Effects of temperature on corrosion performances of TiO2/SS316L in supercritical water for hydrogen production |
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| Affiliation: | 1. Shaanxi Provincial Key Laboratory of Printing and Packaging Engineering, 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. Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China;2. International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China;1. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an 710049, PR China;2. School of Marine Sciences, GuangXi University, 100 Daxue East Road, Nanning 530004, PR China;3. Faculty of Priting and Packaging Engineering, Xi’an University of Technology, 5 South Jinhua Road, Xi’an 710048, PR China;1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. Korea Institute of Materials Science, Changwon 641-831, Republic of Korea;1. Xi''an University of Technology, Xi''an, Shaanxi, 710048, PR China;2. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, PR China |
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| Abstract: | Temperature is the most important factor for hydrogen generation during supercritical water gasification process. However, the increasing temperature could accelerate the corrosion of the reactor material, at the presence of oxygen, as less amount of oxygen can promote the hydrogen production. In this study, we prepared a 0.1 mm thick of TiO2 coating on the surface of 316L stainless steel (SS316L) to enhance the corrosion resistance of SS316L during hydrogen production process in supercritical water. The influences of temperature (400–500 °C) on surface morphologies and corrosion depth and rate of TiO2/SS316L were evaluated at 25 MPa with 1000 mg/L oxygen for 80h. Results showed that cracks and pores were present on the surface of TiO2/SS316L after corroded in SCW for 80h. The crack width and corrosion rate was aggravated at higher temperature. The remained thickness of the coating at 400 °C, 450 °C, 500 °C were 0.08 mm, 0.05 mm and 0.03 mm, respectively. NiO and NiFe2O4 were generated around the crack on the surface of TiO2/316L at 500 °C, the coating had a tendency to peel off the substrate. |
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| Keywords: | Corrosion Supercritical water Hydrogen Temperature |
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