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.

Abstract
 1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 References

• 최희수(경상대학교 나노신소재융합공학과) | Heesoo Choi (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University)
• 이다은(경상대학교 나노신소재융합공학과) | Daeun Lee (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University)
• 안수진(경상대학교 나노신소재융합공학과) | Soojin Ahn (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University)
• 이철주(한국항공우주산업 구조해석팀) | Cheoljoo Lee (Structural Analysis Team, Korea Aerospace Industries, LTD.)
• 김상식(경상대학교 나노신소재융합공학과) | Sangshik Kim (Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University) Corresponding author