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Method for preparing chromium-carbon nano tube composite coating in trivalent chromium plating solution

A carbon nanotube composite and trivalent chromium technology is applied in the field of electrodeposition for preparing chromium-carbon nanotube composite coatings, which can solve the problems of narrow operating conditions, poor plating solution stability, and high cost, and achieve good bonding and wear resistance. Excellent performance and corrosion resistance

Inactive Publication Date: 2010-07-07
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Vapor deposition technology has the advantages of low pollution and uniform deposition, but its cost is high and it cannot be used in large-scale industrial production; electrodeposited alloy chromium plating mainly includes Zn-Sn-Co, Ni-P, Ni-W and other ternary alloy
This method has little pollution, but the stability of the plating solution is poor and the operating conditions are narrow
In contrast, the toxicity of the trivalent chromium electrodeposition solution is only 1% of that of the hexavalent chromium solution, and it consumes less energy and has high efficiency, but its fatal disadvantage is that it cannot be plated thick and has low hardness, so it can only be used for decorative purposes. coatings and cannot be used as wear-resistant coatings and repair coatings

Method used

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Embodiment 1

[0017] The electrodeposition method of the present invention is used for plating on the surface of a metal such as steel or copper workpiece, and the pre-plating pretreatment of the workpiece adopts a conventional pre-plating pretreatment process. The formulation of trivalent chromium electrodeposition chromium-carbon nanotube composite coating solution is: every liter of electrolyte contains 100-210g of chromium chloride hexahydrate, 40-50g of ammonium bromide, 20-35g of sodium chloride, and 20-20g of boric acid. 30g, formic acid (or acetic acid, oxalic acid, glycine, formate, acetate, oxalate) 0.3-1.0mol, carbon nanotubes 0.1-10g / l. During electroplating, high-purity graphite is used as anode or titanium plate, and steel or copper workpieces that have undergone conventional pre-plating pretreatment are used as cathodes; the pH value of the electrolyte is controlled at 2-3, and the plating temperature is controlled at 20-40°C by using a constant temperature device. The mechan...

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Abstract

The invention discloses an electrodeposition method for preparing a chromium-carbon nano tube composite coating in trivalent chromium plating solution. The invention adds a carbon nano tube in a basis electrolyte comprising chromic chloride to prepare the chromium-carbon nano tube composite coating with smooth surface and firm combination with the substrate by controlling the proper process conditions. The invention has the advantages that the prepared chromium-carbon nano tube composite coating has a thickness of more than 5mum, and has higher hardness, abrasion resistance and corrosion resistance than the hexavalent chromium plating coating; and the method can replace the conventional hexavalent chromium plating process under a certain friction working condition.

Description

technical field [0001] The invention relates to an electrodeposition method for preparing a chromium-carbon nanotube composite coating in a trivalent chromium plating solution. Background technique [0002] Hard chromium coating has become one of the most widely used electroplating coatings in the industry due to its high hardness, good wear resistance and corrosion resistance. But for a long time, the traditional hexavalent chromium plating solution has many insurmountable shortcomings, such as low current efficiency, high plating temperature, serious pollution and so on. In the process of electroplating hard chromium, a large amount of hexavalent chromium in waste water and waste gas will cause great pollution to the environment. Hexavalent chromium can cause human kidney failure, heart failure, leukemia, and can strongly cause cancer. At present, the World Health Organization and countries around the world are paying more and more attention to the pollution of hexavalent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00C25D3/06
Inventor 张俊彦曾志翔梁爱民
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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