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 (UE = 1.5 V vs. SSC) coloured passive films are formed, mainly constituted by iron oxide according to their band gap (Eg = 2.0 eV). Etching in citric acid at 60 °C results to be effective in removing rouging.

Di Franco, F., Santamaria, M., Massaro, G., Di Quarto, F. (2017). Photoelectrochemical monitoring of rouging and de-rouging on AISI 316L. CORROSION SCIENCE, 116, 74-87 [10.1016/j.corsci.2016.12.016].

Photoelectrochemical monitoring of rouging and de-rouging on AISI 316L

DI FRANCO, Francesco;SANTAMARIA, Monica
;
DI QUARTO, Francesco
2017-01-01

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 (UE = 1.5 V vs. SSC) coloured passive films are formed, mainly constituted by iron oxide according to their band gap (Eg = 2.0 eV). Etching in citric acid at 60 °C results to be effective in removing rouging.
2017
Settore ING-IND/23 - Chimica Fisica Applicata
Di Franco, F., Santamaria, M., Massaro, G., Di Quarto, F. (2017). Photoelectrochemical monitoring of rouging and de-rouging on AISI 316L. CORROSION SCIENCE, 116, 74-87 [10.1016/j.corsci.2016.12.016].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/223271
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