Method for improving corrosion resistance of surface of magnesium alloy on basis of micro-arc oxidation and laser remelting

A technology of micro-arc oxidation and laser remelting, which is used in devices for coating liquid on the surface, anodizing, surface reaction electrolytic coating, etc. Limited improvement, etc., to avoid cracking, improve corrosion resistance, and achieve the effect of fine crystals

Inactive Publication Date: 2019-08-02
SUZHOU ZIJINGANG INTELLIGENT MFG EQUIP
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Problems solved by technology

Chinese patent application number "201510259729.5" discloses a method for preparing a composite film of graphene oxide and micro-arc oxidation ceramics on the surface of a magnesium alloy, but the proportion of the pores of the film obtained by this method is small and dispersed, and the graphene oxide particles are scattered. The improvement of corrosion resistance of magnesium alloy surface is limited

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  • Method for improving corrosion resistance of surface of magnesium alloy on basis of micro-arc oxidation and laser remelting
  • Method for improving corrosion resistance of surface of magnesium alloy on basis of micro-arc oxidation and laser remelting
  • Method for improving corrosion resistance of surface of magnesium alloy on basis of micro-arc oxidation and laser remelting

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] A method for improving the surface corrosion resistance of magnesium alloys based on micro-arc oxidation and laser remelting, comprising the steps of:

[0025] Step 1: Preparation of micro-arc oxidation film: Polish the surface of the WE43 rare earth magnesium alloy substrate with a size of 60mm×40mm×20mm sequentially with 600-1200# SiC water sandpaper, wash the polished magnesium alloy substrate with water for 8 minutes, and then Put the washed magnesium alloy base material in absolute ethanol, clean it with ultrasonic waves with a frequency of 40KHz for 10 minutes, and finally wash it in deionized water for 8 minutes, then dry it with cold air and set it aside; Sodium metaphosphate, 8g / L sodium fluoride, and 12g / L potassium hydroxide were sequentially added to a stainless steel tank filled with distilled water, and stirred evenly. The stainless steel tank was ...

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Abstract

The invention discloses a method for improving corrosion resistance of the surface of magnesium alloy on the basis of micro-arc oxidation and laser remelting. Firstly, after micro-arc oxidation treatment is conducted on the surface of the magnesium alloy, a layer of ceramic film is obtained, the film layer is prefilled with a thin layer of graphene oxide particles through ultrasonic oscillating, then microcracks and holes of the ceramic film are filled with molten graphene oxide particles effectively through laser remelting technology, and thus corrosion resistance of the surface of the magnesium alloy is improved greatly. The method is environmentally friendly in process and high in repeatability, and a novel way is developed for improving the corrosion resistance of the surface of the magnesium alloy.

Description

technical field [0001] The invention relates to a method for improving the corrosion resistance of a magnesium alloy surface based on micro-arc oxidation and laser remelting, and belongs to the technical field of magnesium alloy surface treatment and protection. Background technique [0002] At present, magnesium alloy, as a lightweight material, is increasingly being used more and more widely. However, the electrode potential of magnesium is low, which makes magnesium alloys extremely susceptible to corrosion in humid, especially marine environments. The micro-arc oxidation technology is to grow a layer of ceramic film layer on the surface of the magnesium alloy in situ through the anode micro-plasma breakdown (spark discharge or micro-arc) in the electrolyte solution, which greatly improves the corrosion resistance of the magnesium alloy. Corrosion resistance of magnesium alloys. [0003] However, the surface of the film formed by micro-arc oxidation has many holes and c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30B05D7/24C22F1/06C23C24/10
CPCB05D7/24C22F1/06C23C24/10C25D11/026C25D11/30
Inventor 杨波杨武张树盛徐冠华顾敏杰
Owner SUZHOU ZIJINGANG INTELLIGENT MFG EQUIP
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