Sol–gel coatings modified with zeolite fillers for active corrosion protection of AA2024
By Dias, S.A.S.; Lamaka, S.V.; Nogueira, C.A.; Diamantino, T.C. & Ferreira, M.G.S.
Published in Corrosion Science
NULL
2012
Abstract
This work presents a new approach to develop active protection coating systems. Zeolite microparticles were used as reservoirs for Ce (III). The zeolites were introduced into silica–zirconia sol–gel films, improving the barrier properties of the coating and conferring active corrosion protection to the AA2024 substrate. The corrosion process changes the pH of solution locally causing release of inhibitor that precipitates in the cathodic areas. Intermetallic inclusions seem to be sites prone to the formation of these cerium rich precipitates. The protection properties of the modified coatings were assessed using EIS.
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