Journal
CORROSION SCIENCE
Volume 144, Issue -, Pages 163-171Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.08.047
Keywords
AA6082 alloy; Al-Mg-Si alloy; Extrusion; Intergranular corrosion; Crystallographic pitting
Funding
- UK Engineering and Physical Sciences Research Council [EP/N007638/1, EP/R001715/1]
- Innovative Foundation of Huazhong University of Science and Technology [2018KFYYXJJ124]
- EPSRC [EP/N007638/1, EP/R001715/1] Funding Source: UKRI
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In the present study, the corrosion behaviour of AA6082 Al-Mg-Si alloy extrusion, consisting of a recrystallized surface region and non-recrystallized fibre structure core, is investigated. It is found that the corrosion penetration rate and propagation path are closely related to grain structure and local plastic deformation. Corrosion morphology changes from intergranular corrosion in recrystallized region to both intergranular and intragranular corrosion of the heavily deformed subgrains in non-recrystallized region. Further, local plastic deformation is quantified by electron backscatter diffraction and transmission Kikuchi diffraction and correlated to corrosion propagation path.
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