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| Oxidation Behavior of Super 304H Steel in Steam at 700~900 ℃ |
YUAN Juntao, WANG Wen, ZHU Shenglong( ), WANG Fuhui |
| State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract Oxidation of Super 304H steel after two different surface preparations was studied in steam of pure water at 700~900 ℃. The two preparations are grinding with emery paper down to 1000 grit and polishing with diamond paste down to 1 μm. Oxidation kinetics was measured continuously for 24 h by thermo gravimetric analyzer (TGA) connected with a steam generator. After oxidation, the surface and cross sectional morphology, the chemical composition and the phase constituent of all oxide scales were examined by means of scanning electron microscopy (SEM), X-ray energy dispersive analysis (EDS), and X-ray diffraction (XRD) respectively. The results showed that oxidation kinetics of Super 304H steel in steam followed an near-parabolic rate law, however, parabolic rate constants were significantly dependent on the exposure temperature and surface state. As a consequence of rising temperature or polishing the steel surface, the parabolic rate constants could remarkably be increased and the formation of iron oxide nodules as well as the internal oxidation beneath them could be facilitated for the oxidation of Super 304H steel in steam.
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Received: 14 June 2013
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