Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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TEM Characterization of Oxide Films Formed on Al1050 and Al7075 Alloys under Atmospheric Corrosion Conditions

대기 부식에 의해 생성된 Al1050 및 Al7075 알루미늄 합금 산화막에 대한 투과전자현미경 분석

  • Kim, Sungyu (School of Mechanical Engineering, Pusan National University) ;
  • Lee, Chanhyeong (School of Mechanical Engineering, Pusan National University) ;
  • Bahn, Chi Bum (School of Mechanical Engineering, Pusan National University)
  • 김선규 (부산대학교 기계공학부) ;
  • 이찬형 (부산대학교 기계공학부) ;
  • 반치범 (부산대학교 기계공학부)
  • Received : 2017.10.18
  • Accepted : 2017.12.05
  • Published : 2017.12.31
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Abstract

Al1050 and Al7075 alloy specimens were exposed to atmospheric conditions for maximum 12 months and analyzed by Transmission Electron Microscopy (TEM) to characterize the early-stage corrosion behavior and thin surface oxide layers. By comparing of oxide films between Al1050 and Al7075 alloys, it is concluded that Al7075 has a relatively thicker surface oxide film than Al1050 but Al1050 has relatively more significant oxygen penetration through grain boundaries. The oxygen penetration through grain boundaries appeared to be influenced by intermetallic particles at the grain boundary. In the case of aluminum alloys, localized corrosion like pitting or intergranular corrosion should be considered as well as uniform corrosion when estimating the atmospheric corrosion rate.

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