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The passive films of type 316 stainless steel formed in NaCl solutions were investigated by potentiodynamic polarization, electrochemical impedance measurement and Mott-Schottky analysis. The passive films are composed of p-type and n-type layers regardless of the presence of negative resistance in the films. With increasing the time and potential for film formation, thicker and more protective films are formed, with no evidence of chloride penetration. In addition, the charge carrier densities are affected by the content of dissolved oxygen, suggesting that chemical species necessary for passivation are provided by dissolved oxygen.
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Kim et al. (2013) studied this question.
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