The resistance to wear and corrosion of laser-cladding Al2O3 ceramic coating on Mg alloy |
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| Authors: | Ya-li Gao Cun-shan Wang Hong-bin Liu |
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| Institution: | a Key State Laboratory for Materials Modification, Dalian University of Technology, Dalian 116023, China
b Materials Department, Dalian University of Technology, Dalian 116023, China |
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| Abstract: | The paper presents a study on the preparation of Al2O3 ceramic coating on AZ91HP Mg alloy by laser remelting plasma-sprayed coating. It was found that after laser remelting, the coating exhibited obvious layer-like characteristics due to influence of temperature distribution, thermophysical parameters and layer thickness. According to the microstructural difference, the coating can be divided into the melted zone with the α-Al2O3 column-like crystal, the sintered zone with flock-like structure, the residual plasma-sprayed zone with loosened structure. Because of the dense column-like crystal, the hardness, wear and corrosion resistance of the laser remelted coating are much higher than those of the plasma-sprayed coating and as-received Mg alloy. |
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| Keywords: | Magnesium alloy Al2O3 ceramic coating Plasma spraying Laser remelting |
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