Abstract

The effect of the presence of dissolved ferrous ions (Fe2+(aq)) on oxide film growth and conversion on Type-316L stainless steel in pH 8.4 borate solutions was studied by a range of electrochemical and surface imaging and spectroscopic analysis techniques. The results provide a consistent picture of the anodic oxidation behavior of the stainless steel surface. At potentials below −0.3 VSCE, the rate of oxidation is somewhat decreased by the presence of Fe2+(aq) in solution. At potentials > −0.3 VSCE, the presence of Fe2+(aq) in solution substantially increases the formation of γ-FeOOH via oxidation of Fe2+(aq) at the oxide/water interface.

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