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采用激光熔覆技术在汽车用镁合金表面制备Al-Si合金涂层,对Al-Si合金涂层的组织和性能进行研究。结果表明,Al-Si合金熔覆层组织主要为树枝晶,主要物相为Mg_2Al_3、Mg_(17)Al_(12)、Mg_2Si。镁合金激光表面熔覆Al-Si合金涂层硬度分为4个不同区域,分别为熔覆层、结合区、热影响区和镁基体,其中次表层硬度最高,基体层硬度最低。镁合金表面随着激光功率的增加,熔覆层耐磨性和耐腐蚀性能提高。随着激光功率的增加,耐磨性先增加后降低,耐蚀性逐渐提高。
Al-Si alloy coating was prepared on the surface of magnesium alloy for automotive use by laser cladding technology, and the microstructure and properties of Al-Si alloy coating were studied. The results show that the microstructure of Al-Si alloy is mainly dendritic, and the main phases are Mg 2 Al 3, Mg 17 Al 12 and Mg 2 Si. The hardness of laser cladding Al-Si alloy coating on magnesium alloy is divided into four different zones, which are cladding layer, bonding zone, heat-affected zone and magnesium matrix. The hardness of subsurface layer is the highest and the hardness of matrix layer is the lowest. Magnesium alloy surface with the laser power increases, the wear resistance and corrosion resistance of the cladding layer increased. With the increase of laser power, the wear resistance first increases and then decreases, and the corrosion resistance gradually increases.