Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Stress Corrosion Cracking Sensitivity of High-Strength 2xxx Series Aluminum Alloys in 3.5 % NaCl Solution

항공용 고강도 2xxx계 알루미늄 합금의 3.5 % 염수 환경에서의 응력부식균열 민감도

  • Choi, Heesoo (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) ;
  • Lee, Daeun (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) ;
  • Ahn, Soojin (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) ;
  • Lee, Cheoljoo (Structural Analysis Team, Korea Aerospace Industries, LTD.) ;
  • Kim, Sangshik (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University)
  • 최희수 (경상대학교 나노신소재융합공학과) ;
  • 이다은 (경상대학교 나노신소재융합공학과) ;
  • 안수진 (경상대학교 나노신소재융합공학과) ;
  • 이철주 (한국항공우주산업 구조해석팀) ;
  • 김상식 (경상대학교 나노신소재융합공학과)
  • Received : 2018.08.18
  • Accepted : 2018.11.29
  • Published : 2018.12.27
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Abstract

For the aerospace structural application of high-strength 2xxx series aluminum alloys, stress corrosion cracking(SCC) behavior in aggressive environments needs to be well understood. In this study, the SCC sensitivities of 2024-T62, 2124-T851 and 2050-T84 alloys in a 3.5 % NaCl solution are measured using a constant load testing method without polarization and a slow strain rate test(SSRT) method at a strain rate of 10-6 /sec under a cathodic applied potential. When the specimens are exposed to a 3.5 % NaCl solution under a constant load for 10 days, the decrease in tensile ductility is negligible for 2124-T851 and 2050-T84 specimens, proving that T8 heat treatment is beneficial in improving the SCC resistance of 2xxx series aluminum alloys. The specimens are also susceptible to SCC in a hydrogen-generating environment at a slow strain rate of $10^{-6}/sec$ in a 3.5 % NaCl solution under a cathodic applied potential. Regardless of the test method, low impurity 2124-T851 and high Cu/Mg ratio 2050-T84 alloys are found to have relatively lower SCC sensitivity than 2024-T62. The SCC behavior of 2xxx series aluminum alloys in the 3.5 % NaCl solution is discussed based on fractographic and micrographic observations.

Keywords

References

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