Abstract
The polarization behaviour and pitting corrosion of Fe-Cr alloys of 7, 13, 18, 24 wt% Cr were studied. Potentiodynamic and galvanostatic measurements were performed in the absence and presence of Cl−. As the Cr content increases the active dissolution current densities decrease while the passive range and transpassive current densities increase. Polarization parameters gave for the passive transition of the alloys a Cr concentration of ∼-13%. An increase of Cl− concentration causes the progressive destruction of passivity. It interfered with O2 evolution, and then destroyed the transpassive region. Still higher Cl− concentrations initiated pitting corrosion as shown by the oscillations in potential of the galvanostatic polarization curves supported by visual observation. Results are discussed on the basis of competitive adsorption between the aggressive and inhibitor anions for the active sites on the alloys' surface.
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