利用等离子束对球墨铸铁进行表面熔凝和表面合金化强化处理.采用扫描电镜、X射线衍射仪、硬度计、电化学工作站和磨损试验机等设备对强化层的组织、性能进行测试.结果表明:等离子束表面强化处理后,球墨铸铁表面石墨相完全消失,形成的改性层显微组织主要是枝晶结构;改性层的硬度最高值出现在次表层,熔凝层的最高硬度为1243HV0.1,合金化层的最高硬度达1343HV0.1;熔凝层和合金化层的耐蚀性和耐磨性相对于基体来说有很大的提高,并且由于合金化层具有更多的碳化物,组织更加致密均匀,其耐蚀性和耐磨性明显好于熔凝层.
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