Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Detection of Acoustic Signal Emitted during Corrosion of 304 Stainless Steel

304 스테인레스 강의 부식 손상 중 발생하는 음향방출신호 분석

  • Wu, Kaige (Department of Materials Science & Engineering, Seoul National University of Science & Technology) ;
  • Choe, Chan-Yang (Department of Materials Science & Engineering, Seoul National University of Science & Technology) ;
  • Byeon, Jai-Won (Department of Materials Science & Engineering, Seoul National University of Science & Technology)
  • 우카이거 (서울과학기술대학교 신소재공학과) ;
  • 최찬양 (서울과학기술대학교 신소재공학과) ;
  • 변재원 (서울과학기술대학교 신소재공학과)
  • Received : 2013.09.05
  • Accepted : 2013.10.21
  • Published : 2013.10.30
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Abstract

In this work, corrosion of 304 stainless steel was evaluated by using acoustic emission(AE) technique. AE measurement system was set for detecting acoustic signal during accelerated corrosion test of the specimen. AE signal started to be detected after the time of pitting corrosion initiation was evaluated by anodic polarization curve. Pitting corrosion damage was confirmed by optical microscopic observation of the surface morphology. AE cumulative counts and amplitude according to corrosion time could be divided into three stages. These trends were discussed in relation with changing pitting corrosion mechanism. Feasibilities of AE technique for evaluation of corrosion damage and mechanism were suggested.

음향방출법을 이용하여 304 스테인레스 강의 부식 손상 과정을 평가하였다. 스테인레스 강의 가속부식시험을 수행하면서 음향방출신호를 수집할 수 있는 측정 시스템을 구성하였다. 양극분극시험에서 공식부식(pitting corrosion)이 발생하는 시점 이후부터 음향방출(AE)신호가 검출되기 시작함을 확인하였다. 부식 실험 후 시편 표면을 광학현미경으로 관찰하여 다수의 공식부식이 발생하였음을 검증하였다. 부식 시간의 증가에 따른 AE 누적카운트 증가율과 AE 신호 진폭의 변화는 3단계로 구분되는 특징을 보였다. 이러한 AE 신호 발생 특징을 스테인레스 강의 부식 발생 과정의 단계별 변화와 관련하여 고찰하였다. AE 신호를 이용하여 금속 소재의 부식 손상 정도 및 부식 과정의 평가 가능성을 제시하였다.

Keywords

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