Influence of mixing ratio on the permeability of water and the corrosion performance of epoxy/amine coated un-pretreated Al-2024 evaluated by impedance spectroscopy

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

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20 Citations (Scopus)

Abstract

Water uptake by epoxy coatings was measured in 0.5 M NaCl soln. using a single frequency (1 kHz) capacitance method. The influence of substrates as well as the epoxy/amine mixing ratio on the water permeation coeff. was studied. Corrosion reactions at the coating/substrate interface affected the results of water uptake when the coating is applied on Al-2024 alloy. Consequently, the permeation coeff. of supported coating can be detd. accurately only if the coating is applied on an inert substrate. Excess of epoxy or amine improves the soly. of water in the coating. A low water permeation coeff. was obtained with an epoxy/amine mixing ratio 1.05/1. But this formulation has a relatively poor corrosion performance when applied on an un-pretreated Al-2024 alloy. Under-film corrosion which is the characteristic of defective coatings was obsd. using electrochem. impedance spectroscopy. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)138-141
JournalProgress in Organic Coatings
Volume64
Issue number2-3
DOIs
Publication statusPublished - 2009

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