模拟古代灰口铸铁的三种表面状态在碱液中的电化学行为

The Electrochemical Behavior of Three Kinds of Surface State Simulation of Ancient Grey Cast Iron in Lye

采用极化曲线法,研究模拟古代灰口铸铁的裸表面、无氯有锈表面和除氯后表面三种表面在碱液中的电化学行为,结果表明,模拟古代灰口铸铁在亚硝酸钠溶液环境中,存在特定的[ NO-2]/[Cl-]比值,可以使得亚硝酸钠对钝化膜的修复作用与氯离子对钝化膜的破坏作用达到动态平衡,这个动态平衡点为估算除氯后锈层中含氯量(即除氯程度)提供可能性。

By using polarization curve methods, this paper studied the electrochemical behaviors of three surfaces in lye including the bare surface of simulated ancient grey cast iron, rust surface and sur-face after chloride removal. The result showed that simulated ancient grey cast iron under NaNO2 environments had certain [ ]/[ ] quality ratio. A dynamic balance was achieved between repairing effect to passive film by NaNO2 and damage effect to passive film by chloride ion. This dynamic point may help to estimate the chloride chlorinity in the rust layer which also called the dechlorination level.