为了进一步提高热浸镀锌层的耐蚀性能,利用化学转化处理方法在热浸镀锌层表面制备了高锰酸盐转化膜.研究了工艺条件对转化膜耐中性盐雾腐蚀性能的影响,确定了最佳工艺为:KMnO<,4>质量浓度20 g/L,处理温度40℃,pH 2.5～3.0,处理时间60 min.采用扫描电镜、能谱、X射线光电子能谱、X射线衍射等技术对转化膜的表面形貌、化学成分及微观结构进行分析.结果表明,高锰酸盐转化膜主要由Zn和Mn的氧化物组成.电化学极化曲线及阻抗谱测量表明,热镀锌层经高锰酸盐化学转化工艺处理后,极化电阻增大,腐蚀电流密度减小,耐蚀性能明显提高.
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