Abstract
Corrosion-related defects of pure iron, and AISI 304 and 316 stainless steels were investigated by measuring Doppler broadening energy spectra (DBES) of positron annihilation. Defect profiles of the S parameter from DBES as a function of positron incident energy up to 30 keV (i.e. ∼1 μm depth) were analyzed. When the sample is treated with various anodic potentials (0–4 V), a significant increase in the S parameter in pure iron is observed. This corrosion process shows the presence of defects and voids of a few nanometers near the surface. However, a significant decrease of the S parameter in AISI 304 and 316 stainless steels after corrosion is observed, which is interpreted as dissolution of passivity oxide film. Different defect results are observed between pure iron and stainless steels.
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