Pure Ni‐Cr alloys containing up to 29% Cr and Co‐Cr alloys containing up to 23% Cr were prepared in vacuum. Corrosion rates in sulfuric and nitric acids, corrosion potentials, and critical current densities for passivity were determined at 25°C. It is concluded that specific alloying proportions of passive compositions are better evaluated in relation to electron configuration of the alloy system by critical current densities than by potential or corrosion rate measurements.
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Bond et al. (1960) studied this question.