Passsivity of the alloy series in solutions is evaluated by means of potentiostatic polarization curves and by measurements of critical pitting potential. Passivity is observed only in alloys of >40% Ni, the actual critical Ni content depending on Cl− concentration, sulfate concentration, and pH. Pitting of Ni‐Cu alloys is expected and corresponding critical pitting potentials are found only in environments favoring stable passivity.
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Koizumi et al. (1974) studied this question.