A kind of nontoxic gold-plated gold salt and its synthetic method

A synthesis method and technology of gold salt, applied in the field of electroplating gold, can solve the problems of poor wear resistance of the coating, toxicity of malononitrile, and high cost of the plating solution, and achieve the effects of stable performance, strong adhesion and corrosion protection.

Inactive Publication Date: 2017-04-19
苏州晶拓生物医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the wear resistance of the coating is poor, and the cost of the plating solution is high
The disadvantage of this method is that the preparation of raw material malononitrile has certain toxicity and the waste liquid after gold plating still contains a certain amount of CN -

Method used

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  • A kind of nontoxic gold-plated gold salt and its synthetic method

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preparation example Construction

[0035] see figure 1 , figure 1 It is a schematic flow chart of the method for synthesizing a gold salt for non-toxic gold plating of the present invention. The synthetic method of gold salt for nontoxic gold plating of the present invention comprises the following steps:

[0036] Step S1: adding gold trichloride to water at 10-100° C. under stirring until the gold trichloride is completely dissolved;

[0037] Step S2: adding a strong alkali solution to the aqueous solution of gold trichloride to adjust the pH value of the mixed solution to 7.5-14; in this step S2, the reaction equation is: That is, AuO - 2 mixed solution.

[0038] Step S3: Add a reducing agent solution with a concentration of 0.1mol / L to 10mol / L and a complexing agent solution with a concentration of 1.0mol / L to 10mol / L respectively into the mixed solution, stir well, and adjust the pH value of the solution From 1 to 7, a clear and transparent solution was obtained.

[0039] In this step, the reducing ...

Embodiment 1

[0067] Add 1.0L deionized water into the reaction vessel, turn on the stirring and heating device, raise the temperature to 10°C, add 20g of gold trichloride after the temperature stabilizes, and keep stirring until the gold trichloride is completely dissolved; 16.8g KOH, dissolve it in 3L of water at 10°C to prepare a KOH solution, slowly add it dropwise to the above-mentioned gold trichloride solution, measure the pH value while adding, and adjust the pH value to 7.5; In water heated to 10°C, add 97.32g of potassium citrate and 339g of NCCH with stirring 2 COOCH 2 CH 3 , to be completely dissolved to obtain a concentration of 0.1mol / L potassium citrate solution and a concentration of 1.0mol / L NCCH 2 COOCH 2 CH 3 solution; the above potassium citrate solution and NCCH 2 COOCH 2 CH 3 The solution was slowly added dropwise to the above solution, and the pH value was adjusted to 1 to obtain a clear and transparent solution; the above obtained container containing the clea...

Embodiment 2

[0069] Add 1.5L deionized water into the reaction vessel, turn on the stirring and heating device, raise the temperature to 40°C, add 35g of gold trichloride after the temperature stabilizes, and keep stirring until the gold trichloride is completely dissolved; Dissolve 336g KOH in 3L water at 40°C to prepare KOH solution, slowly add it dropwise to the above-mentioned gold trichloride solution, measure the pH value while adding, and adjust the pH value to 9; heat in 3L To water at 40°C, add 52.84g ascorbic acid and 1395g NC (CH 2 ) 2 COO(CH 2 ) 3 CH 3 , to be completely dissolved to obtain a concentration of 0.1mol / L ascorbic acid solution and a concentration of 3.0mol / L NC (CH 2 ) 2 COO(CH 2 ) 3 CH 3 solution, the above ascorbic acid solution and NC (CH 2 ) 2 COO(CH 2 ) 3 CH 3 The solution was slowly added dropwise to the above solution, and the pH value was adjusted to 3 to obtain a clear and transparent solution; the above obtained container containing the clea...

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Abstract

The invention discloses a non-toxic gold salt for gold plating and a synthetic method thereof. The method comprises the following steps of: (S1) adding gold chloride into 10 to 100 DEG C water while stirring; (S2) adding strong base solution into the gold chloride water solution; (S3) respectively adding a reducing agent solution and a coordination agent solution into the mixed solution, so as to obtain a clear and transparent solution, wherein the concentration of the reducing agent solution is 0.1-10mol / L, and the concentration of the coordination agent solution is 1.0-10 mol / L; and (S4) cooling the clear and transparent solution obtained in the step (S3) to 20 DEG C below zero-10 DEG C in a cooling container, adding the strong base solution into the cooled solution to separate crystal sediments out of the solution, continuously maintaining the temperature of the solution for 6-48 hours at the cooling temperature to adequately separate the crystal sediments out, and drying, thus obtaining the non-toxic gold salt for the gold plating. The non-toxic gold salt for the gold plating is nontoxic and environment-friendly and is stable in performance; and the coating of the non-toxic gold salt is has strong adhesion to different matrixes and can effectively protect the matrixes from being corroded by the external environment.

Description

technical field [0001] The invention relates to the technical field of gold electroplating, in particular to a nontoxic gold salt for gold plating and a synthesis method thereof. Background technique [0002] my country's economy has been growing rapidly, and the center of the world's manufacturing and processing industries is shifting to my country. Electroplating technology not only plays an important role in traditional industries, but also plays an important role in high-tech industries, such as modern electronic technology, microelectronic technology, communication technology and products Play an increasing role in manufacturing. Due to the high temperature resistance, corrosion resistance and good chemical stability of gold, gold electroplating is widely used in the electronics industry. [0003] At present, the most widely used electroplating technology in my country is alkaline cyanide gold plating, which is mainly based on KAu(CN) 2 As the main salt, KCN is used as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/48C07F1/12
Inventor 杨永刚李艺李宝宗候逢文
Owner 苏州晶拓生物医药科技有限公司
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