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Characterization of Localized Corrosion in an Al-Cu-Li Alloy

Authors :
Zhihui Tang
George Thompson
Zhihua Sun
Xinxin Zhang
Xiaorong Zhou
Xiaoyun Zhang
Chen Luo
Feng Lu
Source :
Journal of Materials Engineering and Performance. 25:1811-1819
Publication Year :
2016
Publisher :
Springer Science and Business Media LLC, 2016.

Abstract

Corrosion behaviors of recently developed 2A97-T6 aluminum-copper-lithium alloy in sodium chloride solution are investigated using scanning electron and transmission electron microscopies in conjunction with electron backscatter diffraction. It has been found that corrosion product rings were established on the alloy surface as early as 5 min during immersion in sodium chloride solution. Meanwhile, hydrogen continuously evolved from within the rings. Pitting corrosion is evident with crystallographic dependant corrosion channel facets mainly parallel to {100} planes. Non-uniform distribution of misorientation in the 2A97 aluminum alloy results in a portion of grains of relatively high stored energy. Such grains were preferentially attacked, serving as local anodes, during the development of crystallographic pitting.

Details

ISSN :
15441024 and 10599495
Volume :
25
Database :
OpenAIRE
Journal :
Journal of Materials Engineering and Performance
Accession number :
edsair.doi...........9f5253bdf1813dd48c30f2991eeff52c
Full Text :
https://doi.org/10.1007/s11665-016-2010-y