Preparation of Polyaniline Microemulsion and Anticorrosion Performance of Its Composite Coatings with Versatate-Fluoro-Acrylate Emulsion

Abstract

Polyaniline(PANI) microemulsion, which is miscible with acrylate emulsion, was synthesized with sodium dodecyl sulfate(SDS) as emulsifier. PANI/VFAc composite emulsions were prepared by blending PANI microemulsion and the versatate modified acrylate emulsion containing fluorine(versatate- fluoro- acrylate emulsion, VFAc). Then PANI/VFAc composite emulsion was applied on Q235 steel surface to prepare the composite anticorrosion coatings. The molecular structure and particle size of PANI were characterized by Fourier transformation infrared spectrum(FT- IR), transmission electron microscopy(TEM) and particle size analyzer. The influence of different proportion of PANI microemulsion and VFAc emulsion on properties such as hydrophobic, wet adhesion and anticorrosion of the formed coatings was studied. The results show that the composite coating exhibits the best hydrophobic property and corrosion resistance when the proportion of PANI microemulsion and VFAc emulsion is 1: 2. The anticorrosion mechanism of PANI/VFAc composite coating on Q235 steel was proposed.