Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of Solution Annealing Heat Treatment on the Localized Corrosion Resistance of Inconel 718

Inconel 718의 국부 부식 저항성에 미치는 용체화 열처리의 영향

  • Yoonhwa Lee (Materials Convergence and System Engineering, Changwon National University) ;
  • Jun-Seob Lee (Materials Convergence and System Engineering, Changwon National University) ;
  • Soon Il Kwon (R&D Center, SeAH CSS corporation) ;
  • Jungho Shin (R&D Center, SeAH CSS corporation) ;
  • Je-hyun Lee (Materials Convergence and System Engineering, Changwon National University)
  • 이윤화 (국립창원대학교 소재융합시스템공학부) ;
  • 이준섭 (국립창원대학교 소재융합시스템공학부) ;
  • 권순일 (세아창원특수강 기술연구소) ;
  • 신정호 (세아창원특수강 기술연구소) ;
  • 이재현 (국립창원대학교 소재융합시스템공학부)
  • Received : 2023.10.17
  • Accepted : 2023.10.24
  • Published : 2023.10.30
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Abstract

The localized corrosion resistance of the Ni-based Inconel 718 alloy after solution heat treatment was evaluated using electrochemical techniques in a solution of 25 wt% NaCl and 0.5 wt% acetic acid. Solution heat treatment at 1050 ℃ for 2.5 hours resulted in an increased average grain diameter. Both Ti carbides (10 ㎛ diameter) and Nb-Mo carbides (1 - 9 ㎛ diameter) were distributed throughout the material. Despite heat treatment, the shape and composition of these carbides remained consistent. An increase in solution temperature led to a decrease in pitting potential value. However, the pitting potential value of solution heat-treated Inconel 718 was consistently higher than that of as-received Inconel 718 at all tested temperatures. Localized corrosion initiation occurred at 0.4 VSSE in a temperature environment of 80 ℃ for both as-received and solution heat-treated Inconel 718 alloys. X-ray photoelectron spectroscopic analysis indicated that the composition of the passive film formed on specimen surfaces remained largely unchanged after solution heat treatment, with O1s, Cr2p3/2, Fe2p3/2, and Ni2p3/2 present. The difference in localized corrosion resistance between as-received and solution heat-treated Inconel 718 alloys was attributable to microstructural changes induced by the heat treatment process.

Keywords

Acknowledgement

이 논문은 2023 ~ 2024년도 창원대학교 자율연구과제 연구비 지원으로 수행된 연구결과임.

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