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arXiv · 2001.09025

Passivation mechanisms and pre-oxidation effects on model surfaces of FeCrNi austenitic stainless steel

Li Ma·Eirini-Maria Pascalidou·Frédéric Wiame·Sandrine Zanna·Vincent Maurice·Philippe Marcus
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Abstract

Passivation mechanisms were investigated on (100)-oriented Fe-18Cr-13Ni surfaces with direct transfer between surface preparation and analysis by X-ray photoelectron spectroscopy and scanning tunneling microscopy and electrochemical characterization. Starting from oxide-free surfaces, pre-oxidation at saturation under ultra-low pressure (ULP) oxygen markedly promotes the oxide film Cr(III) enrichment and hinders/delays subsequent iron oxidation in water-containing environment. Exposure to sulfuric acid at open circuit potential causes preferential dissolution of oxidized iron species. Anodic passivation forces oxide film re-growth, Cr(III) dehydroxylation and further enrichment. ULP pre-oxidation promotes Cr(III) hydroxide formation at open circuit potential, compactness of the nanogranular oxide film and corrosion protection.

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Li Ma, Eirini-Maria Pascalidou, Frédéric Wiame, Sandrine Zanna, Vincent Maurice, Philippe Marcus. 2020-01-24. Passivation mechanisms and pre-oxidation effects on model surfaces of FeCrNi austenitic stainless steel. https://doi.org/10.1016/j.corsci.2020.108483

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