Abstract
A selective oxidation process has been developed to protect a 20%Cr/25%Ni/Nb stainless steel during exposure to carbon dioxide based environments at ≲700°C. The composition and microstructure of transverse sections of the 0.6 μm thick selective oxide scale produced has been examined by analytical electron microscopy. This has highlighted the role of easy diffusion paths in the steel in enabling chromium movement to form the outer Cr2O3 layer and the mechanism by which the inner amorphous silica layer grows. The implications of the physical and chemical characteristics of the selective oxide scale upon the degree of protection it affords are discussed.
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