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Method for improving corrosion resistance of magnesium alloy through laser shock peening and magnetron sputtering

A laser shock strengthening, magnetron sputtering technology, applied in sputtering coating, metal material coating process, ion implantation coating and other directions, can solve the poor adhesion between the substrate and the metal glass film, the atomic diffusivity of metal glass film It can improve the corrosion resistance, improve the hardness, and reduce the hardness difference.

Inactive Publication Date: 2019-05-14
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current challenge is how to apply the high-hardness metallic glass film to the softer magnesium alloy
The huge difference in hardness between the two will cause uneven stress due to the deformation of the substrate, which will cause the metallic glass film to fall off from the substrate
In addition, the diffusivity of the metal glass film atoms in the substrate is very low, and the adhesion between the substrate and the metal glass film is poor.

Method used

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  • Method for improving corrosion resistance of magnesium alloy through laser shock peening and magnetron sputtering
  • Method for improving corrosion resistance of magnesium alloy through laser shock peening and magnetron sputtering
  • Method for improving corrosion resistance of magnesium alloy through laser shock peening and magnetron sputtering

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Embodiment 1

[0025] (1) Select three magnesium alloy samples with a size of 10mm×10mm×4mm (length×width×thickness) for the test, which are respectively recorded as samples A, B and C. The schematic diagram of the sample size is as follows figure 1 . Use metallographic sandpaper with sandpaper meshes of P400, P800, P1500, P2000, and P3000 to grind samples A, B, and C step by step, and then polish the workpiece with diamond spray polishing agent and polishing cloth;

[0026] (2) Set the relevant process parameters of laser shock strengthening: wavelength 1064nm, pulse width 12ns, single pulse energy 10J, frequency 1Hz, spot diameter 2mm, spot overlap rate between rows and columns 50%, constrained layer 2mm thick running water;

[0027] (3) The magnesium alloy samples B and C are controlled by the manipulator to move them to the focus point of the laser beam, and the magnesium alloy surface is subjected to large-area laser lap impact strengthening by the method of line-by-line processing;

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Abstract

The invention relates to the technical field of surface modification of magnesium alloy, in particular to a method for improving the corrosion resistance of magnesium alloy through laser shock peeningand magnetron sputtering. According to the method, the surface of the magnesium alloy is treated through the laser shock peening technique first; after the surface is polished, and a magnesium-based(Mg49Cu33Y18) metallic glass film is deposited on the surface of the magnesium alloy through the magnetron sputtering technique; the surface hardness of the magnesium alloy is greatly improved under the super acting force of laser shock waves, the hardness difference between the magnesium alloy and the metallic glass film is reduced, and the difference between the capacities to bear external forceof the magnesium alloy and the metallic glass film is reduced, so that the binding force between the metallic glass film and the magnesium alloy is improved, and the abrasion resistance of the magnesium alloy is improved; and in addition, because of the amorphous property of the metallic glass film, a corrosive medium can hardly penetrate through the metallic glass film to enter a base body, andthus, the corrosion resistance is improved.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface modification, in particular to a method for improving the corrosion resistance of magnesium alloys by combining laser shock strengthening with magnetron sputtering. Background technique [0002] Magnesium alloys have a very low density and are an advanced structural material in the automotive and aerospace industries. Recently, magnesium alloys have been favored for temporary bioimplantation due to their low elastic modulus and biodegradability. However, the low strength, poor wear resistance and corrosion resistance of magnesium alloys limit their applications in structural and biomedical fields. Metallic glass materials have no grain boundaries and dislocations, and have strong corrosion resistance; at the same time, such materials also have excellent mechanical properties, such as ultra-high strength, hardness and wear resistance. In recent years, studies have found that based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F3/00C23C14/35C23C14/16C23F17/00
Inventor 罗开玉王长雨鲁金忠
Owner JIANGSU UNIV
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