Abstract
The initial stages of surface oxidation of Fe–17Cr (ferritic stainless steel) were investigated at 323 K by X-ray photoelectron spectroscopy (XPS) and inelastic electron background analysis. The results indicated the formation of a mixed iron–chromium oxide layer upon O 2 exposure and the formation of a thin chromium oxyhydroxide layer upon H 2O exposure. The oxidation of Fe did not occur in the latter case. Moreover, it was found that pre-exposing the Fe–17Cr surface to H 2O significantly hinders subsequent oxidation by O 2, thus providing a way to control the formation of nanoscale oxides on stainless steel materials. It was concluded that the formation of strongly bound hydroxyl species together with adsorbate-induced segregation of Cr severely limits the reaction between O 2/H 2O and Fe from the alloy.
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