Absorption of water and corrosion performance of a clear and pigmented epoxy coating on Al-2024 alloy

A. Foyet, T. Wu, A. Kodentsov, L.G.J. Ven, van der, G. With, de, R.A.T.M. Benthem, van

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
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Abstract

The corrosion performance of Al-2024 substrates coated with an epoxy clear coating and a pigmented epoxy coating was investigated. The absorption of water in the pigmented coating was high compared to the clear coating. The clear coating provided a good barrier which is stable beyond 120 days of immersion in a 0.5 M NaCl solution. The shape of the Nyquist plot of the pigmented coating changed with immersion time and reveals the existence of physico-chemical processes in the coating and/or at the interface. Its impedance magnitude at low frequencies remained very high (~ 109 .cm2) after 72 days of immersion in sodium chloride solution. Both coatings exhibited good dry adhesion on Al-2024. The wet adhesion of the clear coating was poor while the stress (~ 9 MPa) required in a pull off adhesion test of the wet pigmented coating remained high.
Original languageEnglish
Pages (from-to)31-39
Number of pages9
JournalECS Transactions
Volume25
Issue number29
DOIs
Publication statusPublished - 2010

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