Electrochemical examining behavior of epoxy coating incorporating zinc-free phosphate-based anticorrosion pigment |
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| Authors: | R Naderi M Mahdavian A Darvish |
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| Affiliation: | 1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran;2. Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran;3. Polymer Engineering Department, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran |
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| Abstract: | Protective performance of the epoxy primer containing strontium aluminum polyphosphate (SAPP) as a zinc-free phosphate-based anticorrosion pigment is aimed to assess in this work through taking advantage of electrochemical impedance spectroscopy (EIS) and electrochemical noise method (ENM). The absence of zinc offers an excellent environmentally friendly profile to the class of inhibiting compound. In the pigment extracts, the electrochemical techniques revealed superiority of SAPP compared to the conventional zinc phosphate (ZP). The behavior was connected to precipitation of a protective layer on the surface exposed to SAPP. In comparison with ZP, the most effective SAPP content in the protective primer was then determined using EIS. |
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| Keywords: | Mild steel EIS Electrochemical noise Protective coatings Anticorrosion pigments |
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