Effects of hydrogen on current oscillations during electro-oxidation of X70 carbon steel in phosphoric acid |
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| Institution: | 1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada, T6G 2G6;2. Department of Chemistry, Shandong University, Jinan, Shandong, 250100, PR China;1. Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science and Technology, Nanjing 210044, China;3. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China;1. College of Computer Science and Electronic Engineering, School of Physics and Electronics, Hunan University, Changsha 410082, China;2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;3. School of Electronic and Communication Engineering, Changsha University, Changsha 410022, China;4. College of Physics and Electronics, Hunan Institute of Science and Technology, Yueyang 414000, China;1. Instituto de Materiales de Misiones—IMAM (Consejo Nacional de Investigaciones Científicas y Técnicas—CONICET/Universidad Nacional de Misiones—UNaM), Félix de Azara 1552, 3300 Posadas, Misiones, Argentina;2. Instituto Sabato—UNSAM/CNEA, Av. General Paz 1499, B1650KNA San Martín, Buenos Aires, Argentina;3. Facultad de Ciencias Exactas, Químicas y Naturales—FCEQyN/Universidad Nacional de Misiones—UNaM, Félix de Azara 1552, N3300LQD Posadas, Misiones, Argentina;4. Gerencia Materiales, CNEA, Av. General Paz 1499, B1650KNA San Martín, Buenos Aires, Argentina;5. GE Global Research, 1 Research Circle, CEB2551, Schenectady, NY 12309, USA;1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China;2. Songshan Lake Materials Laboratory, Dongguan 523808, China |
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| Abstract: | It is the first time that the oscillatory electrodissolution of metals is used to study hydrogen-promoted corrosion, and the primary results prove that it is an effective method for investigating the effect of hydrogen on both the formation and dissolution of a passive film. Effects of hydrogen on the electrochemical oscillations of X70 carbon steel are investigated in 5.0 M H3PO4 solution. During the oscillatory electrodissolution of X70 steel electrode, the chemical environment near the surface of the electrode is changed artificially by the oxidation of hydrogen diffused from X70 electrode to surface. With increasing hydrogen pre-charging current density, both the induction time and the ratio of active time to passive time of the current oscillations increase, and the Flade potential also shifts positively. Oxidation of hydrogen decreases the pH value at the interface between the electrode and solution, which retards the formation of a passive film and subsequently promotes its dissolution. This investigation provides further understanding of the effect of hydrogen on the formation and dissolution processes of passive films. It is the first time to observe the periodical changes in the potential at the electrode/electrolyte interface during current oscillations by using scanning reference electrode technology. The scanning reference electrode technology is also used to verify the effect of hydrogen on the current oscillations. |
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