THE DEPTH ANALYSES OF CORROSION PRODUCTS OF Cu-Ni ALLOYS EXPOSED TO SEAWATER
Cu-Ni合金海水暴露腐蚀产物AES和XPS深度剖析

The corrosion product films of two kinds of Cu-Ni alloys exposed to seawaterfor various periods of time were investigated and further analysed by AES and XPS in depth.The results show that the protective corrosion product film is thin,uniform and adherent,in ad-dition FeOOH is found at the outside of the film,which confirms the hypothesis that ironhydroxide segregates at the surface of the film.The authors propose that the FeOOH promotesnickel enrichment in the corrosion layer by preventing nickel from running off.The corrosionproduct film without protectiveness is of layered structure,loose and bad adherent.The formerforms through direct oxidation and the latter forms by precipitation and redeposition from dis-solved species.