Study on grain boundary structure related to corrosion and antifouling behavior of copper-nickel alloys in seawater

摘要

The present paper observed grain boundary structure of Cu:Ni alloys (70:30 and 90:10) studied the characteristic of the boundaries and the relationship with their corrosion resistance and antifouling properties of the alloys in seawater. The results showed that the grain boundary with thin platelet precipitates on it was sensitive to affect the antifouling properties as well as corrosion resistance of the alloys. The analysis of the corrosion product film was the key to discover the new experiment phenomenon. The experiment methods used here were natural seawater exposure, optical metallography (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The corrosion data obtained by long term full-immersed exposure of the alloys in seawater were also reported in present paper.