Magnetic iron powders were treated in solutions containing NaCl or CH3 COONa as corrosion agents at 298 K and the oxide layers produced on the iron surface were identified by means of Mössbauer spectrometry. The measurement of Mössbauer spectra at various temperatures was useful to assign the chemical species produced on the surface. The spectra consisted of the superparamagnetic doublet peaks of polymorphic forms of FeOOH at room temperature. Highly corroded nails collected from different environments, i.e. sea coast, volcanic hot spring and an inland house, were examined to characterize the atmospheric corrosion products of nails. As a result, it was found that a-FeOOH and γ-Fe2O3 were present in every case. β-FeOOH and Fe3O4 were detected in nails collected at sea coast, volcanic hot spring and an inland house, respectively. The above results show that chemical pollution in the atmosphere is reflected in the species of corrosion products of nails exposed. Long-time exposure of nails resulted in the formation of γ-Fe2O3 and a-FeOOH.
!!!All Science Journal Classification (ASJC) codes
- 化学 (全般)