镁合金常规化学转化膜中含有Cr6+,对人体和环境有很大危害,且膜层较薄,耐蚀性有限,因此,采用水热法对其进行处理.通过场发射扫描电镜、X射线衍射和电化学测试方法,分别对水热法处理后的Mg-Nd-Zn-Zr镁合金表面膜层的形貌、相组成和耐蚀性能进行了研究.结果表明,形成的表面膜层主要由球形颗粒状和层片状的Mg(OH)2相组成,膜层厚度约可达20 μm,且与基体结合牢固;经水热法处理后的镁合金在质量分数3.5%的NaCl水溶液中的开路电位比未处理的镁合金基体的正移了230 mV,腐蚀电流密度降低了约1个数量级,且在阳极区出现了明显的钝化现象.
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