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Apparatus and method for improving corrosion resistance of magnesium alloy by femtosecond laser shock

A femtosecond laser and corrosion-resistant technology, applied in the direction of metal material coating process, can solve the problems of restricting the application of magnesium alloys, intergranular corrosion of magnesium alloys, pitting stress, etc., to reduce electrochemical reactions and promote grain size. Refinement, small heat-affected zone effect

Active Publication Date: 2021-07-20
JIANGSU UNIV
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Problems solved by technology

However, magnesium alloys are prone to intergranular corrosion, pitting corrosion and stress corrosion cracking, which seriously restricts the application of magnesium alloys in corrosive environments.

Method used

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  • Apparatus and method for improving corrosion resistance of magnesium alloy by femtosecond laser shock
  • Apparatus and method for improving corrosion resistance of magnesium alloy by femtosecond laser shock

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Embodiment Construction

[0019] The details and working conditions of the specific device proposed by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0020] The inventive device such as figure 1 As shown, it includes femtosecond laser 1, mirror 2, convex lens 3, square window 4, first reaction vessel 5, first water inlet 6, dilute phosphoric acid solution 7, magnesium alloy sample 8, water pipe 9, first water outlet 10. The three-dimensional mobile platform 11, the first electric pump 12, the second electric pump 13, the second water inlet 14, the second water outlet 15, the fourth electric pump 16, the second reaction vessel 17, the fourth water outlet 18, the second Three water outlets 19, a concentration sensor 20, a third electric pump 21, a concentrated phosphoric acid storage tank 22, a flow controller 23, and a computer control system 24. The first reaction vessel 5 and the second reaction vessel 17 form a circulation system through the ...

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Abstract

The invention relates to a device and method for improving the corrosion resistance of magnesium alloys by femtosecond laser shock, which includes a first reaction vessel, a magnesium alloy sample is placed in the first reaction vessel, and the magnesium alloy sample is immersed in the first reaction vessel. In the dilute phosphoric acid solution in the reaction vessel, a femtosecond laser generating device is arranged above the first reaction vessel. In the invention, the magnesium alloy sample is fixed in the dilute phosphoric acid solution, and the dilute phosphoric acid reacts with the magnesium alloy sample to form a phosphate film, which covers the surface of the magnesium alloy sample. After femtosecond laser shock, the surface of the magnesium alloy sample forms a micro-texture, dilute phosphoric acid and magnesium alloy refill the surface micro-texture formed by the femtosecond laser to increase the thickness of the phosphate film and reduce the surface roughness of the magnesium alloy. Phosphate film can improve the corrosion resistance of magnesium alloy samples. The invention can greatly reduce the corrosion sensitivity of the magnesium alloy in the corrosive environment and improve its service life.

Description

technical field [0001] The invention relates to a technology for improving the corrosion resistance of magnesium alloys, in particular to a device and method for improving the corrosion resistance of magnesium alloys by femtosecond laser shock. Background technique [0002] Magnesium alloys are widely used in aviation, aerospace, transportation, chemical, rocket and other industrial sectors because of their low density, high strength, large elastic modulus, good heat dissipation, good shock absorption, and greater impact load capacity than aluminum alloys. However, magnesium alloys are prone to intergranular corrosion, pitting corrosion and stress corrosion cracking, which seriously restricts the application of magnesium alloys in corrosive environments. Therefore, improving the corrosion resistance of magnesium alloys has become an urgent problem to be solved. In order to improve the corrosion resistance of magnesium alloys, many studies have been carried out at home and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D10/00C22F3/00C23C22/08
CPCC21D10/005C22F3/00C23C22/08
Inventor 任旭东刘怀乐童照鹏孙禺州焦加飞胡文景陈嘉男顾嘉阳
Owner JIANGSU UNIV
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