Electroplating process for surface of magnesium alloy motorcycle hub

A technology of wheel hub surface and electroplating process, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., to achieve the effects of high plating solution stability, long service life and excellent corrosion resistance.

Inactive Publication Date: 2011-08-24
GCI SCI & TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims at the defects of the existing magnesium alloy motorcycle wheel hub plating metal coating method, and proposes a new electroplating process, which can obtain a metal coating layer with strong bonding force and high corrosion resistance on the surface of the magnesium alloy motorcycle hub hub, and at the same time Avoid the use of cyanide and hexavalent chromium Cr(VI) compounds that are harmful to human health and the environment

Method used

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  • Electroplating process for surface of magnesium alloy motorcycle hub

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Embodiment 1

[0026] The test material is AM60 magnesium alloy motorcycle wheel. The process flow is: mechanical polishing→waxing→alkaline washing→acid washing→activation→dip zinc→nickel plating→coking copper plating→acid copper plating→semi-bright nickel plating→bright nickel plating →Chrome plating. (Wash with water once between each step)

[0027] (1) Polishing The surface of the magnesium alloy motorcycle wheel hub is treated to a bright surface by mechanical polishing.

[0028] (2) Composition and process operation of wax removal: Coconut oil diethanolamide phosphate: 18%-25% (mass percentage), coconut oil diethanolamide: 5%-12%, fatty alcohol polyoxyethylene ether: 1%-3%, nonylphenol polyoxyethylene ether: 1%-3%, nonylphenol polyoxyethylene ether phosphate: 1%-5%, water: 56%-63%; ultrasonic, temperature: 60- 70°C, 10min.

[0029] (3) Sodium carbonate (Na 2 CO 3 ): 15g·dm -3 , Sodium phosphate (Na 3 PO 4 ·12H 2 O): 10g·dm -3 , Sodium silicate (Na 2 SiO 3 ): 15g·dm -3 , OP emulsifier: 3g·dm...

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Abstract

The invention discloses a combined electroplating process on a magnesium alloy motorcycle wheel hub by adopting a non-cyanide and chrome free pre-plating treatment solution. Electroplated nickel and pyrophosphate copper are adopted as dual-layer bottoming coating, and then Cu / Ni / Cr combined coating electroplating is performed, to obtain the Cu / Ni / Cr combined metallic coating with high corrosion resistance on the surface of the magnesium alloy motorcycle wheel hub. The metallic coating obtained on the surface of the magnesium alloy motorcycle wheel hub by adopting the process has the advantages that the binding force is strong, and the corrosion resistance is high, and the combined electroplating process has the prominent advantages that the personnel health is guaranteed, and the environmental pollution is avoided.

Description

Technical field Background technique [0001] Magnesium alloy has excellent properties such as light weight, high specific strength, impact resistance and shock absorption, and is considered to be an excellent aluminum alloy substitute in the automotive industry. Magnesium alloys are used in the automobile industry, which can reduce the weight of automobiles and is an effective way to reduce energy consumption and reduce exhaust emissions. The wheel hub is one of the parts that account for a relatively large vehicle weight. Using magnesium alloy as the material for manufacturing the wheel hub can achieve the purpose of effectively reducing the weight of the vehicle. Currently, wheels made of magnesium alloy have been widely used in motorcycles. However, the chemical properties of magnesium alloys are very active, and their corrosion resistance is poor. They are prone to damages such as pitting and galvanic corrosion in the use environment, which pose a serious threat to the safe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/14C25D7/04C25D3/12C23G1/12C23C18/18C23C8/40C25D3/06C23F17/00
Inventor 余刚肖耀坤张峰张资平
Owner GCI SCI & TECH
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