目的 结合磷化与溶胶凝胶工艺,在AZ91镁合金表面制备磷化/溶胶凝胶复合膜.方法 先对镁合金进行磷化处理,再多道涂覆SiO2溶胶凝胶层,通过正交试验结合电化学分析方法,优化溶胶凝胶层涂覆工艺,并分析磷化/溶胶凝胶复合膜的表面微观形貌和耐蚀性.结果 溶胶凝胶层的优化沉积工艺如下:TEOS,TEOH,H2O,HCl体积比为28∶20∶10∶0.35,凝胶温度30℃,凝胶时间5min,涂覆6次.在优化条件下所制备的复合膜结合力好且光滑,有少许微裂纹,与镁合金基体和磷化膜样品相比,其腐蚀电流密度最小,电化学阻抗最大.结论 磷化/溶胶凝胶复合膜提高了镁合金的耐蚀性.
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