利用激光熔覆技术在AZ91镁合金表面制备Al-30％Cu(质量分数)合金涂层.采用X射线衍射仪、扫描电子显微镜、显微硬度仪、电化学工作站表征分析激光熔覆试样的组织和性能.结果表明:激光熔覆层与基体呈现出良好的冶金结合,无明显的气孔裂纹等缺陷.其中,熔覆区出现大量的牙齿状、花瓣状和细颗粒状组织,结合区为典型的树枝晶组织.XRD结果表明:熔覆层主要由二元相Mg17Al12、AlMg、CuMg2和三元相Al2CuMg、Mg32Al47Cu7组成.由于晶粒细化和新形成的金属间化合物的共同作用,合金熔覆层的显微硬度平均值(392.2HV)为AZ91镁合金基体硬度(约70HV)的5.6倍.熔覆层的腐蚀电位比基体的提高179.2 mV,腐蚀电流密度较基体的降低两个数量级,耐蚀性得到较大的改善.
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