Journal
SURFACE AND INTERFACE ANALYSIS
Volume 45, Issue 10, Pages 1452-1456Publisher
WILEY
DOI: 10.1002/sia.5216
Keywords
sol-gel coatings; AA2024-T3 aluminium alloy; alkaline etching; acid cleaning
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Funding
- EPSRC LATEST 2 Programme Grant
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In the present study, the effects of surface pretreatments of AA2024 aluminium alloy on the corrosion protection of the alloy using a sol-gel coating were investigated. It was revealed that the second phase particles that remain after etching and desmutting have a significant impact on the subsequent sol-gel coating which, in turn, influences the overall corrosion protection afforded to the substrate by the sol-gel coating. The removal of second phase particles in the surface region can be achieved by an alternative surface pretreatment using nitric acid. A significant improvement of corrosion protection of sol-gel coated AA2024 aluminium alloy was observed when the surface of the alloy was pretreated with nitric acid. Copyright (c) 2013 John Wiley & Sons, Ltd.
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