Brightening agent for cyaniding plant of silver

A technology of silver light and concentration, applied in the field of cyanide silver plating brightener, can solve the problems of easy decomposition, discoloration of the coating, inclusions, etc., and achieve the effect of improving the brightness

Inactive Publication Date: 2004-06-30
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the currently commercialized cyanide silver plating brighteners contain sulfur, which is easy to decompose during the electrodeposition process, and the generated small molecular sulfides will be mixed in the coating, which is easy to change the color of the coating.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0007] Measure 120-180 ml of dimethylamine solution with a concentration of 33%, weigh 10-20 grams of imidazole and add them to the three-necked reaction flask in turn, stir and heat in a water bath, when the temperature of the reactants in the reaction flask reaches 55-65 °C , use a dropping funnel to slowly add 80-120 ml of epichlorohydrin dropwise, the dropping time is not less than 30 minutes; after the dropwise addition, still stir at 55-65°C for 30-45 minutes; then raise the temperature to Stir at 85-95°C for 30-45 minutes; stop stirring, naturally cool to room temperature, release the reactant, add water or distilled water to dilute to 500ml, and obtain a light yellow, slightly viscous substance, which is the desired brightener.

[0008] Add the brightener provided by the present invention into the cyanide silver plating bath and perform electroplating according to the conventional method to obtain a bright silver plating layer with uniform color, not easy to change colo...

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Abstract

A brightening agent for the cyaniding plating of silver is prepared through mixing dimethylamine solution with imidazole, heating to 55-65 deg.C, slowly adding dropwise epoxy chloropropane, stirring for 30-45 min, heating to 85-95 deg.C, stirring for 30-45 min, cooling, and diluting with water or distilled water. Its advantages are uniform lustre, not decolouring, high hardness and antiwear nature, and high binding force to basic body.

Description

technical field [0001] The invention relates to a brightener for cyanide silver plating. Background technique [0002] With the improvement of people's living standards and the rapid development of the electronic information industry, people's demand for bright silver plating is also increasing. Therefore, electroplating silver has a wide range of applications in the electronics industry and decorative industries. At present, the practical application system of electroplating silver can be divided into two categories: cyanide silver plating and cyanide-free silver plating. With the continuous improvement of people's awareness of environmental protection, cyanide-free silver plating should be the future development direction. However, compared with cyanide silver plating, the cyanide-free silver plating operation process is more complicated and the cost is higher, especially the stability of the plating solution and its brightener in the cyanide-free silver plating system ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/46
Inventor 左正忠胡进李卫东刘仁志杨江成冯祥明
Owner WUHAN UNIV
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