Studying the corrosion resistance of an epoxy clay nanocoating using salt spray test and electrochemical impedance spectroscopy

Document Type : Research Article

Authors

1 Department of Polymer Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr

2 Polymer Engineering Department, Sahand University of Technology, Tabriz

/amnc.2012.1.2.1

Abstract

In this study, attempts were made to investigate the effect of different concentrations of Cloisite 30B on the corrosion resistance of an epoxy coating. The coatings were prepared at Cloisite 30B’s weight percentage of 0, 1, 2, 3 and 5. Maximum diameter of blister, water penetrating and corrosion along scratch were all used to investigate the corrosion resistance of coatings at salt spray test. The results of salt spray test showed that using 3 and 5 wt% of nanoclay improved the corrosion resistance of epoxy efficiently. Also the EIS results showed that adding 5wt% of nano clay to epoxy caused an increase in electrical resistances by 55% and a reduction in capacitance of coating by 17%. Lamellar structure, high aspect ratio and a possible exfoliated orientation of Cloisite 30B in the coatings might make an improvement in corrosion resistance of epoxy.

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