Thin pack and chemical vapor deposited (CVD) aluminide coatings on commercial ferritic-martensitic Fe-9Cr-2W steel are being investigated by creep and corrosion testing at 650°C. Mass gain results indicate that these coatings are protective at 650°C in humid air. Comparison with bare material shows that the coated region makes no contribution to the creep strength. The consumption of metal due to the exposure in water vapor of uncoated specimens is compensated by the growth of a load-bearing oxide scale. Pre-oxidation of the alloy in humid air also affects the alloy microstructure.

Subject
Test methods, Water, Coatings, Materials, Substrates, Corrosion testing, Vapors, Mechanical properties, Coating degradation, Mass gain, Oxide scales, Creep, Oxidation
Keywords:
diffusion coatings, creep, ferritic-martensitic steel, water vapor
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2007
Association for Materials Protection and Performance (AMPP)
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