Shot Peening and Corrosion Resistance of Magnesium - Lithium Alloy with Cold Spray Aluminum Protective Coating

LU Fei - fei, KANG Si - yuan, LI Chang - jiu, LI Cheng - xin

doi:10.16577/j.cnki.42-1215/tb.2021.03.015

Materials Protection >

2021 , Vol. 54 >Issue 3: 86 - 93

DOI: https://doi.org/10.16577/j.cnki.42-1215/tb.2021.03.015

Shot Peening and Corrosion Resistance of Magnesium - Lithium Alloy with Cold Spray Aluminum Protective Coating

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(State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China)

Received date: 2020-09-22

Online published: 2025-07-10

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Abstract

In order to improve the corrosion protection performance of cold sprayed pure aluminum coating on the surface of magnesium - lithium alloy, a thin pure aluminum coating was first prepared on the surface of Mg - Li alloy LA43M by cold spraying technology, and then post shot peening treatment was employed to obtain a highly corrosion - resistant pure aluminum coating. Moreover, the variation of kinetic energy of shot peening impact on matrix and the effect of shot peening density per unit area on the microstructure of the coating were investigated under different shot peening inlet pressures. Results showed that a completely dense, uniform and well - bonded pure aluminum coating could be obtained under the conditions of inlet pressure of 1 MPa and the peening density of 5×103 per square centimeter. The pure aluminum coating after shot peening had higher open circuit potential and lower corrosion current density. After 600 hours neutral salt spray corrosion test, no corrosion occurs on the surface, indicating that shot peening cold sprayed pure aluminum coating could effectively protect the substrate from corrosion.

Key words： Mg - Li alloy; cold spraying; coating; shot peening; corrosion resistance

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LU Fei - fei, KANG Si - yuan, LI Chang - jiu, LI Cheng - xin . Shot Peening and Corrosion Resistance of Magnesium - Lithium Alloy with Cold Spray Aluminum Protective Coating[J]. Materials Protection, 2021 , 54(3) : 86 -93 . DOI: 10.16577/j.cnki.42-1215/tb.2021.03.015

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