The electrochemical corrosion characteristics of super duplex stainless steel S32750 in LT-MED environment was carried out to investigate the effect of seawater temperature and concentration on the corrosion resistance and protective properties of the passive films using different electrochemical techniques. The results the pitting corrosion potential decreases, the passivity current density increases, induction period of pitting shortens and passivation index n decreases with the increase of temperature and seawater concentration. Eb - Ep values and the area of hysteresis loop become larger with higher temperature and seawater concentration, indicating the pitting susceptibility of passive films increases. EIS reveals that impedance decreases with increasing seawater temperature and concentration, and the protective ability is provided by the inner oxide layer, while the outer film is more defective. Mott-Schottky analysis shows that passive film present bilayer structure, and behaves as n-type and p-type, respectively. The donor and acceptor densities increase with seawater temperature and concentration, revealing passive films become more defective, resulting in decreasing of protective ability of the passive films.
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Li et al. (2015) studied this question.
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