The effect of Cu on the localized corrosion of Ni-Cr-Mo alloys has been investigated in hot saline solutions by comparing the behavior of alloys, Alloy 59 (UNSa N06059) and C-2000 (UNS N06200), using electrochemical and surface analytical techniques. Copper did not have any measurable effect on passive film properties or on either the breakdown and repassivation potentials or the protection temperature. Galvanostatically controlled crevice corrosion experiments clearly demonstrated that copper suppressed metastable breakdown events, precursor for stable pits. Dynamic secondary ion mass spectrometry (D-SIMS) showed copper accumulated in crevice corroded locations but could not confirm any influence of copper on crevice propagation.

Subject
Pits, Electric current, Metal surfaces, Nickel chromium molybdenum alloys, Repassivation potentials, Corrosion initiation, Copper alloys, X-ray spectroscopy, Crevices, Sodium chloride solution, Crevice corrosion, Electrodes, Corrosion potential
Keywords:
Ni-Cr-Mo alloys, Copper, Crevice Corrosion, PD-GS-PD technique, SEM, EDX, Dynamic-SIMS
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2015
Association for Materials Protection and Performance (AMPP)
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