Revestimentos de polianilina e polianilina/melamina sobre aço inox 304: eletrossíntese em meio aquoso neutro e avaliação da proteção contra corrosão em meio NaCl 0,5 mol/l

Abstract

Polyaniline is one of the most studied conducting polymers and with various applications, including use on steels for corrosion protection. This work aimed to find the conditions for electrosynthesis of polyanilines in neutral aqueous media and to evaluated the corrosion protection of 304 stainless steel. The electrosynthesizeds polyanilines were one pure form (PAni) and one with the addition of melamine (PAni/MM). One of the justifications of this work is the need to deepen the scarce studies in electrosynthesis in neutral aqueous media. In this work, we will see the conditions for electrosynthesis of polyanilines, the UV-visible, FTIR and SEM polyanilines preliminary characterization, the potentiodynamic polarization experiments and impedance spectroscopy of 304 stainless steel without and with films from polyanilines for evaluate the corrosion resistance in NaCl 0,5 mol/L aqueous media. This work showed that electrosynthesis of polyanilines is feasible in neutral aqueous media. In addition, it was verified the following order of corrosion potencial, from lowest to highest: pure 304 stainless steel, 304 stainless steel with PAni and 304 stainless with PAni/MM.