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Abstract Electrochemical conditions for inducing rouging on surface of AISI 316L in quasi neutral aqueous solution are studied. Potentiostatic polarization at 0.6 V vs. SSC at pH ∼ 7 allowed growth of… Click to show full abstract
Abstract Electrochemical conditions for inducing rouging on surface of AISI 316L in quasi neutral aqueous solution are studied. Potentiostatic polarization at 0.6 V vs. SSC at pH ∼ 7 allowed growth of colourless passive films with a band gap slightly lower than that estimated for the oxide grown on the SS surface by air exposure due to chromium dissolution. Under stronger anodic polarization ( U E = 1.5 V vs. SSC) coloured passive films are formed, mainly constituted by iron oxide according to their band gap ( E g = 2.0 eV). Etching in citric acid at 60 °C results to be effective in removing rouging.
Journal Title: Corrosion Science
Year Published: 2017
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