Compositionhyphen;vshyphen;depth profiles obtained with Auger electron spectroscopy of airhyphen;oxidized stainlesshyphen;steel surfaces

摘要

Auger electron spectroscopy (AES) combined with simultaneous sputter removal of material from the sample (profiling) was used to determine changes in composition within surface layers (sim;1000 Aring;) of stainless steels which were air oxidized at various temperatures. Oxidation of 304 stainless steel at temperatures up to 600deg;C results in the formation of an Fehyphen;oxide layer with Cr and Ni appearing only deeper below the surface at the oxidehyphen;bulk interface. After treatment at 700deg;C the first signs of Crhyphen;oxide formation near the surface begin to appear. At 900deg;C the Fehyphen;oxide layer is replaced by a Crhyphen;oxide film and becomes the dominant feature. Composition profiles for airhyphen;oxidized (at 900deg;C) 321 stainless steel and Inconel are also reported.