Abstract
Electrochemical conditions for inducing rouging on surface of AISI 316L in quasi neutral aqueous solution are studied. Potentiostatic polarization at 0.6V 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 (UE=1.5V vs. SSC) coloured passive films are formed, mainly constituted by iron oxide according to their band gap (Eg=2.0eV). Etching in citric acid at 60°C results to be effective in removing rouging.
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