为提高镀锌板的耐蚀性，以硝酸、氟化铵、氧氯化锆为辅助成分，配制了单宁酸钝化液，并用其对镀锌板进行钝化处理。通过浸泡试验确定了最佳钝化工艺，通过扫描电镜（SEM）、Tafel曲线和交流阻抗谱研究了不同条件制备的钝化膜的形貌、耐蚀性。结果表明：镀锌层经1mol／L氢氧化钾溶液于65℃活化30s后再在含10g／L氧氯化锆的钝化液中钝化，所得钝化膜致密，出白锈时间可达100h；单宁酸钝化膜有效抑制了镀锌层腐蚀的阳极过程，提高了镀锌板耐蚀性；钝化前对镀锌板活化以及在钝化液中添加氧氯化锆均能提高钝化膜的致密度及耐蚀性。
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