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Micro-arc oxidation method for magnesium aluminum alloy and electrolyte

A micro-arc oxidation, magnesium-aluminum alloy technology, applied in the direction of anodizing, can solve the problems of uneven surface of magnesium alloy micro-arc oxidation film, poor corrosion resistance and wear resistance, environmental pollution, etc., to avoid strong acid and strong alkali The effect of using, smooth surface and stable process

Active Publication Date: 2016-11-09
苏州菲尔德精密制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current micro-arc oxidation technology of magnesium alloys is not mature enough and the process steps are cumbersome, and there will be defects such as uneven surface of magnesium alloy micro-arc oxidation film, poor corrosion resistance and wear resistance, and the acid electrolyte often used at present is harmful to the environment and human body. There is greater damage, a large amount of cleaning water is required in the whole process, and pickling and alkali cleaning are required to cause environmental pollution

Method used

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  • Micro-arc oxidation method for magnesium aluminum alloy and electrolyte

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Effect test

Embodiment 1

[0025] In this embodiment, a magnesium-aluminum alloy micro-arc oxidation method, the steps of the method are as follows:

[0026] S1. Plasma polishing: immerse the magnesium alloy object to be polished in the heated aqueous electrolyte solution, and apply a positive polarity voltage to it, and the applied voltage is a DC voltage;

[0027] S2, the first cleaning: put the polished magnesium alloy object into the cleaning tank for cleaning;

[0028] S3. Micro-arc oxidation: The magnesium alloy object cleaned for the first time is used as the anode of the electrolytic cell, and the stainless steel container is used as the cathode of the electrolytic cell, and the pulse current is used to perform micro-arc oxidation treatment on the magnesium alloy. The current density is constant, and the micro-arc oxidation process parameters are: : Current density 25mA / cm 2 , the positive and negative pulse duty ratios are 10%, the frequency is 400HZ, the power-on time is 40s, the electrolyte ...

Embodiment 2

[0036] In this embodiment, a magnesium-aluminum alloy micro-arc oxidation method, the steps of the method are as follows:

[0037] S1. Plasma polishing: immerse the magnesium alloy object to be polished in the heated aqueous electrolyte solution, and apply a positive polarity voltage to it, and the applied voltage is a DC voltage;

[0038] S2, the first cleaning: put the polished magnesium alloy object into the cleaning tank for cleaning;

[0039] S3. Micro-arc oxidation: The magnesium alloy object cleaned for the first time is used as the anode of the electrolytic cell, and the stainless steel container is used as the cathode of the electrolytic cell, and the pulse current is used to perform micro-arc oxidation treatment on the magnesium alloy. The current density is constant, and the micro-arc oxidation process parameters are: : Current density 35mA / cm 2 , the positive and negative pulse duty ratios are 25%, the frequency is 750HZ, the power-on time is 50s, the electrolyte ...

Embodiment 3

[0047] In this embodiment, a magnesium-aluminum alloy micro-arc oxidation method, the steps of the method are as follows:

[0048] S1. Plasma polishing: immerse the magnesium alloy object to be polished in the heated aqueous electrolyte solution, and apply a positive polarity voltage to it, and the applied voltage is a DC voltage;

[0049] S2, the first cleaning: put the polished magnesium alloy object into the cleaning tank for cleaning;

[0050] S3. Micro-arc oxidation: The magnesium alloy object cleaned for the first time is used as the anode of the electrolytic cell, and the stainless steel container is used as the cathode of the electrolytic cell, and the pulse current is used to perform micro-arc oxidation treatment on the magnesium alloy. The current density is constant, and the micro-arc oxidation process parameters are: : Current density 45mA / cm 2 , the positive and negative pulse duty cycle is 40%, the frequency is 1100HZ, the power-on time is 60s, the electrolyte t...

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Abstract

The invention discloses a micro-arc oxidation method for a magnesium aluminum alloy. The micro-arc oxidation method comprises the steps of S1, plasma polishing; S2, primary cleaning; S3, micro-arc oxidation; S4, secondary cleaning; S5, blow-drying; S6, hole sealing; S7, drying, and S8, coating. According to the magnesium aluminum alloy prepared in the method, the surface is smooth, clearances and cracks are less, burrs of which the thickness is 0.4 mm or below can be removed, thin cracks of a magnesium alloy object can be removed, computer numerical control (CNC) knife lines can be removed, and the magnesium alloy object does not need fine polishing and can be repaired after slight shrinkage; the micro-arc oxidation reaction time can be shortened from original 5 to 10 min to 40 to 60 s, 8 to 9 manufacture procedures are reduced, and 2 to 3 times of spraying can be reduced in later manufacture procedures; and the qualification rate is up to 95% or above, and the magnesium aluminum alloy can pass alcohol tests, rubber tests, adhesion cross-cut tests and surface abrasion resistance (RCA) tests.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface treatment, in particular to a magnesium-aluminum alloy micro-arc oxidation method. Background technique [0002] Due to the characteristics of magnesium alloy materials, especially in those manufacturing fields that are important to reduce the weight of the structure itself, magnesium alloys are competitors or substitutes for engineering plastics, aluminum alloys and steel. At present, magnesium alloys are widely used in industrial sectors such as automobiles, aerospace, electronics, military and nuclear energy to meet the improvement needs of audio-visual equipment, computers and communication equipment, as well as the "lightweight" of vehicles and hand tools and other special technologies. Require. Since the electrode potential of magnesium alloy is very low, it is extremely easy to be corroded. Although magnesium alloys can naturally form a basic carbonate film in the atmosphe...

Claims

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Application Information

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IPC IPC(8): C25D11/04
CPCC25D11/04
Inventor 刘勇
Owner 苏州菲尔德精密制造有限公司
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