Abstract
The results of an extensive study of the mechanism of formation of chromium diffusion coatings on ferrous alloys are described. The effects of the significant coating variables on the composition, thickness and microstructure of the coatings are discussed. These variables include the pack geometry, substrate composition, type of halide activator, type of “inert filler”, time, temperature and the type of the chromium source material. The diffusion of chromium and chromium plus vanadium are considered. The chromium concentration profiles are seen to deviate from those predicted from the Fe-Cr phase diagram. Mechanisms for the coating formation are described.
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