The Study of Corrosion Resistance Behavior of Epoxy Nano Composite on Modified Steel using Conversion Coating Based on Hexa fluorozirconic Acid

Document Type : Research Article

Authors

1 Faculty of Polymer Engineering & Color Technology, Islamic Azad University South Tehran Branch

2 Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran

3 Department of Chemistry, Faculty of Basic Science, Islamic Azad University South Tehran Branch

4 Faculty of Polymer Engineering & Color Technology, Amirkabir University of Technologyو Tehran

/amnc.2012.2.7.5

Abstract

In this research, corrosion resistance behavior of epoxy nano composite coatings, containing different percentages of nano clay particles (1%,2%,3% wt), was investigated on modified steel by Electrochemi-- cal Impedance Spectroscopy (EIS). The modification of substrate was accomplished using conversion coatings based on Hexafluorozirconic acid. The morphological properties of conversion coatings was. observed by Field Emission Scanning Electron Microscope (FE-SEM). In addition, the distribution structure of dispersed nano particles was studied by X-Ray Diffraction (XRD). Also, the pull-off test method was employed to measure the adhesion of composite coatings to modified steel substrate. EIS results clearly explained high corrosion resistance (58.7*106 Ohm.cm2) in epoxy matrix containing 3%wt nano clays. Tests results showed that conversion coatings impressively increased the corrosion resistance and coatings adhesion

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