Influence of Anticorrosion Pigments on Protective Properties of Epoxy Coatings

Soviet materials science : a transl. of Fiziko-khimicheskaya mekhanika materialov / Academy of Sciences of the Ukrainian SSR - 2000
V. I. Pokhmurs'kyi1, I. M. Zin'1, L. M. Bilyi1, A. V. Vasylyk1
1Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, Lviv

Tóm tắt

We investigated the impedance characteristics of epoxy coatings which contain chromate pigment or a mixture of phosphate and calcium-containing pigments in their primer layer. The coatings were applied on low-carbon and zinc-coated steels. The studies were performed in a corrosive medium which simulated the acidic atmospheric precipitation. We found that chromate pigment provides a greater passivation effect without significant improvement of the insulating properties of the epoxy coating. The introduction of a chromate-free pigment mixture increases the barrier characteristics of the epoxy coating. As can be concluded from the impedance dependences, the combination of two chromate-free pigments can be regarded as a promising alternative to toxic chromates in epoxy protective coatings, their use being more efficient on a normal steel as compared with a zinc-coated steel.

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Tài liệu tham khảo

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Soviet materials science : a transl. of Fiziko-khimicheskaya mekhanika materialov / Academy of Sciences of the Ukrainian SSR

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