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

•Electrochemical conditions for inducing rouging on surface of AISI 316L are studied.•Passive films were characterized by Photocurrent Spectroscopy and EIS measurements.•Etching in citric acid at 60°C for rouging removal was successfully tested.•The use of Mott-Schottky model for passive films on SS...

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Bibliographic Details
Published in:Corrosion science 2017-02, Vol.116, p.74-87
Main Authors: Di Franco, F., Santamaria, M., Massaro, G., Di Quarto, F.
Format: Article
Language:English
Subjects:
A. Stainless steel
Anodic dissolution
Anodic polarization
Austenitic stainless steels
B. Cyclic voltammetry
B. EIS
Band gap
C. Anodic films
C. Passive films
C. Photoelectrochemistry
Chromium
Citric acid
Etching
Iron oxides
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Summary:•Electrochemical conditions for inducing rouging on surface of AISI 316L are studied.•Passive films were characterized by Photocurrent Spectroscopy and EIS measurements.•Etching in citric acid at 60°C for rouging removal was successfully tested.•The use of Mott-Schottky model for passive films on SS is critically discussed in this paper. 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.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2016.12.016