Journal
CORROSION SCIENCE
Volume 50, Issue 12, Pages 3410-3415Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2008.09.019
Keywords
Aluminium; Alloy; Polarization; TEM; Anodic films
Funding
- Engineering and Physical Sciences Research Council [EP/D029201/1] Funding Source: researchfish
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Anodic film morphologies on aluminium aerospace alloys are strongly influenced by alloying elements. The present study uses model alloys to interpret the early stages of anodizing of AA2024-T3 and AA7075-T6 aluminium alloys in 0.4 M sulphuric acid electrolyte. Further, coupled model alloys, representative of matrix and second phase regions, are employed as alloy analogues. The findings enable assignment of transient anodic currents during potentiodynamic polarization of the commercial alloys to oxidation of Al2CuMg phase at 0V SCE and of Al2Cu, Al7Cu2Fe and Al-Cu-Fe phases at 5-6V SCE. The phases that oxidize at the latter potential also cause voltage arrests during galvanostatic anodizing. (C) 2008 Elsevier Ltd. All rights reserved.
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