A new approach to using submicron emeraldine-base polyaniline in corrosion-resistant epoxy coatings |
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Authors: | Davood Zaarei Ali Asghar Sarabi Farhad Sharif Mohsen Moazzami Gudarzi Seyed Mahmoud Kassiriha |
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Affiliation: | (1) Polymer Faculty, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran; |
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Abstract: | The present work reports on a new approach to the preparation of special corrosion-resistant epoxy coatings. The aminic hardener
of these coatings contained emeraldine-base polyaniline (EB-PANi). The aminic hardener was prepared by dispersion of EB-PANi
in 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine employing sonication, centrifuging and submicron filtering methods. The
state of dispersion and dissolution of these coating materials, during different stages of preparation, were characterized
by optical microscopy and scanning electron microscopy. The corrosion resistances of resulting coatings were measured by electrochemical
impedance spectroscopy (EIS) and salt spray methods. As little as 0.5% EB in initial mixture of EB-hardener compositions led
to relatively better corrosion protection of resulting coating compared with neat resin coating. Presence of initial 2.5%
of EB in the hardener and its processing through our approach resulted in the formulation of an epoxy coating with superior
corrosion protection properties. |
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