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Electroplating process for surface of magnesium alloy motorcycle hub

A technology of wheel hub surface and electroplating process, which is applied in metal material coating process, liquid chemical plating, coating and other directions to achieve the effects of high coating density, solving environmental pollution caused by unstable solution, and excellent corrosion resistance.

Inactive Publication Date: 2008-10-08
GCI SCI & TECH +1
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  • Abstract
  • Description
  • 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

[0027] The test material is AM60 magnesium alloy motorcycle wheel, and the process flow is: mechanical polishing→wax removal→alkaline cleaning→acid cleaning→activation→zinc dipping→nickel electroplating→burned copper electroplating→acid copper electroplating→semi-bright nickel plating→bright nickel plating →Chrome plating. (Wash with water once between each step)

[0028] (1) Polishing The surface of the magnesium alloy motorcycle hub is treated to a bright surface by mechanical polishing.

[0029] (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 ethoxylate: 1%-3%, nonylphenol ethoxylate phosphate: 1%-5%, water: 56%-63%; ultrasonic, temperature: 60- 70°C, 10min.

[0030] (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 -...

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Abstract

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

Description

technical field Background technique [0001] Magnesium alloy has excellent properties such as light weight, high specific strength, shock resistance and shock absorption, and is considered to be an excellent substitute for aluminum alloy 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 exhaust emissions. The wheel hub is one of the parts that account for the largest weight of the vehicle. Using magnesium alloy as the material for manufacturing the wheel hub can achieve the purpose of effectively reducing the weight of the vehicle. At present, wheels made of magnesium alloys have been widely used in motorcycles. However, the chemical properties of magnesium alloy are very active, and its corrosion resistance is poor. It is prone to damage such as pitting corrosion and galvanic corrosion in the service environment, which poses a serious threat to...

Claims

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Application Information

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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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