期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2016
卷号：7
期号：4
页码：1128-1134
出版社：University of Mohammed Premier Oujda
摘要：This study focuses on the passivation and semiconducting behavior of alloy C in HNO 3 solutions. The report includes potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies along with Mott-Schottky analysis in order to determine the passive behavior of the alloy and the semiconducting properties of the passive film formed during exposure to acidic solutions. Mott–Schottky plots indicated that the donor densities increase with decreasing HNO 3 concentration. Moreover, more positive values of the flat band potential indicate better stability of the passive film with decreasing HNO 3 concentration. EIS measurements showed that the reciprocal capacitance (1/C) of the passive film is directly proportional to its thickness which increases with decreasing HNO 3 concentration. Therefore, it is clear that dilute HNO 3 solutions offer better conditions for forming the passive films with higher protection behavior, due to the growth of a much thicker and more defective passive films.
关键词：Alloy C; Polarization EIS; Mott–Schottky plot; Passive film
