采用X射线衍射仪、扫描电镜、能谱分析仪和电化学工作站分别研究取向硅钢表面绝缘涂层的相成分、微观形貌、元素分布和耐腐蚀性能.结果表明:绝缘涂层为双层复合结构,底层为Mg2SiO4相,厚度为0.8μm;顶层为AlPO4相,厚度为1.4μm;两层结合处存在0.4～0.6μm的扩散层.与只涂单层Mg2SiO4相的试样相比,双层涂层试样具有更高的腐蚀电位和极化电阻,更低的腐蚀电流密度,因此耐腐蚀性良好.随着浸泡时间的延长,腐蚀溶液逐渐渗透至硅钢基底,发生腐蚀反应,其腐蚀过程可以分为3个阶段.
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