Influences of oxygen on corrosion characteristics of TiO2/316L stainless steel in supercritical water |
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| Affiliation: | 1. Xi''an University of Technology, Xi''an, Shaanxi, 710048, China;2. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;1. The Biosensor and Bioelectronics Technology Centre, King Mongkut''s University of Technology North Bangkok, 10800, Thailand;2. Department of Mechatronics Engineering, Faculty of Engineering, Rajamangala University of Technology Isan, Khonkaen Campus, 40000, Thailand;3. Department of Agro-Industrial, Food and Environmental Technology, Faculty of Applied Science, King Mongkut''s University of Technology North Bangkok, 10800, Thailand;1. ERE & BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, China;2. Energy Innovation Software Co. Ltd., Beijing, 100094, China;3. SINOPEC Petroleum E&P Research Institute, Beijing, 100083, China;4. China University of Geosciences, Beijing, 100083, China;1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, PR China;2. ERE & BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, China;3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;4. Department of Oil-Gas Field Development Engineering, College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;1. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, PR China;2. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, PR China;1. Electrochemical Systems Laboratory, SRM Research Institute, SRM Institute of Science and Technology, Kattankulathur, 603203, India;2. Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, India;3. Department of Chemistry, SRM University, Kattankulathur, 603203, India |
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| Abstract: | Supercritical water gasification (SCWG) is a promising technology for converting organic wastes to hydrogen. Less amount of oxygen is beneficial for increasing hydrogen generation rate. However, the corrosion rate of reactor material would be accelerated. TiO2 coating with a thickness of 0.1 mm was prepared on the surface of 316L stainless steel (SS316L) to improve its corrosion resistance in supercritical water (SCW). The corrosion performances of TiO2/SS316L were tested in a bath SCW reactor at 400 °C, 25 MPa. The influences of oxygen concentration (0–1000 mg/L) on surface morphologies and corrosion depths were studied thoroughly. Results indicated that the surface of TiO2/SS316L exhibited cracks and pores after exposed in SCW. And the average corrosion rates accelerated at higher oxygen concentrations. The interface between the coating and medium was relatively smooth and there was no obvious change in the thickness of the coating with oxygen concentration of 0 and 500 mg/L. While for that with 1000 mg/L oxygen, the surface of TiO2/SS316L exhibited reticulate crack. The cross section showed a serrate structure, and only 0.08 mm thick of the coating was remained. In addition, the corrosion mechanism of coating was discussed. |
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| Keywords: | Supercritical water Oxygen Coating 316L stainless steel Corrosion |
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