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Abstract
Rust samples from mild steel panels exposed at eight different atmospheric test sites in Sweden have been studied by transmission 57Fe-Mössbauer spectroscopy and X-ray powder diffraction. All samples exhibited superparamagnetic effects in Mössbauer spectra recorded at room temperature, due to fine particles. The corrosion products were mainly identified in low temperature (∼10 K) Mössbauer spectra and with X-ray powder diffraction. In all samples, α-FeOOH and γ-FeOOH were the main constituents (>70%). Only in the marine samples were β-FeOOH and Fe 3-σO 4 found. The α-FeOOH/γ-FeOOH ratio obtained was found to increase with the SO 2 concentration at the test sites.
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