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A morphological study of filiform corrosive attack on chromated and alkaline-cleaned AA2024-T351 aluminium alloy |
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| Authors: | JMC Mol AE Hughes S van der Zwaag |
| Affiliation: | a Department of Materials Science and Technology, Delft University of Technology, Rotterdamseweg 137, NL-2628 AL Delft, The Netherlands b CSIRO, Manufacturing and Infrastructure Technology, Private Bag 33, Clayton South MDC, Victoria 3169, Australia c DSTO, Platforms Sciences Laboratory, P.O. Box 4331, Melbourne, Victoria 3001, Australia d Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, NL-2629 HS Delft, The Netherlands |
| Abstract: | In order to characterise filiform corrosion on a commercial AA2024-T351 aluminium alloy, a detailed microscopical study using SEM and EDS was performed. One set of AA2024-T351 aluminium alloy samples was alkaline-cleaned and deoxidised and chromate conversion coated. Another set was alkaline-cleaned only. Both samples were similarly spray coated with a 42 μm clear polyurethane topcoat. Filaments were subjected to a range of specimen preparation techniques. Sections and top views examined by SEM revealed varying degrees of attack ranging from generalised etching without local attack to severe local attack in the form of pitting, resulting in grain etchout, grain boundary attack and subsurface etchout. EDS revealed the presence of chloride deep into the pits and the subsurface etchout. |
| Keywords: | A Aluminium A Alloy A Organic coatings B SEM C Pitting corrosion |
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