Trivalent chromium electroplate liquid and preparing method thereof

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

Inactive Publication Date: 2016-01-13
WUXI QIAOYANG MACHINERY MFG
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  • Abstract
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  • Application Information

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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. According to the ratio in the above table, dissolve chromium trichloride hexahydrate in distilled water or pure water, stir until dissolved to obtain chromium trichloride hexahydrate solution; dissolve glycine in 55°C or 60°C or 70°C or Distilled water at 75°C, stirred until dissolved to obtain glycine solution;

[0028] b. Mix the hexahydrate chromium trichloride solution with the aminoacetic acid solution, add complexing agent; because the trivalent chromium aqueous solution generally exists stably in the form of hexahydrate complexes, the complex substitution reaction between it and the complexing ag...

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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, 0.2-0.35 mol/L of hexahydrate chromium trichloride, 0.25-0.35 mol/L of sodium gluconate, 2.0-4.5 mol/L of glycine, 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 ml/L of stabilizer and the balance solvent water. The stabilizer is a water solution comprising 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 electroplate liquid is stable in performance and long in service life, and the quality of a coating is good. Meanwhile, the preparing method is simple, operation is easy, and very good application prospects and high using 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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