Utilização de polímero condutor como revestimento protetor contra corrosão da liga de alumínio AA-2014 F

Abstract

Aluminum is widely used due to its technical and economic advantages, as well as due to its high level of corrosion protection provided by the oxide film forme don the surface of the metal. In the current study deposition of polyaniline (PAni) on three different Al alloys (AA-2014 F) was studied. The electrodepositions were realized from aqueous solutions of either phosphoric acid that contained the aniline monomer, using the techniques of cyclic voltammetry and chronoamperometry. The films were characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM). To evaluate the resistance of the films under conditions aggressive to Al potentiodynamic polarization curves were performed in 0,6 mol L^-1 NaCl. Data obtained from the potentiodynamic polarization curves indicate that the films obtained protect the alloys studied against corrosion. Considering the film in the undoped form for the alloy AA-2014 F, there was a positive shift in the corrosion potential of 61.2 mV. The present study demonstrates that PAni films are viable alternatives to other protection methods