Non-cyanide gold plating bath and preparation method and application thereof

A technology of cyanide-free gold plating and gold-plating solution, which is applied in the field of gold-plating solution, and can solve problems such as poor stability of current efficiency and poor stability of cyanide-free gold-plating solution

Active Publication Date: 2019-06-14
SHENZHEN UNITED BLUEOCEAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of cyanide-free gold-plating solution and its preparation method and the cyanide-free gold-plating solution in order to overcome the poor stability of cyanide-free gold-plating solution in the prior art and the problem of poor stability of current efficiency within a certain current density range Application in the preparation of gold products, the cyanide-free gold plating solution has the characteristics of good stability of the plating solution and high stability of current efficiency within a certain current density range

Method used

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  • Non-cyanide gold plating bath and preparation method and application thereof
  • Non-cyanide gold plating bath and preparation method and application thereof
  • Non-cyanide gold plating bath and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] At 60°C, dissolve gold sodium sulfite, 75g sodium sulfite, 5g 3-nitrobenzoate, 24g ethylenediamine and 45g 98% by weight sulfuric acid in deionized water for 20min at 60°C. Prepare 1 L of cyanide-free gold-plating solution S1 with a pH value of 7.2, and use the cyanide-free gold-plating solution S1 to electroplate on a Hall cell test piece to form a coating with a thickness of 120 μm.

[0044] During the electroplating process, adjust the current density at 0.2-0.6A / dm 2 During the period, the current efficiency remained stable and greater than 98%; the surface of the product was smooth and uniform in color; and after 10 MTO productions, the cyanide-free gold plating solution S1 was still stable, and no turbidity or gold precipitation occurred.

Embodiment 2

[0046] At 55°C, gold ammonium sulfite of 16g, ammonium sulfite of 60g, sodium 3-nitrobenzoate of 8g, propylenediamine of 30g and sulfuric acid of 98% by weight of 71.4g were dissolved in Prepare 1 L of cyanide-free gold plating solution S2 with a pH value of 7 in deionized water at a constant temperature for 30 minutes, and use cyanide-free gold plating solution S2 to electroplate on the Hall cell test piece to form a coating with a thickness of 120 μm.

[0047] During the electroplating process, adjust the current density at 0.2-0.6A / dm 2 During the period, the current efficiency remained stable and was greater than 96%; the surface of the product was smooth and the color was uniform; and after 10 MTO productions, the cyanide-free gold plating solution S2 was still stable, and no turbidity or gold precipitation occurred.

Embodiment 3

[0049] At 65°C, ethylenediamine hydrochloride with a gold element content of 8g, 100g of sodium sulfite, 3g of 3-nitrobenzoic acid sodium, 15g of ethylenediamine hydrochloride and 20.5g of 98% by weight Sulfuric acid was dissolved in deionized water at a constant temperature for 15 minutes to prepare 1 L of cyanide-free gold plating solution S3 with a pH value of 7.5, and the cyanide-free gold plating solution S3 was used to electroplate on the Hall cell test piece to form a coating with a thickness of 120 μm.

[0050] During the electroplating process, adjust the current density at 0.2-0.6A / dm 2 During the period, the current efficiency remained stable and was greater than 96%; the surface of the product was smooth and the color was uniform; and after 10 MTO productions, the cyanide-free gold plating solution S3 was still stable, and no turbidity or gold precipitation occurred.

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Abstract

The invention relates to the field of gold plating baths, in particular to a non-cyanide gold plating bath and a preparation method and application thereof. The gold plating bath comprises a sulphurous acid gold salt, sulfite, 3-nitrobenzoic acid salt, organic amine and acid. The non-cyanide gold bath has the advantages that the plating bath stability is good, and the current efficiency stabilitywithin a certain current density range is high.

Description

technical field [0001] The invention relates to the field of gold-plating solutions, in particular to a cyanide-free gold-plating solution, a preparation method thereof and an application of the cyanide-free gold-plating solution in preparing gold products. Background technique [0002] Gold-plated products have good brightness and chemical stability, and are widely welcomed by consumers. The traditional gold plating process usually adopts cyanide gold plating process. Although the plating solution is stable, cyanide is extremely toxic, and strict safety measures need to be taken during production and use. [0003] Cyanide-free gold plating solution is gradually replacing cyanide-containing gold plating solution due to its safety and stable plating solution. At present, the cyanide-free gold plating solution system mainly includes: sulfite gold plating solution, thiosulfate gold plating solution, succinimide Gold plating solution and hydantoin gold plating solution. But th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48
Inventor 邓川
Owner SHENZHEN UNITED BLUEOCEAN TECH DEV
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