Abstract
Water-diffusion coefficient water solubility and oxygen permeability measurements have been performed on free-standing membranes of epoxy-based organic coatings for different values of paint composition. Concomitant direct (d.c.) and alternating (a.c.) current measurements were carried out on coated mild steel in order to investigate the protection exhibited by the coatings in neutral aerated 0.5 M NaCl. A general model has been used to analyse the a.c. data in terms of reactions occurring during the interaction of the coated metal with the aggressive environment. A correlation between transport properties of free films and the protective properties of paints has also been attempted. No relationship was found between the water permeability and the coating performance over exposure time, whereas the oxygen permeability seems to be responsible for coating effectiveness at later stages. The electrical resistivity of the coatings and its dependence on both the composition and water content has been related to early failures.
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Bellucci, F., Nicodemo, L. & Latanision, R.M. The effect of composition on the performance of epoxy paints. J Mater Sci 25, 1097–1103 (1990). https://doi.org/10.1007/BF03372209
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DOI: https://doi.org/10.1007/BF03372209