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The decay of potential after anodization at a passive potential has been followed for a series of nickel‐molybdenum alloys and the observations used to speculate on the effects of molybdenum alloying additives on the nature of the passivating films formed on nickel in 0.15N Na2SO4 at a pH of 2.8. It is concluded that small quantities (<5 w/o) of molybdenum causes considerable defectiveness to passive films, decreasing their stability. It is proposed that at higher alloy levels, but levels which do not produce a two‐phase alloy, a mixed oxide false(Mo4+,Mo6+)xOy is produced along with a much less stable defective normalNiO .