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Trivalent chromium electroplate liquid and preparing method thereof

A technology of electroplating solution and trivalent chromium, applied in the field of electrochemistry, can solve the problems of strict electroplating operation requirements, unsustainable thickening of the coating layer, narrow range of process parameters, etc., and achieves a wide range of current density, a simple preparation method, and a stable plating solution. good effect

Inactive Publication Date: 2015-11-04
WUXI QIAOYANG MACHINERY MFG
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Problems solved by technology

[0004] At present, the main problems in trivalent chromium electroplating are: unstable plating solution, low tolerance to impurities, and easy failure; strict requirements for electroplating operations, narrow range of process parameters; continuous thickening of the coating

Method used

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  • Trivalent chromium electroplate liquid and preparing method thereof

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Embodiment 1～4 3

[0023] The proportioning of embodiment 1~4 trivalent chromium electroplating solution

[0024]

[0025] The compositions and proportioning ratios of the trivalent chromium electroplating solutions of the four embodiments are shown in the above table.

[0026] The preparation steps of the electroplating solution of above-mentioned four embodiments are as follows:

[0027] a. Dissolve chromium sulfate in distilled water or pure water according to the ratio in the above table, and stir until dissolved to obtain a chromium sulfate solution; dissolve citric acid in distilled water at 55°C or 60°C or 70°C or 75°C, and stir until Dissolving to obtain citric acid solution;

[0028] b. Chromium sulfate solution is mixed with citric acid solution, and complexing agent is added; since trivalent chromium aqueous solution generally exists stably in the form of a hexahydrate complex, its complexation substitution reaction with complexing agent is carried out slowly, so, After the compl...

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Abstract

The invention discloses trivalent chromium electroplate liquid and a preparing method thereof. The trivalent chromium electroplate liquid comprises, by concentration, 0.1-0.15 mol / L of chromium sulfate, 0.25-0.35 mol / L of sodium gluconate, 0.8-1 mol / L of citric acid, 0.1-0.15 mol / L of aluminum sulfate, 0.002-0.004 mol / L of dodecyl sodium gluconate, 0.4-0.8 mol / L of a complexing agent, 15-20 mol / L of a stabilizer and the balanced solvent water. The stabilizer is a water solution which is formed by 2-3 mol / L of methyl alcohol, 2-3 mol / L of sodium sulfite and 1-2 mol / L of ferrous sulfate. Compared with the prior art, the trivalent chromium electroplate liquid has the beneficial effects that the performance is stable, the service life is long, the coating quality is good, the preparing method is simple, the operation is easy, and the great application prospect and the good use value are achieved.

Description

technical field [0001] The invention relates to a trivalent chromium electroplating solution, and also relates to a preparation method of the trivalent chromium electroplating solution, belonging to the technical field of electrochemistry. Background technique [0002] Chrome plating has good hardness, wear resistance, corrosion resistance and decorative properties, and is one of the most widely used plating types in the electroplating industry. At present, there are mainly two types of electroplating methods, one is the traditional hexavalent chromium plating technology, and the other is the trivalent chromium plating technology. Among them, the first type of chromium plating technology is currently widely used, but the chromium plating technology is highly toxic and pollutes heavily. , Wastewater treatment is difficult, seriously polluting my country's water, soil and atmospheric environment, which has attracted great attention from all countries in the world. The circulati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/06
Inventor 沈秋
Owner WUXI QIAOYANG MACHINERY MFG
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