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为提高AZ80镁合金的表面性能,在低温流水冷却条件下采用预置粉末激光熔覆法在镁合金表面制备Al63Cu27Zn10(原子数分数,%)涂层。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、显微硬度仪、摩擦磨损试验机、电化学工作站对熔覆层和基体的微观组织与性能进行了表征和分析。结果表明:熔覆层组织均匀致密,与基体呈良好冶金结合,熔覆层主要由α-Mg,二元相Al17Mg12、Al Mg、Al3Mg2,三元相Mg32Al47Cu7、Al Mg2Zn、Mg Al2O4和非晶相组成。熔覆层的显微硬度为375~683 HV,是基体(92 HV)的4~7倍,熔覆层相对耐磨性为基体的3.2倍,电极电位提高了389.5 m V,腐蚀电流降低了两个数量级。经激光熔覆Al63Cu27Zn10(原子数分数,%)涂层后,AZ80镁合金基体的耐磨耐蚀性能得到较大改善。
In order to improve the surface properties of AZ80 magnesium alloy, Al63Cu27Zn10 (atomic fraction,%) coating was prepared on the surface of magnesium alloy by laser cladding at low temperature under cooling water. The microstructure and properties of the cladding and the matrix were characterized and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness tester, friction and wear tester, and electrochemical workstation. The results show that the microstructure of the coating is uniform and compact, and the microstructure of the coating is good metallurgical bonding with the matrix. The coating mainly consists of α-Mg, binary Al17Mg12, AlMg, Al3Mg2, ternary Mg32Al47Cu7, Al Mg2Zn, Mg Al2O4 and amorphous composition. The microhardness of cladding layer is 375 ~ 683 HV, which is 4 ~ 7 times that of 92 HV. The relative wear resistance of the cladding layer is 3.2 times that of the substrate, the electrode potential is increased by 389.5 mV, and the corrosion current is reduced Two orders of magnitude. After laser cladding Al63Cu27Zn10 (atomic fraction,%) coating, AZ80 magnesium alloy substrate wear resistance and corrosion resistance can be greatly improved.