Auger electron spectroscopy (AES) has been used to detect and determine the depth distribution of minute quantities of boron in the surface layer of Fe-10%Cr steel oxidized at 600°C in air contaminated with vapour phase boron. Such minute quantities of boron, affording remarkable corrosion protection, are shown to be concentrated in the surface layer 10–20 nm thick and associated with a large enhancement of chromium. Mechanisms for the boron inhibition effect are discussed in the light of these new AES results. The applications in which the protection may be utilized in a service environment can now be more closely delineated.
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