Citric acid gold potassium for gilding and preparation method thereof

A technology of gold potassium citrate and potassium citrate, which is applied in the field of gold-plated potassium citrate and its preparation, and can solve problems such as seldom use, high toxicity, and excessive potassium cyanide content

Inactive Publication Date: 2010-03-17
HENGSHENG TECH R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In alkaline cyanide gold plating, the auxiliary materials are potassium cyanide, potassium carbonate, and potassium dihydrogen phosphate. Because the content of potassium cyanide in the electroplating solution of this gold plating process is too high and the toxicity is high, most enterprises do not use it much.

Method used

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  • Citric acid gold potassium for gilding and preparation method thereof
  • Citric acid gold potassium for gilding and preparation method thereof
  • Citric acid gold potassium for gilding and preparation method thereof

Examples

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Embodiment 1

[0031] Example 1 : At normal temperature and pressure, add 10000mL water into the reactor, turn on the stirrer and the heating switch, and when the water temperature rises to 85°C, add 500g of gold trichloride under stirring conditions to make it dissolve completely; The above-mentioned gold trichloride solution is kept at a temperature of 85°C under stirring conditions, and concentrated for 4 hours. When the volume is 2000mL, add water to the reactor to 10000mL. Under the same conditions, when it is concentrated to 2000mL, add Water to 10,000mL; keep the above gold trichloride solution at 85°C, take 800g of potassium citrate, dissolve it in 20,000mL of 85°C hot water, filter to remove trace impurities in the solution, and add the prepared potassium citrate solution into the reactor During the process, measure the pH value while adding, and stop adding potassium citrate solution dropwise when the pH value is adjusted to 5; take 50g of ethylenediaminetetraacetic acid, dissolve...

Embodiment 2

[0032] Example 2 : At normal temperature and pressure, add 10000mL water into the reactor, turn on the stirrer and the heating switch, when the water temperature rises to 80°C, add 400g of gold trichloride under stirring conditions to make it dissolve completely; The above-mentioned gold trichloride solution is kept at a temperature of 80°C under stirring conditions, and concentrated for 10 hours. When the volume is 2000mL, add water to the reactor to 10000mL. Under the same conditions, when it is concentrated to 2000mL, add Water to 10000mL; keep the above gold trichloride solution at 80°C, take 1200g of potassium citrate, dissolve it in 20000mL of 80°C hot water, filter to remove trace impurities in the solution, and add the prepared potassium citrate solution into the reactor During the process, measure the pH value while adding, and stop adding potassium citrate solution dropwise when the pH value is adjusted to 7; take 60g of ethylenediaminetetraacetic acid, dissolve it ...

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Abstract

The invention relates to citric acid gold potassium for gilding and a preparation method thereof. The molecular formula of the citric acid gold potassium is KAu2N4C12H11O8. The citric acid gold potassium is prepared by dissolving auric chloride in water, concentrating and diluting for several times, and reacting the obtained liquid with sodium potassium, edetic acid and malononitrile in a reactor.The citric acid gold potassium has the advantages of low toxicity and no free cyanogens in the product. Compared with gold potassium cyanide, the total CN<-> content of the citric acid gold potassiumis 5-6 percent in case of the same gold content, and is above 50 percent lower than that in the gold potassium cyanide. The waste liquid after gilding only contains the micro-free CN<->, thereby thewaste water processing cost in electroplating enterprises is reduced.

Description

technical field [0001] The invention relates to a gold citrate gold salt for gold plating, in particular to a gold potassium citrate for gold plating and a preparation method thereof. Background technique [0002] In the gold plating industry, because potassium cyanide has a strong complexing force on gold ions, most enterprises in my country choose inorganic electroplating gold salt——potassium aurous cyanide as the main salt of gold plating during electroplating. The corrosion resistance of the workpiece and the characteristics of the coating and the plated parts are then formulated with an acidic gold plating or alkaline gold plating solution to meet the requirements of the process conditions. [0003] National Defense Industry Press published the first edition in June 1990, and the book "Practical Electroplating Process" edited by Li Hongnian, Zhang Shaogong, Zhang Bingqian, Song Ziyu, etc., which was printed for the second time in November 1993, introduced the gold platin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/48
Inventor 张群刚
Owner HENGSHENG TECH R&D CO LTD
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