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A morphological study of filiform corrosive attack on cerated AA2024-T351 aluminium alloy |
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| Authors: | AE Hughes BRW Hinton |
| Affiliation: | a CSIRO, Manufacturing and Infrastructure Technology, Private Bag 33, Clayton South MDC, Vic. 3169, Australia b Department of Materials Science and Technology, Delft University of Technology, Rotterdamseweg 137, NL-2628 AL Delft, The Netherlands c Defense Science and Technology Organisation, P.O. Box 4331, Melbourne, Vict. 3001, Australia d Faculty of Aerospace Engineering, Fundamentals of Advanced Materials Group, Delft University of Technology, Kluyverweg 1, NL-2629 HS Delft, The Netherlands |
| Abstract: | SEM and EDS studies were carried out to characterise filiform attack on a cerated AA2024-T351 aluminium alloy with a polyurethane topcoat. The filiforms developed on AA2024-T351 were sectioned, stripped of corrosion product and etched to reveal the grain structure. Examination of sections through the filaments and the filaments themselves, revealed severe local attack in the form of pitting resulting in grain etch out, grain boundary attack and subsurface etch out. Chloride ions were detected deep within pits and the subsurface etch out. The observations were similar to those found with filiform corrosion on chromated and coated surfaces. The observations led to development of a filiform corrosion model naming the volume expansion of the corrosion product as the principal cause for delamination. |
| Keywords: | A Aluminium A Rare earth elements A Organic coatings B SEM C Pitting corrosion A Model |
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