Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of pre-corrosion and cathodic protection in artificial seawater on S-N fatigue behavior of X80 steel

인공해수 환경에서의 표면부식 및 전기방식이 X80 강재의 S-N 피로거동에 미치는 영향

  • Kwon, Jae Ki (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Ahn, Doo Hong (Department of Metallurgical and Materials Engineering, ReCAPT, Gyeongsang National University) ;
  • Jeong, Dae Ho (Department of Metallurgical and Materials Engineering, ReCAPT, Gyeongsang National University) ;
  • Kim, Young Ju (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Woo, Nam Sub (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Kim, Sangshik (Department of Metallurgical and Materials Engineering, ReCAPT, Gyeongsang National University)
  • 권재기 (한국지질자원연구원 광물자원연구본부) ;
  • 안두홍 (경상대학교 금속재료공학과) ;
  • 정대호 (경상대학교 금속재료공학과) ;
  • 김영주 (한국지질자원연구원 광물자원연구본부) ;
  • 우남섭 (한국지질자원연구원 광물자원연구본부) ;
  • 김상식 (경상대학교 금속재료공학과)
  • Received : 2013.12.30
  • Published : 2014.10.05
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Abstract

The effects of pre-corrosion and applied potentials in artificial seawater on the S-N fatigue behavior of X80 steel were examined. The X80 specimens were pre-corroded in a $FeCl_3$ solution for varying immersion times ranging from 0 to 96 h and subsequently S-N fatigued in air. It was found that the resistance to S-N fatigue decreased abruptly with 1 h immersion, while it became saturated with a further increase in immersion time. The trend observed in this study was relatively well explained by the stress concentration effect from the presence of corrosion damage on the surface. The in-situ S-N fatigue tests were also conducted on X80 steel in artificial seawater under applied potentials of -600, -850 and -1,050 mV (SCE). The fractographic and micrographic analyses were conducted on the fatigue specimens to identify the optimum cathodic protection conditions.

Keywords

Acknowledgement

Grant : Drill Riser System 기술 개발

Supported by : 한국연구재단

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