Trivalent chromium electroplate liquid stabilizer and electroplate liquid thereof

A technology of electroplating solution and stabilizer, which is applied in the field of electrochemistry, can solve the problems of unsustainable thickening of the plating layer, low impurity tolerance, unstable plating solution, etc., achieve bright appearance, abundant raw material sources, and improve the quality of the plating layer

Inactive Publication Date: 2010-03-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the main problems in trivalent chromium plating at present is that the coating cannot be continuously thickened, the plating solution is unstable, the tolerance to impurities is low, and it is easy to fail.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take 2mol methanol, 0.5mol sodium sulfite, and 1mol ferrous sulfate to prepare 1000mL stabilizer aqueous solution.

[0047] Take 0.2mol of chromium sulfate, dissolve it in distilled water, and stir until completely dissolved; dissolve 0.5mol of boric acid in water, stir until dissolved; mix the above-mentioned chromium sulfate solution with boric acid solution, and stir; add 0.5mol of ammonium bromide and Glycine, stirred for 0.5 hours, then added 0.5 mol potassium sulfate and 0.3 mol sodium hypophosphite successively. Finally, add 5ml of stabilizer aqueous solution, add water to close to 1L; then check and adjust the pH value of the solution to 2.0; after constant volume, control the temperature at 30°C, and clean, derust and activate the workpiece according to the conventional pre-plating pretreatment. at 10A / dm 2 Electroplate at current density for 3 minutes, take it out and rinse it with water. After the test piece dries, a bright and smooth trivalent chromium hard...

Embodiment 2

[0049] Take 0.5mol methanol, 0.4mol sodium sulfite, and 0.5mol ferrous sulfate to prepare 1000mL stabilizer aqueous solution.

[0050] Take 0.6mol of chromium sulfate, dissolve it in water, and stir until it dissolves; take 0.8mol of boric acid and dissolve it in distilled water, and stir until it dissolves; mix the above-mentioned chromium sulfate solution with boric acid solution, and stir; add 2.0mol aminoacetic acid, Stir at ℃ for 1 hour, then add 1.0mol potassium sulfate, 0.5mol sodium hypophosphite, 0.2mol ammonium bromide, 30ml stabilizer aqueous solution, stir while adding, until dissolved, then stir at constant temperature 60°C for 1 hour, stand still for 1 hour ; Add water to close to 1L; then check and adjust the pH value of the solution to 3.0; after constant volume, control the temperature at 40°C, and degrease, wash, acid etch and wash the workpiece in turn, at 15A / dm 2 Electroplating under current density for 8 minutes, rinse with water after taking it out, and ...

Embodiment 3

[0052] Take 1mol methanol, 2mol sodium sulfite, and 2.5mol ferrous sulfate to prepare 1000mL stabilizer aqueous solution. Add 1ml / L stabilizer every day before the working of the electroplating solution in Example 1, which can keep the electroplating process stable for a long time.

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PUM

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Abstract

The invention discloses a trivalent chromium electroplate liquid stabilizer and an electroplate liquid thereof, and is characterized in that the stabilizer is aqueous solvent formed by mixing 0.5 to 2mol / L methyl alcohol, 0.4 to 2.0 mol / L sodium sulfite and 0.5 to 2.5 mol / L ferrous sulfate; and the additive amount of the stabilizer is 1 to 30 ml per liter of the electroplate liquid. The inventionalso discloses a trivalent chromium electroplate liquid which fundamentally comprises the following components: 0.2 to 0.6 mol / L chromium sulfate, 0.5 to 1.5 mol / L potassium sulfate, 0.02 to 0.5 mol / L ammonium bromide, 0.5 to 1.2 mol / L boric acid, 0.2 to 0.5 mol / L sodium hypophosphite, 0.2 to 2.0 mol / L aminoacetic acid, 1 to 30 ml / L stabilizer and the balance of water which is used as solvent. The invention has the advantages that as the stabilizer is added into the trivalent chromium electroplate liquid, the stability and service life of the existing trivalent chromium electroplating technique are greatly improved; the plating has smooth and bright appearance, little cracks, good bonding force and lower cost; and the stabilizer can be widely applied in different trivalent chromium electroplating techniques.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a trivalent chromium electroplating solution stabilizer and an electroplating solution thereof. Background technique [0002] The European Parliament and the Council promulgated the RoHS Directive on January 23, 2003, stipulating that Europe will completely ban electronic and electrical equipment containing hexavalent chromium from circulating in the European market on July 1, 2006; Valence chromium electroplating process; China's "Electronic Information Product Pollution Control and Management Measures" stipulates that the use of hexavalent chromium should be controlled since March 2007. Trivalent chromium electroplating is one of the most promising technologies to replace hexavalent chromium electroplating. It has the characteristics of low toxicity, only one percent of hexavalent chromium, low energy consumption, good dispersion ability and covering performance. The pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/06
Inventor 李保松乌学东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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