High-corrosion-resistance environmentally-friendly trivalent chromium electroplating solution and electroplating method thereof

A technology of trivalent chromium and high corrosion resistance. It is applied in the field of electroplating technology. It can solve the problems of poor coating adhesion, corrosion resistance that cannot be compared with hexavalent chromium, and limited application. It can increase the thickness of the coating and the appearance of the coating is uniform and bright , The effect of improving the current efficiency

Active Publication Date: 2014-08-20
GUANGZHOU HKS SURFACE TREATMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, trivalent chromium plating is mostly used for decorative chrome plating, and its application in functional coatings is still extremely limited. The main reason is that the coating adhesion in the high current density area of ​​trivalent chromium plating is relatively poor, and its corrosion resistance cannot be compared with that of Comparable to hexavalent chromium, not to mention solving the problem of rapid corrosion of mechanical workpieces by deicing agents

Method used

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  • High-corrosion-resistance environmentally-friendly trivalent chromium electroplating solution and electroplating method thereof
  • High-corrosion-resistance environmentally-friendly trivalent chromium electroplating solution and electroplating method thereof
  • High-corrosion-resistance environmentally-friendly trivalent chromium electroplating solution and electroplating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Plating solution composition:

[0047]

[0048]

[0049] Electroplating method: After washing the nickel-plated sheet (nickel layer thickness 9 microns), conduct electroplating test in a 267ml Hull cell, the conditions are: temperature 45°C, cathode current density 50ASD, electroplating for 30 minutes, and the anode is coated with DSA iridium titanium. layer anode. After electroplating, rinse with water and blow dry.

[0050] Evaluation of electroplating effect: observe the fine and uniform crystallization of the chromium plating layer, measure the surface hardness of 1000HV, and the thickness of 30 microns, after CaCl 2 / NaCl (1:1) salt spray test for 48 hours, the thickness difference between the high area and the low area of ​​the coating is 5 microns, and the corrosion rate is 4%.

Embodiment 2

[0052] Plating solution composition:

[0053]

[0054] Electroplating method: After washing the nickel-plated sheet (nickel layer thickness 9 microns), conduct electroplating test in a 267ml Hull cell, the conditions are: temperature 45°C, cathode current density 50ASD, electroplating for 30 minutes, and the anode is coated with DSA iridium titanium. layer anode. Rinse with water after plating, then blow dry.

[0055] Evaluation of electroplating effect: observe the fine and uniform crystallization of the chromium plating layer, measure the surface hardness of 980HV, and the thickness of 30 microns, after CaCl 2 / NaCl (1:1) salt spray test for 48 hours, the thickness difference between the high area and the low area of ​​the coating is 5 microns, and the corrosion rate is 5%.

Embodiment 3

[0057] Plating solution composition:

[0058]

[0059]

[0060] Electroplating method: After washing the nickel-plated sheet (nickel layer thickness 9 microns), conduct electroplating test in a 267ml Hull cell, the conditions are: temperature 45°C, cathode current density 50ASD, electroplating for 30 minutes, and the anode is coated with DSA iridium titanium. layer anode. After electroplating, rinse with water and blow dry.

[0061] Evaluation of electroplating effect: observe the fine and uniform crystallization of the chromium plating layer, measure the surface hardness of 990HV, and the thickness of 30 microns, after CaCl 2 / NaCl (1:1) salt spray test for 48 hours, the thickness difference between the high area and the low area of ​​the coating is 5 microns, and the corrosion rate is 4%.

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Abstract

The invention provides a high-corrosion-resistance environmentally-friendly trivalent chromium electroplating solution and an electroplating method thereof, belonging to the technical field of electroplating. The electroplating solution is composed of a main salt, a complexing agent, a stabilizing agent, a wetting agent, an additive, an electric conduction salt and water. The electroplating solution is environmentally-friendly and pollution-free in an electroplating process; the obtained plating layer has high corrosion resistance; and the chromium plating layer has good binding force with a base material, and can well resist the corrosion of a snow thawing agent to mechanical workpieces. By the electroplating method provided by the invention, the deposition speed in the electroplating process can be greatly increased. The electroplating solution and electroplating method can be widely applied in electroplating of surfaces of metal materials.

Description

field of invention [0001] The invention relates to an electroplating technology, in particular to a high-corrosion-resistant trivalent chromium electroplating technology. Background technique [0002] In relatively cold low regions such as northern Europe and northern my country, in order to reduce the incidence of snow accidents in winter and relieve urban traffic pressure, deicing agents are often used for snow removal. Chlorine salt deicing agents are widely used because of their cheap price and obvious effect. However, the chlorides contained in it, such as sodium chloride and calcium chloride, are very easy to corrode mechanical workpieces such as automobile chassis and road guardrails. This requires a coating with high corrosion resistance and high wear resistance to resist the corrosion of mechanical workpieces caused by deicing agents. [0003] Corrosion-resistant chrome plating (hard chromium) is widely used on the surface of mechanical parts due to its high hardn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/06
Inventor 牛艳丽蔡志华陈蔡喜
Owner GUANGZHOU HKS SURFACE TREATMENT CO LTD
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