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Surface treatment method for magnesium alloy

A surface treatment and magnesium alloy technology, applied in the field of magnesium alloy surface treatment, can solve problems such as unreported, and achieve the effects of improving application performance, reducing production costs, and reducing energy consumption

Inactive Publication Date: 2006-02-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the base materials of electroplating aluminum mainly include carbon, copper and steel, etc., and there is no report on the surface of magnesium alloy plating aluminum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The sample is an extruded AZ31D magnesium alloy, and the specific operation steps are as follows:

[0017] 1. Mechanical decontamination: Grinding with sandblasting or sandpaper to remove foreign matter such as burrs, firm oxides, lubricants for extrusion, mold release agents, casting sand, cutting oil, etc., to reduce surface roughness; washing with water;

[0018] 2. Alkaline washing and degreasing: wash with a mixed solution of 10g / l sodium hydroxide, 15g / l sodium phosphate, and 15g / l sodium carbonate to remove general dirt, sintered lubricant, cutting contacts, etc.; the temperature is controlled at 90 ° C, The time is 3min; wash with water;

[0019] 3. Pickling: immerse with concentrated hydrofluoric acid (11%) to remove scales, corrosion products, lubricants attached to sintering, lubricants brought in and other dirt that have not been removed during degreasing; the temperature is 20°C , the time is 1min; water washing, vacuum drying;

[0020] 4. Elect...

Embodiment 2

[0022] The sample is an extruded AZ91D magnesium alloy, and the specific operation steps are:

[0023] 1. cleaning pretreatment (comprising mechanical decontamination, alkali washing degreasing, pickling etc., basically with embodiment 1)

[0024] 2. Electroplating: Put the cleaned magnesium alloy as the cathode and the industrial pure aluminum as the anode into the electroplating solution respectively, and conduct electroplating by direct current. The composition of the electroplating solution is: AlCl 3 The mole fraction accounts for 75%, and the rest is NaCl; the plating temperature is: 200°C; the voltage is 4.0v; the current density is: 5A / cm 2 ;The time is 30s.

Embodiment 3

[0026] The sample is an extruded AZ31D magnesium alloy, and the specific operation steps are as follows:

[0027] 1. cleaning pretreatment (comprising mechanical decontamination, alkali washing degreasing, pickling etc., basically with embodiment 1)

[0028] 2. Electroplating: Put the cleaned magnesium alloy as the cathode and the industrial pure aluminum as the anode into the electroplating solution respectively, and conduct electroplating by direct current. The composition of the electroplating solution is: AlCl 3 The mole fraction accounts for 65%, and the rest is 1-ethyl-3-methylimidazole chloride (MEIC); the plating temperature is: 20°C; the voltage is 5.0v; the current density is: 3A / cm 2 ;The time is 30s.

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Abstract

The invention relates to a method for treating magnesium alloy surface, wherein cleaned magnesium alloy being taken as catelectrode and commercial-purity aluminum as anode are placed in electroplating solution, continuous current is adopted to electroplate, electroplating solution is mixture of AlCl3 and inorganic salt or organic salt, and temperature and current density are fixed according to different salts. The invention makes use of protection and decoration of aluminum to increase applicability of magnesium alloy, cut cost of surface treatment largely and increase its barrier property.

Description

technical field [0001] The invention relates to a method for surface treatment of magnesium alloys, in particular to a method for electroplating aluminum on the surface of magnesium alloys. Background technique [0002] Magnesium alloy is known as the most ideal electronic product in the 21st century because of its excellent comprehensive properties such as light weight, high rigidity, impact resistance, good electromagnetic compatibility, strong heat dissipation capacity, convenient processing, easy recycling and compliance with environmental protection requirements. The shell material can be widely used in the field of transportation. [0003] Although magnesium alloy has many excellent properties, it is easy to be corroded due to its active chemical properties. The basic carbonate film formed by its natural passivation in the air is thin and loose, and its protection is poor. Therefore, magnesium alloy must be used as a structural material. Take reliable surface protecti...

Claims

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Application Information

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IPC IPC(8): C25D3/66C25D5/30
Inventor 杨昇刘忠侠王明星宋天福翁永刚左秀荣
Owner ZHENGZHOU UNIV
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