6533b862fe1ef96bd12c615b

RESEARCH PRODUCT

Influence of long-term ageing in solution containing chloride ions on the passivity and the corrosion resistance of duplex stainless steels

J. PeultierOlivier HeintzVincent VignalOlivier DelrueI. PopaH. Zhang

subject

Materials scienceGeneral Chemical EngineeringMetallurgychemistry.chemical_elementGeneral ChemistryElectrochemistryMicrostructureChlorideCorrosionElectropolishingChromiumchemistryAgeingResidual stressmedicineGeneral Materials Sciencemedicine.drug

description

Abstract The influence of long-term ageing in NaCl on the passivity and the electrochemical behavior of UNS S32304 is studied. The passive film thickness, the Cr/Fe ratio and the chloride content were significantly increased after ageing. The chloride distribution depends on residual stresses, sample microstructure and surface preparation. Local electrochemical measurements revealed that pitting potentials are between 250–550 mV vs. SCE after electropolishing. The higher the chloride content, the lower the local pitting potential. It was also shown that the presence of chloride was balanced by the enrichment in chromium after ageing. Then no pitting potential could be measured.

yearjournalcountryeditionlanguage
2011-03-01Corrosion Science
https://doi.org/10.1016/j.corsci.2010.11.011