Effect of alkali heat treatment on corrosion resistance of friction  stir processed AZ31 magnesium alloy

doi:10.13251/j.issn.0254-6051.2022.03.012

Abstract

Abstract: Friction stir processing (FSP) was performed on AZ31 magnesium alloy, and alkali heat treatment (AHT) was performed on the basal material (BM) and FSPed specimens. The effect of AHT on microstructure and corrosion resistance of the friction stir processed AZ31 magnesium alloy was studied. The results show that the FSP can significantly refine the grains, the average grain size is decreased from 12.8 μm of BM to 3.1 μm after FSP, the proportion of high angle grain boundaries decreased from 75.9% of BM to 45.3% after FSP, and the grain boundary substructure is increased. The AHT induces the material to form a dense MgO and Al₂O₃ mixed coating on the surface, which effectively improves the immersion corrosion resistance of the AZ31 magnesium alloy.

Key words: AZ31 magnesium alloy, friction stir processing, microstructure, alkali heat treatment, corrosion

CLC Number:

TG146

Chen Shanyong, Wang Kuaishe, Qiao Ke, Wang Wen. Effect of alkali heat treatment on corrosion resistance of friction stir processed AZ31 magnesium alloy[J]. Heat Treatment of Metals, 2022, 47(3): 61-66.

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Effect of alkali heat treatment on corrosion resistance of friction stir processed AZ31 magnesium alloy

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