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2018 Vol.28, Issue 12 Preview Page
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

Heesoo Choi1
,
Daeun Lee1
,
Soojin Ahn1
,
Cheoljoo Lee2
,
Sangshik Kim1†
최 희수1
,
이 다은1
,
안 수진1
,
이 철주2
,
김 상식1†
1Dept. of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University, Jinju 52828, Republic of Korea
2Structural Analysis Team, Korea Aerospace Industries, LTD., Sacheon 52529, Republic of Korea
1경상대학교 나노신소재융합공학과
2한국항공우주산업 구조해석팀
†Corresponding author : E-Mail : sang@gnu.ac.kr (S. Kim, Gyeongsang Nat'l Univ.)
December 2018. pp. 738-747
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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
stress corrosion cracking
2xxx series aluminum alloy
3.5% NaCl solution
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 28
  • No :12
  • Pages :738-747
  • Received Date : 2018-08-18
  • Revised Date : 2018-11-27
  • Accepted Date : 2018-11-29
  • DOI :https://doi.org/10.3740/MRSK.2018.28.12.738
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