Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Localized Corrosion Behavior of Inconel 718 in a Chloride-Containing Aqueous Solution

염수 환경에서 Inconel 718의 국부 부식 거동

  • Lee, Jun-Seob (Materials Science and Engineering, Changwon National University) ;
  • Lee, Yejin (Materials Convergence and System Engineering, Changwon National University) ;
  • Kwon, Soon il (R&d Center, SeAH CSS corporation) ;
  • Shin, Jungho (R&d Center, SeAH CSS corporation) ;
  • Lee, Je-Hyun (Materials Science and Engineering, Changwon National University)
  • 이준섭 (국립창원대학교 신소재공학부) ;
  • 이예진 (국립창원대학교 소재융합시스템공학과) ;
  • 권순일 (세아창원특수강 기술연구소) ;
  • 신정호 (세아창원특수강 기술연구소) ;
  • 이재현 (국립창원대학교 신소재공학부)
  • Received : 2021.11.09
  • Accepted : 2021.11.20
  • Published : 2021.12.31
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Abstract

Localized corrosion behavior of Ni-based Inconel 718 alloy was investigated by electrochemical anodic polarization techniques in NACE TM 0177 A solution of 5 wt% NaCl + 0.5 wt% acetic acid at room temperature. After the solution heat treated at 1080 ℃ for 2.5 h, Inconel 718 was age-hardened at 780 ℃ for 8 h. The microstructure of the alloy surface was investigated by optical microscopic or scanning electron microscopic technique. The austenitic phase with the presence of metal carbides was observed on the surface of Inconel 718. Metal-carbides such as Nb-Mo and Ti-carbide with diameters of approximately 10 and 3 ㎛, respectively, were formed in Inconel 718. Anodic polarization results revealed that localized corrosion was observed at the interface between austenitic phase of a substrate and metal carbides. Difference in electrochemical property between a metal carbide and an austenitic substrate could provide an initiation site for localized corrosion of Inconel 718 surface.

Keywords

Acknowledgement

이 논문은 2019년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임 (No. NRF-2019R1I1A3A01040990).

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