Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Indentation Tensile Properties of Seawater Piping with Cavitation and Immersion Degradation

해수배관 내부 에폭시 코팅재의 캐비테이션 및 침지 열화에 따른 압입인장특성

  • M. J. Jung (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • S. H. Kim (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • J. M. Jeon (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Y. S. Kim (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University) ;
  • Y. C. Kim (Materials Research Centre for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University)
  • 정민재 (국립안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 김수현 (국립안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 전종모 (국립안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 김영식 (국립안동대학교 신소재공학부 청정에너지소재기술연구센터) ;
  • 김영천 (국립안동대학교 신소재공학부 청정에너지소재기술연구센터)
  • Received : 2023.09.16
  • Accepted : 2023.10.14
  • Published : 2023.12.29
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Abstract

Seawater has been used to cool devices in nuclear power plants. However, the pipes used to transport seawater are vulnerable to corrosion; hence, the inner side of pipelines is coated with an epoxy layer as prevention. Upon coating damage, the pipe becomes exposed, and corrosion progresses. The major cause is widely known as cavitation corrosion, causing the degradation of mechanical properties. In this study, corroded specimens were prepared using cavitation and immersion methods to clarify the degradation trend of mechanical properties with corrosion. Three different types of epoxy coatings were used, and accelerated cavitation procedures were composed of amplitudes of 15 ㎛, 50 ㎛, and 85 ㎛ for 2 h, 4 h, and 6 h. The immersion periods were 3 and 6 weeks. We conducted instrumented indentation tests on all degradation samples to measure mechanical properties. The results showed that higher cavitation amplitudes and longer cavitation or immersion times led to more degradation in the samples, which, in turn, decreased the yield strength. Of the three samples, the C coating had the highest resistance to cavitation and immersion degradation.

Keywords

Acknowledgement

이 논문은 안동대학교 기본연구지원사업에 의하여 연구되었습니다.

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