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Surface treatment method for improving fatigue property of magnesium alloy in corrosion environment

A technology of surface treatment and fatigue performance, applied in surface reaction electrolytic coating, anodizing, electrolytic coating, etc., can solve the problems of increased chemical activity, increased defects, surface corrosion, etc., to inhibit initiation and expansion, and improve corrosion resistance. performance, the effect of reducing corrosion pits

Inactive Publication Date: 2017-06-27
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for magnesium alloys with high chemical activity, after deformation strengthening, due to the increase of defects in the microstructure of the magnesium alloy and the increase of chemical activity, it will promote the occurrence of surface corrosion and increase the initiation of cracks.
Therefore, this method for commonly used metal materials is not suitable for magnesium alloys

Method used

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  • Surface treatment method for improving fatigue property of magnesium alloy in corrosion environment
  • Surface treatment method for improving fatigue property of magnesium alloy in corrosion environment
  • Surface treatment method for improving fatigue property of magnesium alloy in corrosion environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Step 1, pretreat the surface of the AZ31 magnesium alloy, degrease and polish with SiC sandpaper. The pretreated magnesium alloy is electrolytically polished in a phosphoric acid alcohol mixed solution at room temperature, with a voltage of 4-5V, a current of 0.1-0.2A, and a time of 550-650s, and then ultrasonic cleaning. The polished sample is subjected to a shot peening treatment with a strength of 0.15N, the shot is made of glass shot, the coverage rate is 100%, and the depth of the hardened layer is 100-120 μm.

[0056] Step 2, the magnesium alloy of shot blasting is put into electrolytic solution, wherein the concentration of sodium metasilicate nonahydrate is 15.41g / L, and potassium hydroxide concentration is 8.75g / L, and ammonium bifluoride concentration is 18g / L, three The concentration of ethanolamine is 5mL / L, the concentration of EDTA-disodium is 2g / L, stainless steel is used as the cathode and the magnesium alloy sample is used as the anode for micro-arc oxi...

Embodiment 2

[0062] Step 1, pretreat the surface of the AZ31 magnesium alloy, degrease and polish with SiC sandpaper. The pretreated magnesium alloy is electrolytically polished in a phosphoric acid alcohol mixed solution at room temperature, with a voltage of 4-5V, a current of 0.1-0.2A, and a time of 550-650s, and then ultrasonic cleaning. The polished sample is subjected to a shot peening treatment with a strength of 0.15N, the shot is made of glass shot, the coverage rate is 100%, and the depth of the hardened layer is 100-120 μm.

[0063] Step 2, the magnesium alloy of shot blasting is put into electrolytic solution, wherein the concentration of sodium metasilicate nonahydrate is 16g / L, potassium hydroxide concentration is 9g / L, ammonium bifluoride concentration is 20g / L, triethanolamine concentration 6mL / L, the concentration of EDTA-disodium is 3g / L, under the dual pulse power supply mode, stainless steel is used as the cathode, and the magnesium alloy sample is used as the anode for...

Embodiment 3

[0069] Step 1, pretreat the surface of the AZ31 magnesium alloy, degrease and polish with SiC sandpaper. The pretreated magnesium alloy is electrolytically polished in a phosphoric acid alcohol mixed solution at room temperature, with a voltage of 4-5V, a current of 0.1-0.2A, and a time of 550-650s, and then ultrasonic cleaning. The polished sample is subjected to a shot peening treatment with a strength of 0.15N, the shot is made of glass shot, the coverage rate is 100%, and the depth of the hardened layer is 100-120 μm.

[0070] Step 2, put the magnesium alloy of shot peening into electrolyte, wherein the concentration of sodium metasilicate nonahydrate is 15g / L, potassium hydroxide concentration is 8g / L, ammonium bifluoride concentration is 19g / L, triethanolamine concentration The concentration of EDTA-disodium is 5.5mL / L, and the concentration of EDTA-disodium is 2.5g / L. Under the dual pulse power supply mode, stainless steel is used as the cathode, and the magnesium alloy...

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Abstract

The invention discloses a surface treatment method for improving the fatigue property of magnesium alloy, particularly in a Cl-containing corrosion environment, and particularly relates to a surface treatment method for improving the fatigue property of magnesium alloy in a corrosion environment. The surface treatment method comprises the following steps: sequentially performing surface electrolytic polishing treatment, shot blasting pre-deformation enhanced treatment and micro-arc oxidation treatment on magnesium alloy to finally obtain a magnesium alloy shot blasting / micro-arc oxidation compound treatment film so as to finish surface treatment of magnesium alloy. According to the surface treatment method, shot blasting enhanced treatment is performed on magnesium alloy by adoption of glass balls, so that residual compressive stress on a magnesium matrix is increased, and crack production and expansion on the magnesium matrix are inhibited; besides, the compactness of a magnesium alloy micro-arc oxidation ceramic layer is improved through pre-deformation, and magnesium alloy corrosion crack sources are reduced; and moreover, the micro-arc oxidation growth rate is improved by pre-deformation, the oxidation time is shortened, and the production cost of electric energy is lowered.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and relates to a surface treatment method for improving the fatigue performance of magnesium alloys in corrosive environments. Background technique [0002] The density of magnesium alloy is between 1.75-1.85g / cm 3 Among them, the specific strength and specific stiffness are high, and the specific elastic modulus is equivalent to high-strength aluminum alloy and alloy steel. The absolute value of its elastic modulus is low, and when it is subjected to external force, the stress distribution is more uniform, which can avoid excessive stress concentration. When subjected to impact loads within the elastic range, the energy absorbed is about 50% higher than that of aluminum; its damping performance is good, and it is suitable for preparing anti-seismic parts. Compared with the currently most widely used light metal aluminum alloy, magnesium alloy is not only lighter...

Claims

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Application Information

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IPC IPC(8): C25D11/30C25F3/18C22F1/06
CPCC22F1/06C25D11/024C25D11/026C25D11/30C25F3/18
Inventor 白力静刘永青黄米红董博轩陈桂涛
Owner XIAN UNIV OF TECH
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