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Critical current densities for passivity were measured for single phase Cr-Ni-Fe alloys as a function of Cr content for 20%, 40%, 50% and 60% Ni compositions. Major discontinuities in slope approximate the ratio 12/88 for Cr to Fe in the 20 and 40% Ni alloy series, and 14/86 for Cr to Ni in the 50 and 60% Ni alloy series. These ratios correspond to observed critical compositions for passivity in the Cr-Fe and Cr-Ni binary systems. Additional discontinuities occur at the critical binary Cr to Fe ratio in the 50 and 60% Ni series. This behavior is interpreted in terms of separate electron interaction in the ternary system between Cr and Fe distinct from interaction between Cr and Ni. Flade or activation potentials become more active with increasing Cr content, corresponding to increased stability of passivity. In accord with greater stability, average time for breakdown of passivity increased exponentially with Cr content.

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