Electrodeposition of polypyrrole films on aluminum surfaces from a p-toluene sulfonic acid medium

AUTOR(ES)

Liu, Andréa Santos, Bezerra, Marcia Cristina, Cho, Liu Yao

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2009

RESUMO

Electrodeposition of polypyrrole films on aluminum from aqueous solutions containing p-toluene sulfonic acid and pyrrole was performed by cyclic voltammetry and galvanostatic technique. The influence of applied current density on the morphology of the films was studied by Scanning Electron Microscopy. The films displayed a cauliflower-like structure consisting of micro-spherical grains. This structure is related to dopand intercalation in the polymeric chain. Films deposited at higher current density were more susceptible to the formation of pores and defects along the polymeric chain than films deposited at lower current density. These pores allow the penetration of aggressive species, thereby favoring the corrosion process.

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