- P-ISSN 1225-0163
- E-ISSN 2288-8985
The corroded surface of cold rolled steel sheet in the process of rinsing after alkali-cleaning was examined by means of X-ray Photoelectron Spectroscopy(XPS). In addition, the surface-treated cold rolled steel with 0.05wt% <TEX>$Na_5P_3O_{10}$</TEX> solution for the purpose of preventing the corrosion was examined by means of XPS and the results were compared with those for the non-treated cold rolled steel. It was found that the corroded surface consists of <TEX>$Fe_2O_3$</TEX>, FeO and <TEX>$Fe(OH)_3$</TEX> and the thickness of the oxide layer is about <TEX>$1500{\AA}$</TEX>. On the other hand, in the case of surface-treated cold rolled steel, the phosphate layer of <TEX>$60{\AA}$</TEX> thickness was found to act as a protective film over the relatively thin Fe oxide layer.