Microstructure and properties of laser clad Al-Si coating on AZ33M magnesium alloy

doi:10.13251/j.issn.0254-6051.2021.05.035

Abstract

Abstract: Al-Si coating was prepared on the surface of AZ33M magnesium alloy by laser cladding technology. The microstructure and properties of the clad layer were characterized through corrosion electrochemical method test combined with X-ray diffractometer (XRD), scanning electron microscope (SEM), microhardness tester, etc.. The results show that the clad layer is mainly composed of Mg matrix, Mg₁₇Al₁₂, Mg₂Si, and Mg₂Al₃ phases. The microstructure is composed of columnar dendrites and dendrites with different directions. Due to second phase strengthening and fine-grain strengthening, the prepared Al-Si coating has higher hardness compared with magnesium alloy matrix. Compared with the matrix, the self-corrosion potential of the clad layer is increased by 400 mV, the self-corrosion current is reduced by an order of magnitude, and the corrosion resistance of the clad layer is significantly better than that of the magnesium alloy matrix.

Key words: laser cladding, magnesium alloy, Al-Si eutectic alloy, corrosion resistance, hardness

CLC Number:

TG146

Wang Xin, Pan Xide, Niu Qiang, He Xiangqian. Microstructure and properties of laser clad Al-Si coating on AZ33M magnesium alloy[J]. Heat Treatment of Metals, 2021, 46(5): 202-206.

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