The effect of temperature on the corrosion behavior of super duplex stainless steel S32750 in white liquor was evaluated using potentiodynamic polarization, potentiostatic polarization, electrochemical impedance spectroscopy and Mott-Schottky analysis. The corrosion current density and steady state current density increases, and the induction period of the pits is shortened with increasing temperature, indicating that the corrosion process is accelerated and protective ability of the passive film decreases at higher temperatures. The pit occurred around the MgO·Al2O3 composite inclusion with residual MnS, indicating the preferential partial dissolution of MnS. EIS results reveal that the protection of the passive film is predominantly attributed to the barrier film, and the passive film becomes more porous and less protective at higher temperatures. The passive film presents a bilayer structure and behaves as n-type and p-type, respectively and it becomes more defective at higher temperatures. The donor and acceptor densities increase and the space charge layer thickness decreases with temperature. Therefore, the passive films become more defective, resulting in decreased protective abilities of the passive films.
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Feng et al. (2015) studied this question.
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