Abstract
In this paper we present the results of corrosion resistance of boronized 1020 steel in naphthenic acid and during high temperature oxidation. The boride layer, consisting of FeB in the outer region and Fe 2B in the inner zone, was found to be extremely resistant to naphthenic acid containing media, both in the liquid and vapour phase. During high temperature oxidation in air at 650°C a very thin, 10 M protective oxide layer was formed on the boronized steel, indicating that the boride layer acts as a barrier to oxygen and/or Fe diffusion. Finally both the morphology and distribution of FeB/Fe 2B layers changed during high temperature oxidation.
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