Relationship Between the Initiation and Propagation of SCC and the Electrochemical Noise of Alloy 600 for the Steam Generator Tubing of Nuclear Power Plants

김영식; 남희수; 권용혁; S.W.Kim; H.P.Kim; 장현영

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자료유형: 학술저널

저자정보: 김영식 남희수 권용혁 S.W.Kim H.P.Kim 장현영

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제9권 제2호

발행연도: 2010.1

수록면: 57 - 66 (10page)

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Since nuclear power plants are being operated under high temperature and high pressure, on-line monitoring technique to detect corrosion could be more effective than off-line method in shut-off period. In this operating condition, electrochemical noise method may be suitable to monitor the corrosion. This paper aims the analysis on the relation between the cracking and electrochemical noise signal of Alloy 600 under U-bending. When electrochemical noise monitoring technique was used during SCC test, it was judge to be obvious that if cracks generate, its generation can be detected by electrochemical current noise. Cracking-related noise was defined as the noise showing 5~10 times greater than the average value of background noise bands. On the base of crack noise, crack initiation time was determined. From SCC test and electrochemical noise monitoring in 25 ℃, 0.1 M Na2S4O6 solution (Reverse U-Bended Alloy 600 SE+), average crack initiation time was obtained as 9,046 seconds and from its initiation time, it could be defined that net crack propagation rate is the crack length divided by ΔT(= total test period - crack initiation time). Therefore, average net crack propagation rate was obtained to be 1.18x10-9 m/s.

#alloy 600 #stress-corrosion cracking #crack initiation time #crack propagation rate #electrochemical noise

참고문헌 (25)

참고문헌 신청

C. C. Lee / 1998 / / Corros. Sci. 40 : 959 ~

D. A. Eden / 1986 / UK Patent App.861158, US Patent 5139627

D. H. Hur / 2000 / / J. Corros Sci. Soc. of Kor. 29 : 108 ~

D. S. Seo / 2005 / / 석사 / Ulsan University

E. H. Lee / 2007 / / Mater. Sci., Eng., A 449 : 330 ~

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