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Regeneration method of trivalent-chromium electroplating solution

A technology of electroplating solution and trivalent chromium, which is applied in electrolysis process, electrolytic components, cells, etc., can solve the problems such as the change of pH value of trivalent chromium plating solution, the unusability of trivalent chromium plating solution, and the impact on production stability, etc., to achieve The effect of reducing preparation cost, prolonging service life and improving effective life

Active Publication Date: 2014-07-23
LUOYANG WEIXIN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, this method is not effective in removing Cu 2+ 、Ni 2+ , Zn 2+ At the same time, useful trivalent chromium ions are removed, and the pH value of the trivalent chromium plating solution is changed, so that the treated trivalent chromium plating solution cannot be used according to the original conditions.
At the same time, if the trivalent chromium electroplating solution contains other useful metal ions, it will also be replaced by chromium ions in the replacement process, resulting in inaccurate proportioning and affecting the stability of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A chromium-containing electroplating waste solution is basically composed of chromium sulfate, sodium sulfate, boric acid, aluminum sulfate, sodium lauryl sulfate, complexing agent and stabilizer in a certain proportion, and the rest is water. After use, the Cu of the plating solution 2+ 、Ni 2+ , Zn 2+ The ion concentrations are 11, 40, and 65 mg / L respectively, which cannot be used normally.

[0026] Add commercially available D001 type macroporous strongly acidic styrene resin to three volumes of 8% sulfuric acid solution for regeneration treatment for 2 hours, convert the sodium type resin into hydrogen type strongly acidic cation exchange resin, and then wash with pure water Remove the acid solution and let it dry.

[0027] The obtained hydrogen-form strongly acidic cation exchange resin was saturated with Cr 2 (SO 4 ) 3 Chromium replacement in the solution for 2 hours, the volume ratio of resin and saturated chromium sulfate solution is 1:3, and then rinse wi...

Embodiment 2

[0033] A chromium-containing electroplating waste solution is basically composed of chromium sulfate, sodium sulfate, boric acid, aluminum sulfate, sodium lauryl sulfate, complexing agent and stabilizer in a certain proportion, and the rest is water. After use, the Cu of the plating solution 2+ 、Ni 2+ , Zn 2+ The ion concentrations are 8, 55, and 45 mg / L respectively, which cannot be used normally.

[0034] Add D001-CC pore strongly acidic styrene-based cation exchange resin of Tianjin Bohong Building Materials Chemical Resin Co., Ltd. to 2 times the volume of 12% sulfuric acid solution for regeneration treatment for 3 hours, and convert the sodium form resin into hydrogen form Strongly acidic cation exchange resin, then wash away the acid solution with pure water, and let it dry on the surface.

[0035] The obtained hydrogen-form strongly acidic cation exchange resin was saturated with Cr 2 (SO 4 ) 3 Chromium replacement in the solution for 2 hours, the volume ratio of ...

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PUM

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Abstract

The invention discloses a regeneration method of a trivalent-chromium electroplating solution, which comprises the steps of regeneration of cation exchange resin acid solution, replacement of resin chromium, replacement of electroplating solution, regeneration of chromium exchange resin, and adjustment of electroplating solution proportion. According to the method, the chromium exchange resin is prepared and used for exchanging Cu<2+>, Ni<2+> and Zn<2+> in the waste solution, and the proportion is adjusted to obtain the acceptable electroplating solution. The method can reutilize the abandoned trivalent-chromium electroplating solution, thereby lowering the cost, prolonging the service life of the electroplating solution and reducing the environmental pollution. No other impurity ions are introduced in the process, thereby avoiding generating negative influence on the electroplating solution. After the proportion of the electroplating solution is adjusted, the service life can reach more than 80% of that of the newly prepared electroplating solution, but the cost is only about one-third of the newly prepared electroplating solution.

Description

technical field [0001] The invention relates to an electroplating technology, in particular to a regeneration method of a trivalent chromium electroplating solution. Background technique [0002] Electroplating is an electrochemical process as well as a redox process. The basic process of electroplating is to immerse the part in a solution of metal salt as the cathode, and the metal plate as the anode, and then deposit the desired coating on the part after connecting to a DC power supply. [0003] Obtaining the desired coating on the surface of the workpiece is the core process of electroplating. The quality of this process directly affects the various properties of the coating. Due to the mature process and technology, electroplating occupies the first place in metal finishing in terms of tonnage. The development of electroplating is divided into three periods. The first period is to improve gloss or corrosion resistance. The second period is to move towards victory and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D21/22C25D3/06
Inventor 尤逸民
Owner LUOYANG WEIXIN ELECTRONICS TECH