采用化学浸泡法在黄铜表面制得镧转化膜,转化液组成与工艺条件为:硝酸镧3.5～5.5g/L,苯并三氮唑8.0～12.0 g/L,磺基水杨酸8.0 ～ 12.0 g/L,柠檬酸15.0g/L,温度60℃,pH4,时间3 min.采用原子吸收光谱和电化学法研究了黄铜/镧转化膜在模拟雨水中的腐蚀行为.在相同的浸泡时间内,黄铜/镧转化膜在模拟雨水中溶解的铜离子质量浓度低于黄铜基体.在酸性范围内,模拟雨水的pH越高,黄铜/镧转化膜越不容易被腐蚀.镧转化膜对溶解于雨水中的SO2-和Cl-较敏感,Cl-含量的增加使黄铜/镧转化膜的点蚀增强,SO42-含量的增加使膜层整体发生严重腐蚀;NO3-含量则对其腐蚀行为的影响不大.黄铜/镧转化膜在pH=3.29的模拟雨水中的腐蚀经历3个阶段.
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