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Investigation of corrosion of a rotating iron electrode in HNO3 by in-situ Raman spectroscopy |
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| Affiliation: | 1. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk 630090, Russia;2. Novosibirsk State University, Novosibirsk 630090, Russia;3. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems/GEMOC, Department of Earth and Planetary Sciences, Macquarie University, Sydney, 2109, Australia;4. Institute for Study of the Earth''s Interior, Okayama University, Misasa, Japan |
| Abstract: | Iron products resulting during reduction/oxidation processes in 0.15 M HNO3 and 0.02 M HNO3 with and without excess of supporting electrolyte are detected by Raman spectroscopy. The presence of ferrous species close to Fe depend on local pH changes and hydrodynamic conditions. Pre-corroded electrodes may be covered by Fe3O4 during cathodic treatment. The resulting oxides and hydroxides are not easily removable on stationary electrodes either at passivation potentials or during a slow reduction at −0.9 V vs. SCE. Simultaneous reduction of NO−3 to HNO2 also influences the corrosion process. |
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