서지주요정보
(A) study on flow accelerated corrosion behavior of nuclear power plant characterized by electrochemical method = 전기화학적 방법을 이용한 원자력발전소 배관재의 유체가속부식 (FAC) 현상 연구
서명 / 저자 (A) study on flow accelerated corrosion behavior of nuclear power plant characterized by electrochemical method = 전기화학적 방법을 이용한 원자력발전소 배관재의 유체가속부식 (FAC) 현상 연구 / Jun-Hwan Kim.
저자명 Kim, Jun-Hwan ; 김준환
발행사항 [대전 : 한국과학기술원, 2003].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014331

소장위치/청구기호

학술문화관(문화관) 보존서고

DNE 03006

휴대폰 전송

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초록정보

Study was focused on elucidating flow accelerated corrosion (FAC) process, which has been defined as one of the major issues in nuclear power plant, in a mechanistic point of view by rotating cylinder electrode from which it was revealed as an effective device to assess velocity sensitive testing. These include proposing electrochemical methodologies in analyzing FAC, analyzing synergistic effect on corrosion behavior of base and weld metal with turbulent flow, and evaluating FAC behavior simulating high temperature, high pressure system to give light on FAC prediction model. Activation and mass transfer process regarding the FAC of low alloy steel were studied in deaerated weak alkaline solution. Electrochemical corrosion potential (ECP) and electrochemical corrosion current density was measured with a temperature range from 25℃ to 270℃ and various rotating velocity through polarization test. At room temperature, alkaline corrosion appeared above pH 10.4, where passive film was formed from pH 9.8 by the step oxidation and subsequent precipitation of ferrous hydroxyl compound. At higher temperature, formation of magnetite on the steel surface occurred, caused ECP to drop at the rate of -1.51mV/℃. ECP shifted upward with rotating condition in all temperature range by the mechanisms of diffusion of oxidizing agent, which greatly depend on both temperature and dissolved oxygen. From the comparison between electrochemical corrosion current density and cathodic deposition current density on steel surface revealed that activation process firstly dominated at room temperature, soon mass transfer process control the entire corrosion kinetics with the increase of temperature. Chemical and geometric effects of weld on FAC of SA106 Gr.C low alloy steel pipe was investigated using rotating cylinder electrode in 3.5wt% sodium chloride solution and simulated feedwater of nuclear power plants. Polarization test and weight loss test were conducted at rotating speed of 2000rpm (3.14m/s) with variation of chemical and geometric parameters. The results showed that the chemical effects were relatively larger than the geometric effects, and the welded parts became local anode and preferentially corroded, which was explained by the differences between microstructural and compositional parameters. On the other hand, under active corrosion conditions, the heat affected zone was severely corroded and microstructural effects were dominant.

서지기타정보

서지기타정보
청구기호 {DNE 03006
형태사항 ix, 133 p. : 삽도 ; 26 cm
언어 영어
일반주기 저자명의 한글표기 : 김준환
지도교수의 영문표기 : In-Sup Kim
지도교수의 한글표기 : 김인섭
수록잡지명 : "Flow-accelerated corrosion behavior of SA106 Gr.C steel in alkaline solution characterized by electrochemical techniques". Canadian metallurgical quarterly
수록잡지명 : "Flow-accelerated corrosion behavior of SA106 Gr.C weldment". Werkstoffe und korrosion
학위논문 학위논문(박사) - 한국과학기술원 : 원자력및양자공학과,
서지주기 Reference : p. 120-124
주제 Flow accelerated corrosion
Rotating cylinder electrode
Nuclear piping
Weldment corrosion
High temperature electrochemistry
유체가속부식
회전 원통전극
원자력발전소 배관재
용접재 부식
고온 전기화학
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