Effect of nickel ion from autoclave material on oxidation behaviour of 304 stainless steel in oxygenated high temperature water |
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| Authors: | Wenjun Kuang Xinqiang Wu En-Hou Han Liqun Ruan |
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| Affiliation: | aState Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, 110016 Shenyang, PR China;bGraduate School of Science and Technology, Kumamoto University, Japan |
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| Abstract: | Characteristics of the oxide films formed on 304 stainless steel exposed to 290 °C oxygenated water in a nickel-lined autoclave were examined. The oxides evolve from dominating irregularly shaped hematite to faceted spinels with increasing immersion time. The surface layer of oxide film is first Cr-enriched and then Ni-enriched as immersion time increases. The oxides nucleate by solid-state reactions with selective dissolution of Fe and Ni, and then grow up through precipitation of cations from solution. Nickel ions dissolved from the nickel lining could promote the stability of NiFe2O4 spinel and influence the oxidation behaviour of 304 stainless steel significantly. |
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| Keywords: | A Stainless steel B Raman spectroscopy B SEM C Oxidation C Stress corrosion C Pourbaix diagram |
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