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This paper presents a theoretical analysis of diffusion processes during the oxidation of an alloy when oxides of different alloying elements are formed concurrently. For idealized conditions it is possible to calculate the decrease in the oxidation rate which results from alloying a base metal, having a relatively high oxidation rate such as Cu or Fe, with less noble metals such as Al, Cr, or Be whose oxides form relatively slowly.
Carl Wagner (Sun,) studied this question.