Corrosion of UNS N06022 was studied in Acetonitrile - Water - HBr system at 65°C. Experiments were performed in 1.92M HBr concentration, while varying the acetonitrile to water ratio. The water content was varied between 17vol% to 100vol%. In pure aqueous solution, UNS N06022 exhibits an active passive transition. When the water content is decreased to 45vol%, there is evidence of an active passive transition, however, the active dissolution peak occurs at higher current density compared to the case of 100vol% water. However, in 83vol%-17vol% water UNS N06022 exhibits active dissolution and there is no evidence of an active passive transition. The results suggest that water content plays a crucial role in the passivation of the alloy in an Acetonitrile - Water - HBr environment.

Subject
Water, Corrosion currents, Corrosion rate, Passive current, Aqueous environments, Density, Polarization curves, Current densities, Pitting, Polarization, Alloys, Corrosion potential, Electrode potential
Keywords:
UNS NO6022, Acetonitrile, HBr, CuBr2, Active Passive, Uniform corrosion, Localized corrosion
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2004
Association for Materials Protection and Performance (AMPP)
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