Polypyrrole Bilayer Coating Doped with Phosphoric Acid and Salicylic Acid and its Efficiency for Protecting Carbon Steel against Corrosion
DOI:
https://doi.org/10.19142/rpq.v17i34.702Keywords:
polypyrrole, acetonitrile, bilayer, corrosion, carbon steelAbstract
In this work a coating of polypyrrole-bilayer was synthesized galvanostatically in acetonitrile, on the carbon steel surface. Phosphoric and salicylic acids were used as dopants for the inner and outer layers, respectively. The morphology of the coating was investigated by scanning electron microscopy and indicated the formation of a homogeneous and compact surface. The chemical composition of the coating was analyzed by infrared spectroscopy and indicated the presence of polypyrrole and dopants bands. In addition, the corrosion protection efficiency of carbon steel was evaluated by open circuit potential and potentiodynamic polarization tests in chloride media. It was verified a displacement of the corrosion potential towards the positive direction and lower anodic current densities for the carbon steel surface coated with the polypyrrole-bilayer in relation to the uncoated metal. Furthermore, the coating morphology remained intact and flawless even after this test.
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