在含有Ti/Zr的处理液中加入单宁酸、有机缓蚀剂和硫酸锰,在铝合金基体上得到了耐蚀性能优异的金黄色转化膜.研究了处理液各组分对转化膜外观以及耐蚀性能的影响,确定了成膜的最佳工艺为:H2TiF6 7 g/L,H2ZrF6 1 g/L,F-3 g/L,单宁酸7g/L,硫酸锰5g/L,有机酸缓蚀剂2g/L,pH 4.9,成膜时间10 min.研究表明,单宁酸和H2TiF6是转化膜着色的关键,二者缺一不可.由最佳工艺得到的转化膜的自腐蚀电流密度是铝合金基体的1.3％,耐蚀性能明显提高.
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