Theoretical Evaluation of Moisture Protection Using Coatings

Report No. ARL-TR-2016
Authors: Newill, J. F.; McKnight, S. H.; Hoppel, C. P.; Cooper, G. R.; Berman, M. S.
Date/Pages: July 1999; 45 pages
Abstract: A theoretical approach is used to determine important attributes for moisture protection of polymer-matrix composite structures provided by polymeric coatings. Developed solutions are used to evaluate a range of coating materials and thicknesses for thin and thick substrates. The diffusion constants and the saturation levels for the coating material were obtained from the range of available coating materials. The results include typical diffusion patterns for coating materials, saturation of the coating layer, development of moisture through time, and effects of the material properties for the various substrate thicknesses. Moisture diffusion behavior at the substrate-coating interface is also presented. For relatively thick coating layers, the results show that the diffusion constant and the saturation level of the coating must both be low to significantly affect the diffusion process. The study also shows differences in the behavior of the substrate-coating interface.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 1999