应用电化学极化曲线和交流阻抗方法,研究了一种有机胺类添加剂对于热浸镀锌板钼酸盐转化膜耐腐蚀性能的影响;用扫描电子显微镜观察了不同添加剂浓度条件下形成的转化膜的微观形貌.结果表明,在一定范围内,添加剂浓度的增加有利于转化膜的形成,使转化膜的耐蚀性增强.当添加剂浓度超过一定数值时,由于转化膜形成过程较快,使得膜附着力下降并发生开裂,导致膜的保护作用降低.
The influence of an organic amine addictive on corrosion performance of molybdate passive film formed on hot-dipping galvanized steel (HDGS)was investigated by using potentiodynamic polarization curves and EIS technique. Scanning electron microscopy was used to observe the morphology of the film. It was found that the concentration increase of the addictive in a certain range was favorable to the forma-tion of the conversion coating, and could improve corrosion performance of the film. When the addictive increased to a higher concentration, the film cracked due to the extremely quick reaction, which degradat-ed the corrosion performance of molybdate passive film.
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