Journal
CORROSION SCIENCE
Volume 143, Issue -, Pages 414-427Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.08.033
Keywords
Aluminium; Alloy; STEM; Interfaces; Segregation; Intergranular corrosion
Funding
- Woodside Energy
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The intergranular corrosion (IGC) of an AA7085-T7452 aluminium alloy forging was determined via ASTM G110 exposure, and rationalised with electron backscattered diffraction and transmission electron microscopy. The alloy microstructure, microchemistry and IGC propensity varied depending on the location within the forging, and thus quarter (t/4) and mid (t/2) thicknesses of the forging were explored herein. The number of IGC fissures and mass loss of specimens was lower in the t/2 position, as a result of higher Cu content in grain boundary precipitates, eta-phase, Mg(Cu-x (=) Zn-0.08-0.32(1-x))(y) (=) (1.4-2.8) and (Zn, Cu)-rich eta-phase, Mg(Cu-x (=) Zn-0.2-0.54(1-x))(y) (=) (4.4-8.5) in the t/2 position, whilst the t/4 position contained eta-phase, Mg(Cu-x (=) Zn-0.09-0.31(1-x))(y) (=) (1.7-2.3) and Zn-rich eta-phase, Mg(Cu-x (=) Zn-0.05-0.12(1-x))(y) (=) (4.4-4.5).
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