(A) study on the effect of magnetic field on the resistance of flow-accelerated corrosion = 자기장이 유체가속부식 저항성에 미치는 영향에 관한 연구

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In this study, it was considered that Flow-Accelerated Corrosion (FAC) was caused by reduction of magnetite. thus the effect of magnetic field on the magnetite which was ferromagnetic material was evaluated for developing the mitigation method of FAC. Test material used in the test was SA106 Gr.C steel which was covered with simulated oxide film. Polarization test and erosion test were performed using rotating cylinder electrode (RCE) system. Both of the electrochemical and mechanical aspect could be associated with the polarization test and erosion test. In the results of electrochemical test, electrochemical corrosion reaction was brisk in the magnetic field to not matter with existence of oxide film. This phenomenon was explained that the local mass transfer rate was increased by magnetohydrodynamic force generated by the coupling of the electric and magnetic field. However, current density was decreased with increase in magnetic field at low potential, at which hydrogen evolution reaction was dominant and hydrogen transfer rate was the controling step of total reaction rate. When the magnetic field existed, hydrogen escape rate through the oxide film was reduced and cluster was made by hydrogen bubble. Thus reaction rate at low potential was reduced by magnetic field. Erosion rate of oxide film was increased with increase in particle concentration and rotating velocity, and was decreased with increase in magnetic field intensity. Because the eroded particles re-precipitated on the oxide surface and interfered with erodent when the magnetic field existed.
Advisors
Kim, In-Sup김인섭
Description
한국과학기술원 : 원자력공학과,
Publisher
한국과학기술원
Issue Date
2001
Identifier
165966/325007 / 000993093
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력공학과, 2001.2, [ vii, 70 p. ]

Keywords

SA 106 Gr.C; rotating cylinder electrode; magnetic effect; flow-accelerated corrosion; alkaline solution; 알칼리성 용액; SA 106 Gr.C; 회전원통전극; 자기장 영향; 유체가속부식

URI
http://hdl.handle.net/10203/49438
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165966&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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