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ARTICLE

Preparation and characterization of poly(o-toluidine)/nano TiO₂ composite and study of their anticorrosion properties blended with epoxy resin

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a School of Metallurgy, Northeastern University, Shenyang 110819, China
b Liaoning Key Laboratory for Metallurgical Sensor and Technology, Northeastern University, Shenyang 110819, China

* Corresponding Author: e-mail:

Journal of Polymer Materials 2017, 34(4), 797-808.

Abstract

In this investigation, HCl doped poly(o-toluidine)/nano TiO₂ composite was prepared using in situ polymerization method. The composition and structure of the composite were characterized by Fourier transformation infrared spectroscopy (FT-IR), UV-visible spectroscopy (UV-vis), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Thermogravimetric analysis (TGA). The anticorrosion properties of the epoxy resin blended with poly(o-toluidine)/ nano TiO₂ composite were studied in 3.5% NaCl solution by electrochemical measurements. Potentiodynamic polarization measurement showed that poly(o-toluidine)/nano TiO₂ /epoxy composite coating acted as a highly efficient corrosion protection layer on steel with 97.85% protection efficiency. Electrochemical impendence spectroscopy measurement showed that poly(o-toluidine)/nano TiO₂ /epoxy composite coating exhibited a higher charge transfer resistance and effectively decreased the permeation of water and corrosion substances. The highly efficient corrosion protection of the epoxy coating containing poly(o-toluidine)/nano TiO₂ composite may be derived from the passivation and barrier effects.

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