has been relatively stable for many years, with high stability, high utilization rate, high recovery rate, and better bonding force of the coating. advantages, but it is also prone to unstable current efficiency. The entire production cycle is long, about 16-20h, but cyanide is highly toxic. During production, storage and transportation, it will cause serious damage to the environment and staff. Threat, at the same time, the hardness of cyanide-containing electroforming products is low, and the brightness is not high enough
The other is cyanide-free electrolyte, the main process of which is sulfite system, which has good electrolyte dispersion, covering ability and deep plating ability, but due to the instability of the plating solution, the oxygen generated by the anode or the oxygen in the air Oxygen is easy to oxidize the sulfite ion in the solution, so that the granular gold is precipitated
The power source used in the existing electroforming technology for the production of 3D hard gold is basically a DC power source. Only one parameter of current density is controlled, and the controllability is poor. Therefore, it is difficult to ensure the uniformity of the thickness of the electroforming layer, especially in electroforming. When casting products with complex geometric shapes and various styles, the positioning performance of edges, tips, and pits is lacking, and the weldability of the electroformed layer is poor

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  • Hard gold cyanide-free electroforming solution as well as preparation method and electroforming process thereof
  • Hard gold cyanide-free electroforming solution as well as preparation method and electroforming process thereof
  • Hard gold cyanide-free electroforming solution as well as preparation method and electroforming process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The formula of hard gold cyanide-free electroforming fluid is as follows:

[0045] 8g / L gold sodium sulfite, 70g / L sodium sulfite, 30g / L dipotassium hydrogen phosphate, 0.5g / L EDTA-2Na, 0.05g / L sodium tellurite, 0.05g / L pyridinesulfonic acid, 1g / L saccharin and 0.01g / L sodium dibutylnaphthalene sulfonate

[0046] The preparation method is as follows:

[0047](1) Place the weighed 70 g of anhydrous sodium sulfite and 30 g of dipotassium hydrogen phosphate into a beaker, add an appropriate amount of deionized water and stir to a paste.

[0048] (2) Weigh 0.5 g of EDTA-2Na into the beaker, and stir evenly.

[0049] (3) Pipette an appropriate amount of prepared sodium gold sulfite solution into a beaker, and stir until all solids in the solution are dissolved.

[0050] (4) Mix 0.05 g of sodium tellurite, 0.05 g of pyridine sulfonic acid, 1 g of saccharin, and 0.01 g of sodium dibutylnaphthalene sulfonate with warm water at about 50° C., and pour into the beaker after ful...

Embodiment 2

[0055] The formula of electroforming fluid is as follows:

[0056] 10g / L gold sodium sulfite, 100g / L sodium sulfite, 50g / L dipotassium hydrogen phosphate, 2g / L EDTA-2Na, 1g / L sodium tellurite, 1g / L pyridinesulfonic acid, 5g / L saccharin and 5g / L Sodium dibutylnaphthalene sulfonate

[0057] The preparation method is as follows:

[0058] (1) Place the weighed 100 g of anhydrous sodium sulfite and 50 g of dipotassium hydrogen phosphate in a beaker, add an appropriate amount of deionized water and stir to a paste.

[0059] (2) Weigh 2g of EDTA-2Na into the beaker and stir evenly.

[0060] (3) Pipette an appropriate amount of prepared sodium gold sulfite solution into a beaker, and stir until all solids in the solution are dissolved.

[0061] (4) Mix 2 g of sodium tellurite, 2 g of pyridine sulfonic acid, 5 g of saccharin and 5 g of sodium dibutylnaphthalene sulfonate with warm water at about 50°C, fully dissolve and cool, and pour into the beaker.

[0062] (5) Adjust the pH of ...

Embodiment 3

[0066] The formula of electroforming fluid is as follows:

[0067] 10g / L gold sodium sulfite, 100g / L sodium sulfite, 40g / L dipotassium hydrogen phosphate, 1g / L EDTA-2Na, 0.2g / L sodium tellurite, 0.2g / L pyridinesulfonic acid, 1g / L saccharin and 2g / L sodium dibutylnaphthalene sulfonate

[0068] The preparation method is as follows:

[0069] (1) Place 100 g of anhydrous sodium sulfite and 40 g of dipotassium hydrogen phosphate weighed into a beaker, add an appropriate amount of deionized water and stir until it becomes a paste.

[0070] (2) Weigh 1 g of EDTA-2Na into the beaker and stir evenly.

[0071] (3) Pipette an appropriate amount of prepared sodium gold sulfite solution into a beaker, and stir until all solids in the solution are dissolved.

[0072] (4) Mix 0.2 g of sodium telluride, 0.2 g of pyridine sulfonic acid, 1 g of saccharin and 2 g of sodium dibutylnaphthalene sulfonate with warm water at about 50°C, and pour into the beaker after fully dissolving and cooling....

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Abstract

The invention discloses a hard gold cyanide-free electroforming solution which is characterized in that sodium gold sulfite is a main salt and provides the most important gold element in a formula; sodium sulfite and EDTA-2Na are auxiliary complexing agents and have the effects of maintaining the stability of sulfite radicals and preventing gold from being separated out in the transportation or electroforming process; the sodium tellurate is a hardening agent and is used for enhancing the hardness of the electroformed layer and providing a brightening effect; pyridine sulfonic acid and saccharin are brighteners and cooperate to make the surface of the electroformed layer brighter and smoother; the nekal is a wetting agent and can accelerate escape of hydrogen and eliminate pinholes and pits of an electroforming layer. The electroforming solution is odorless and high in stability, and can be placed at normal temperature for 300 days. And electroforming is carried out in combination with a rotating cathode double-pulse technology, so that cathode polarization is improved, concentration polarization is reduced, adverse effects of a cathode hydrogen evolution reaction on a product are reduced, the deposition rate of gold is increased, the current efficiency is improved, and an electroformed hard gold product with high brightness, high purity, good flatness, high weldability and stable hardness is obtained.

Description

technical field [0001] The invention relates to the field of electroforming technology, in particular to a hard gold cyanide-free electroforming liquid, a preparation method and an electroforming process. Background technique [0002] There are mainly two types of electrolytes for the production of 3D hard gold. One is cyanide-containing electrolytes. This type of electrolytes has been relatively stable in development for many years, with high stability, high utilization rate, high recovery rate, and good coating adhesion. However, it is also prone to unstable current efficiency. The entire production cycle is long, about 16-20 hours, but cyanide is highly toxic. During production, storage and transportation, it will cause serious damage to the environment and staff. At the same time, the hardness of cyanide-containing electroforming products is low, and the brightness is not high enough. The other type is cyanide-free electrolyte, in which the main process is sulfite syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/00C25D3/48
CPCC25D1/00C25D3/48
Inventor 曾子明葛文李志刚邓柏依王美皎罗学维崔淏
Owner 深圳市缤纷珠宝开发有限公司
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