期刊
CORROSION
卷 59, 期 1, 页码 11-21出版社
NATL ASSN CORROSION ENG
DOI: 10.5006/1.3277531
关键词
Alloy 600; Alloy 690; Auger electron spectroscopy; electronic structure; nickel; oxide films; passivation; stainless steel
Oxide films formed on Type 316L (UNS S31603) stainless steel (SS), Alloy 600 (UNS N06600), and Alloy 690 (UNS, N06900) in high-temperature aqueous environments of ph 5, 8, and 10, which represent possible situations created in the secondary circuit of pressurized water nuclear reactors, were examined by scanning electron microscopy (SEM), capacitance measurements, and Auger electron spectroscopy (AES). The chemical composition of the films was strongly pH-dependent, with a marked enrichment in chromium in the films formed at pH 5. At pH 10, the films rather consisted of mixed iron-nickel oxides. The changes in chemical composition were accompanied by important changes in the electronic structure. Capacitance measurements using the Mott-Schottky approach showed that, depending on the pH of the corrosive medium, the films could be described as single layers of p-type or n-type semiconductivity. Moreover, heterojunctions (p-n) also were developed in the case of films formed at pH 8 on Type 316L SS and Alloy 690. Electronic band structure models, which describe the semiconducting character of the different films, are proposed.
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