Abstract
Diffusion coatings can provide an excellent corrosion protection in aggressive high temperature environments due to the enrichment of thermodynamically stable oxide formers at the alloy surface. Besides conventional monoelement diffusion coatings (e.g. al diffusion), multielement coatings can be produced in a single process step. The production of al diffusion and Al–Si, Al–Ti and Al–Si–Ti codiffusion coatings on ferritic and austenitic steels and Ni base alloys, and their performance under high temperature chloridising, sulfidising and metal dusting environments are described.
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