Preparation method of micro-arc oxidation film layer on surface of cast magnesium alloy

A casting magnesium alloy, micro-arc oxidation technology, applied in the direction of anodic oxidation, etc., can solve the problem that the coating and the substrate are not tightly bonded, and achieve the effect of stable film quality, meeting technical index requirements, and simple process

Inactive Publication Date: 2017-05-31
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic coatings can play a long-term protective role, but the combination of coatings and substrates is not very tight, which is also an important factor restricting its development. The development of new coating processes is a good way to improve the performance of organic coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A method for preparing a micro-arc oxidation film layer on the surface of a ZM5 cast magnesium alloy. The method adopts a bipolar positive and negative constant current micro-arc oxygen power supply, uses a cast magnesium alloy part as an anode, and takes a steel plate as a cathode. The anode and the The cathode is inserted into the electrolyte, and all the parts of the cast magnesium alloy parts that need to form an oxide film are immersed in the electrolyte, and the electrolyte contains 2 to 3% Na 2 SiO 3 And 1% KOH, the temperature of the electrolyte is controlled at 25°C, the parts of the cast magnesium alloy parts to form the oxide film need to be fully immersed in the electrolyte, and a voltage of 530V is applied to the bipolar positive and negative constant current micro-arc oxygen power supply, The ratio of the positive constant current value and the negative constant current value is controlled to be 1:1, and the power-on time is 35 minutes to obtain a micro-ar...

Embodiment 2

[0013] A method for preparing a micro-arc oxidation film layer on the surface of a ZM5 cast magnesium alloy. The method adopts a bipolar positive and negative constant current micro-arc oxygen power supply, uses a cast magnesium alloy part as an anode, and takes a steel plate as a cathode. The anode and the The cathode is inserted into the electrolyte, and all the parts of the cast magnesium alloy parts that need to form an oxide film are immersed in the electrolyte, and the electrolyte contains 2 to 3% Na 2 SiO 3 And 1% KOH, the temperature of the electrolyte is controlled at 35°C, the parts of the cast magnesium alloy parts to form the oxide film need to be fully immersed in the electrolyte, and a voltage of 530V is applied to the bipolar positive and negative constant current micro-arc oxygen power supply, The ratio of the positive constant current value and the negative constant current value is controlled to be 1:1, and the power-on time is 40 minutes to obtain a micro-ar...

Embodiment 3

[0015] A method for preparing a micro-arc oxidation film layer on the surface of a ZM5 cast magnesium alloy. The method adopts a bipolar positive and negative constant current micro-arc oxygen power supply, uses a cast magnesium alloy part as an anode, and takes a steel plate as a cathode. The anode and the The cathode is inserted into the electrolyte, and all the parts of the cast magnesium alloy parts that need to form an oxide film are immersed in the electrolyte, and the electrolyte contains 2 to 3% Na 2 SiO 3 And 1% KOH, the temperature of the electrolyte is controlled at 45°C, the parts of the cast magnesium alloy parts to form the oxide film need to be fully immersed in the electrolyte, and a voltage of 530V is applied to the bipolar positive and negative constant current micro-arc oxygen power supply, The ratio of the positive constant current value and the negative constant current value is controlled to be 1:1, and the power-on time is 45 minutes to obtain a micro-ar...

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Abstract

The invention provides a preparation method of a micro-arc oxidation film layer on a surface of a cast magnesium alloy. The method adopts a bipolar positive-negative constant-current micro-arc oxygen power supply, and uses a cast magnesium alloy part as an anode and a steel plate as a cathode; the anode and the cathode are inserted in electrolyte; the electrolyte contains 2-3 mass% of Na2SiO3 and 1 mass% of KOH; the ratio of a positive constant-current value to a negative constant-current value is 1: 1; and the micro-arc oxidation film layer with a microscopic hardness of 441-563 Hv and a thickness of 20-50 microns is obtained. The preparation method adopts the bipolar positive-negative constant-current micro-arc oxygen power supply, uses arc light discharge for reinforcing and activating the oxidation reaction at the anode in weak-alkali Na2SiO3 electrolyte, and is simple in process and convenient to operate; and the obtained film layer is stable in quality to satisfy the technical index requirements.

Description

technical field [0001] The invention relates to a micro-arc oxidation surface protection technology, in particular to a method for preparing a micro-arc oxidation film on the surface of a cast magnesium alloy. Background technique [0002] At present, the traditional chemical oxidation method is usually used in the production of cast magnesium alloy oxide film, but the performance of the film formed by chemical oxidation is far lower than that of the micro-arc oxidation film, and the pollution is relatively high. The micro-arc oxidation treatment technology has the characteristics of simple process and wide material adaptability. The obtained film layer is uniform and hard. It will be a development direction of anodic oxidation of magnesium alloys. Organic coatings can play a long-term protective role, but the combination of coatings and substrates is not very tight, which is also an important factor restricting its development. The development of new coating processes is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/30C25D11/026
Inventor 杨景伟滕志强孙士江薛庆增朱立新
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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