应用自制的电位-pH平衡图和实验电位-pH图剖析了55％Al-Zn-1.6％Si合金镀层在不同pH条件下的腐蚀过程及其特征;并用化学分析方法跟踪分析了此合金镀层在pH≤5的含氯离子溶液中的腐蚀全过程,得出由开始时的富Zn相或元素Zn的选择性腐蚀,迅速过渡到Al-Zn共同溶解的腐蚀机制;电镜观察证实了此镀层在四个不同的pH区,的确具有不同的腐蚀特征,与电位-pH平衡图给出的结果一致。
Both the E-pH equilibrium diagram and the experimental E-pH diagram were used to investigate the corrosion process and characteristics of 55％ Al-Zn-1.6％Si coating.Chemical analysis was used to trace the total corrosion process of the coating in solutions containing Cl-with different pH values(pH=3～5) The corrosion mechanism was revealed to be selective dissolution of Znrich phase or elementary Zn at the very beginning, but rapidly coming to the propotional dissolution of the Al-Zn alloy.The micrography showed that the coating has diverse characters in four different pHvalue regions, feing coincideut with the conclusions derived from the E-pH equilibrium diagram.
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