Abstract
Knowledge of the structure and properties of oxide films of metals and alloys is important for understanding corrosion behaviour, because the protective action of most highly corrosion resistant metals and alloys essentially derives from passivity which is caused by an extremely thin oxide and/or hydroxide surface layer. Passivity of Fe-Cr alloys is one of the most important topics in corrosion science, because alloyed Cr is enriched in the passive film to act in a very important role regarding protection. Therefore, passive films on Fe-Cr alloys have been characterized by various ultrahigh vacuum (UHV) analytical techniques such as Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS). Such UHV surface characterization techniques cause specimens to be modified under quite different environmental conditions compared with those in which passive films are formed. Therefore, in situ electrochemical surface characterization techniques have been tried. The author of this work reported the photoelectrochemical response and electrochemical impedance spectroscopy of passive films on Fe-Cr alloys to reveal differences in electronic structure of passive films formed in a sulphuric acid and a borate buffer solution [1–3]. In the present chapter, the author summarizes the photoelectrochemical response of passive films on Fe-18Cr alloy comparing with the Mott-Schottky relation, which is correlated to corrosion behaviour.
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