Effect of micro-arc surface treatment on corrosion resistance and corrosion fatigue resistance of AZ31B magnesium alloy

doi:10.13251/j.issn.0254-6051.2022.08.043

Abstract

Abstract: Protective coatings with different section structures were prepared on AZ31B magnesium alloy by using micro-arc surface treatment (micro-arc oxidation MAO and micro-arc composite MCC). The electrochemical corrosion and corrosion fatigue properties were studied by electrochemical corrosion and corrosion fatigue tests. The results show that the MAO coating treated for 10 min shows better corrosion resistance. It is observed that there are micro-pores and micro-cracks on the surface of MAO coating on the AZ31B alloy. These micro-pores and micro-cracks are deemed as crack initiation points of fatigue cracks and can accelerate the initiation and propagation of cracks under stress conditions, which lead to a reduction of 55% in the corrosion fatigue life compared with that of the AZ31B alloy substrate. The corrosion fatigue limit of AZ31B alloy with MCC coating is (64.0±5.4) MPa, which is 59% higher than that of the AZ31B alloy substrate. Under low stress condition (＜80 MPa), the corrosion fatigue strength of the AZ31B alloy with MCC coating is significantly improved.

Key words: AZ31B magnesium alloy, micro-arc surface treatment, electrochemical corrosion, corrosion fatigue

CLC Number:

TG142.2

Shen Yi, Xue Yuna, Chen Han, Dai Rong, Wang Miao, Geng Yonghui, Zhang Xinyuan, Jiang Bailing. Effect of micro-arc surface treatment on corrosion resistance and corrosion fatigue resistance of AZ31B magnesium alloy[J]. Heat Treatment of Metals, 2022, 47(8): 257-265.

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