Method for electrodepositing wearable thick chromium coating in trivalency chromium coating solution

A technique for electrodeposition and chrome plating, which is applied in the field of electrodeposition for preparing wear-resistant thick chrome plating, can solve problems such as inability to prepare thick chrome wear-resistant plating, and achieve the effect of excellent wear resistance

Inactive Publication Date: 2007-11-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency that the trivalent chromium electroplating process cannot prepare a thick chromium wear-resis

Method used

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  • Method for electrodepositing wearable thick chromium coating in trivalency chromium coating solution
  • Method for electrodepositing wearable thick chromium coating in trivalency chromium coating solution

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Embodiment 1

[0019] The plating area is 0.04dm 2 The surface of the 45# steel or red copper workpiece is plated by the electrodeposition method of the present invention, and the pre-plating pretreatment of the workpiece adopts a conventional pre-plating pretreatment process. The plating solution formula for trivalent chromium electrodeposition wear-resistant thick chromium coating is: each liter of electrolyte contains chromium chloride 95-125g, urea 80-120g, ammonium bromide 40-50g, sodium chloride 20-35g, boric acid 6 ~10g, methanol 180~220ml, formic acid (or acetic acid, oxalic acid, aminoacetic acid, formate, acetate, oxalate) 0.1~1mol. During electroplating, high-purity graphite is used as the anode, and the 45# steel or copper workpiece after conventional pre-plating pretreatment is used as the cathode; the pH value of the electrolyte is controlled at 0-2, and the plating temperature is controlled at 40-45°C by using a constant temperature device. Appropriately, the cathode current ...

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Abstract

The invention discloses a method to produce the hard chrome plating with 30-50 mu m thickness in the trivalence chrome electroplate liquid. The present process has many disadvantages such as the plating thickness can not over 10 mu m and it can not be used to resist polish. The invention is to select the proper additive and control the condition in the base electrolyte containing the chromium chloride to produce the 800Hv hardness chrome plate with smooth surface, also after heating treatment, the hardness can reach above 1400Hv. The chrome plate has no crack and the thickness can reach 50 mu m. The anti-wear character is better than the traditional sexivalent chrome electrical sediment process in the invention. So the plating layer can be used the anti-wear layer of work-piece.

Description

technical field [0001] The invention relates to an electrodeposition method for preparing a wear-resistant thick chromium coating in an environment-friendly trivalent chromium plating solution. Background technique [0002] Chromium plating has become the most widely used electroplating layer 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 shortcomings that are difficult to overcome, such as poor dispersion and coverage, low current efficiency, high plating temperature, and serious pollution. At present, the World Health Organization and countries around the world are paying more and more attention to the pollution of hexavalent chromium plating process. Since 1997, Europe and North America have stipulated that the maximum emission of hexavalent chromium in the air is 0.001mg / m 3 . The European Union's recent order on the prohibition of the use of cer...

Claims

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Application Information

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IPC IPC(8): C25D3/06
Inventor 张俊彦曾志翔梁爱民王立平
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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