6533b829fe1ef96bd128ac9a

RESEARCH PRODUCT

Passive properties of lean duplex stainless steels after long-term ageing in air studied using EBSD, AES, XPS and local electrochemical impedance spectroscopy

Olivier HeintzD. MainyVincent VignalHalina Krawiec

subject

AusteniteMaterials scienceGeneral Chemical EngineeringCapacitive sensingMetallurgyGeneral ChemistryDielectric spectroscopyCorrosionX-ray photoelectron spectroscopyFerrite (iron)ElectrodeGeneral Materials ScienceComposite materialElectron backscatter diffraction

description

Abstract Passivity of duplex stainless steel was studied after long-term ageing in air using local electrochemical impedance spectroscopy, AES, XPS and EBSD. After mechanical polishing, the passive film was homogeneous and had a capacitive behaviour described by the CPE. After long-term ageing, a small thickening was detected and O2−/OH− was significantly higher in the austenite than in the ferrite. Austenite behaved as a blocking electrode whereas two capacitive loops were observed in the ferrite (low value of O2−/OH). The loop at high frequencies was related with the oxygen reduction and the loop at low frequencies was connected with the passive film.

yearjournalcountryeditionlanguage
2013-02-01Corrosion Science
https://doi.org/10.1016/j.corsci.2012.10.009