Abstract
A high chromium stainless steel, 60% Fe—40% Cr, containing small additions of Pd (0.4 and 1.0%) was heat-treated under controlled conditions, and surface-analysed by AES and ESCA. The surface segregation of Cr, Pd, N and O was monitored, and the oxidation of the sample with a Pd content of 0.4% was studied. It was found that Pd segregates to the surface more readily than Cr, and that Pd is completely oxidized before any chromium oxides are formed. Cr diffuses much more easily in PdO than in the bulk. The initial surface segregation of Pd, N and Cr seems to be diffusion controlled.
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