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Lemon acid gold salt for gold plating and manufacture method thereof

A gold citrate and citric acid technology, applied in the chemical field, can solve the problems of high potassium cyanide content, high toxicity, and limited use, and achieve the effect of reducing wastewater treatment costs and pollution

Inactive Publication Date: 2008-08-27
HENGSHENG TECH R&D CO LTD
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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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  • Lemon acid gold salt for gold plating and manufacture method thereof
  • Lemon acid gold salt for gold plating and manufacture method thereof
  • Lemon acid gold salt for gold plating and manufacture method thereof

Examples

Experimental program
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Embodiment Construction

[0016] The molecular formula of auramine citrate for gold plating is: K 3 Au 2 C 9 h 5 o 7 N 2 , the structural formula is:

[0017]

[0018] Calculated by preparing 1000g of citrate gold salt.

[0019] Example 1, at normal temperature and pressure, add 10000mL of water into the reactor, turn on the stirrer and heating switch, and when the temperature of the water rises to 85°C, add 500g of gold trichloride under stirring conditions to make it completely dissolve With the above-mentioned gold trichloride solution under stirring conditions, keep the temperature at 85°C, concentrate for 4 hours, when the volume is 2000mL, add water to the reactor to 10000mL, and then concentrate to 2000mL under the same conditions, Add water to 10000mL; keep the above-mentioned gold trichloride solution at 85°C, take 800g of potassium citrate, dissolve it in 20000mL of 85°C hot water, filter to remove trace impurities in the solution, and add the prepared potassium citrate solution to ...

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Abstract

The invention discloses citric acid gold salt used for plating gold and a method for preparing the citric acid gold salt, the molecular formula of the citric acid gold salt is K3Au2C9H5O7N2, and the method comprises the following steps: dissolving gold trichloride in water with certain temperature, then concentrating and diluting the gold trichloride time after time under the temperature, and preparing and obtaining organometallic salt through reacting with potassium citrate, EDTA and thiocyanate amine in certain temperature and time in a catalyst case. The citric acid gold salt has the advantages that the toxicity is low, the discharge liquid after the gold plating only contains trace quantity free CN-, the cost of treating waste water of electroplating enterprises is reduced, and the pollution to environment of discharging of cyanide is originally reduced.

Description

technical field [0001] The invention relates to a gold salt for gold plating, in particular to a gold citrate salt for gold plating, and also relates to a preparation method of the gold citrate salt, which belongs to the technical field of chemistry. Background technique [0002] In the gold plating industry, due to the strong complexing force of potassium cyanide on gold ions, most enterprises in my country choose the inorganic electroplating gold salt—potassium gold cyanide as the main salt of gold plating during electroplating. According to the corrosion resistance and the characteristics of the coating and the plated parts, the acid gold plating or alkaline gold plating solution is prepared 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 secon...

Claims

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Application Information

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IPC IPC(8): C25D3/48
Inventor 张群刚
Owner HENGSHENG TECH R&D CO LTD
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