Effect of hydrogen on pitting susceptibility of 2507 duplex stainless steel |
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| Affiliation: | 1. Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), University of Science and Technology Beijing, Beijing 100083, People’s Republic of China;2. Jinzhou Petrochemical Corporation, China National Petroleum Corporation, Jinzhou, Liaoning 121001, People’s Republic of China;1. Division of Surface and Corrosion Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;2. Swerea KIMAB, SE-16407 Kista, Sweden;3. Division of Synchrotron Radiation Research, Lund University, SE-221 00 Lund, Sweden;4. European Synchrotron Radiation Facility, 38000 Grenoble, France;5. SPINCNR, Area della Ricerca di Roma 2 ? Tor Vergata, 00133 Roma, Italy;6. Sandvik Materials Technology, SE-81181 Sandviken, Sweden;1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300350, China;3. Welding laboratory, Offshore Oil Engineering (Qing Dao) Company, Qing Dao 266520, China;1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, PR China;2. Key Laboratory for Corrosion and Protection (MOE), Beijing 100083, PR China;3. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR China;4. State Key Laboratory for Mechanical Structure Strength and Vibration, Xi’an Jiaotong University, Xi’an 710049, PR China |
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| Abstract: | The effect of hydrogen on pitting corrosion susceptibility of duplex stainless steel was investigated. Pits are observed on the hydrogen-charged specimen after 6 days of immersion in 6% FeCl3 solution, while no pits on the uncharged specimen even after more than 30 days of immersion, which indicates that hydrogen promotes pitting initiation and pit growth. Moreover, pitting susceptibility increases with hydrogen charging current density. The pitting tends to nucleate initially inside the austenite or at ferrite/austenite boundaries, and then appears in the ferrite, because of different behaviors of hydrogen in two phases, such as solubility and diffusivity of hydrogen. |
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