Magnesium alloy differential arc electrophoresis composite surface treating method

A composite surface treatment and electrophoretic treatment technology, applied in electrophoretic plating, electrolytic coating, anodizing and other directions, can solve the problems of complex process and environmental pollution, and achieve the effect of good bonding strength and cost saving.

Inactive Publication Date: 2007-02-07
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnesium alloy after anodic oxidation and chromizing treatment is analyzed by salt spray test, and its corrosion resistance is within 100 hours, which is far lower than the requirement of more than 500 hours for practical application; micro-arc oxidation technology is characterized by its simple process, high efficiency, and no pollution , strong ability to handle workpieces, etc., have been developed rapidly, and the properties of magnesium alloys have been greatly improved. However, the ceramic film formed aft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1

[0017] First, according to the weight and volume ratio, the electrolyte is prepared with sodium silicate 5g / L, potassium hydroxide 11g / L and potassium fluoride 7g / L, and the magnesium alloy workpiece to be processed is placed in the electrolyte for micro-arc oxidation. , Use magnesium alloy workpiece as anode, stainless steel plate as cathode, and control the process parameters of the treatment process as shown in Table 1, so that a magnesium alloy ceramic layer with a thickness of 5um is formed on the surface of the magnesium alloy workpiece;

[0018] Time / minute

[0019] Secondly, immerse the magnesium alloy workpiece processed in the previous step in deionized water and clean it with an ultrasonic cleaner for 10 minutes;

[0020] Finally, the cleaned magnesium alloy workpiece is subjected to cathodic electrophoresis, the magnesium alloy workpiece is used as the anode, the stainless steel plate is used as the cathode, and the electrolyte is stirred u...

Example Embodiment

[0022] Example 2

[0023] The magnesium alloy workpiece to be processed is subjected to a micro-arc oxidation treatment process as in Example 1, and the process parameters of the treatment process are controlled as shown in Table 3, so that a magnesium alloy ceramic layer with a thickness of 20um is formed on the surface of the magnesium alloy workpiece;

[0024] Time / minute

[0025] Secondly, immerse the magnesium alloy workpiece processed in the previous step in deionized water and clean it with an ultrasonic cleaner for 8 minutes;

[0026] Finally, the cleaned magnesium alloy workpiece is subjected to cathodic electrophoresis treatment, the magnesium alloy workpiece is used as the cathode, and the stainless steel plate is used as the anode. Under the condition of stirring the electrolyte, the process parameters are controlled as shown in Table 4, and an electrophoretic paint with a thickness of 35um is obtained Even if the surface of the magnesium alloy workpiece is f...

Example Embodiment

[0028] Example 3

[0029] The magnesium alloy workpiece to be processed is subjected to a micro-arc oxidation treatment process as in Example 1, and the process parameters of the treatment process are controlled as shown in Table 5, so that a magnesium alloy ceramic layer with a thickness of 10um is formed on the surface of the magnesium alloy workpiece;

[0030] Time / minute

[0031] Secondly, immerse the magnesium alloy workpiece processed in the previous step in deionized water and clean it with an ultrasonic cleaner for 10 minutes;

[0032] Finally, the cleaned magnesium alloy workpiece is subjected to cathodic electrophoresis treatment, the magnesium alloy workpiece is used as the anode, and the stainless steel plate is used as the cathode. Under the condition of stirring the electrolyte, the process parameters are controlled as shown in Table 6, and an electrophoretic paint with a thickness of 20um is obtained. Film, even if a composite film layer of ceramic layer a...

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Abstract

the invention discloses a compound surface disposing method of Mg-alloy micro-arc electrophoresis, which comprises the following steps: placing the disposed Mg-alloy working piece in the silicate electrolytic solution to proceed micro-arc oxidizing disposal; forming Mg-alloy ceramic layer; immersing in the deionized water; cleaning through ultrasonic wave cleaner; proceeding electrophoretic disposal for Mg-alloy working piece; forming compound film on the surface.

Description

technical field [0001] The invention relates to a surface treatment method for magnesium alloy materials, in particular to a method for surface treatment of magnesium alloy materials by using a composite process of micro-arc oxidation and electrophoresis. Background technique [0002] In recent years, magnesium alloy, as a lightweight material with unique properties, has been recognized and valued by many industries, but the poor corrosion resistance of magnesium alloy has become an important factor restricting its development. It must undergo certain surface treatment to improve corrosion resistance. In order to meet the actual needs of certain fields. [0003] At present, the common surface treatment methods of magnesium alloys include anodic oxidation, chromizing treatment, micro-arc oxidation, electrophoresis after phosphating, etc. The magnesium alloy after anodic oxidation and chromizing treatment is analyzed by salt spray test, and its corrosion resistance is within ...

Claims

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Application Information

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IPC IPC(8): C25D11/30C25D13/00
Inventor 蒋百灵师惠英李均明杨巍
Owner XIAN UNIV OF TECH
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