Polypyrrole Film Doped with Corrosion-Inhibitors Electropolymerized on AA 1100

AUTOR(ES)

Dalmoro, Viviane

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

05/09/2019

RESUMO

Polypyrrole films doped with dodecylbenzenesulfonate (PPy/DBS) and with oxy-anions tungstate (PPy/DBS/TUN) and vanadate (PPy/DBS/VAN) were potentiostatically electropolymerized on aluminum alloy 1100 (AA1100). The corrosion protection of these films was evaluated by the variation of the corrosion potential (ECORR) with the immersion time and by electrochemical impedance spectroscopy (EIS) measurements in 0.05 mol L-1 NaCl and 0.05 mol L-1 HCl solutions. The EIS measurements suggest that the tungstate and the vanadate play the role of a dopant and an inhibitor. The results presented here show that PPy/DBS/TUN and PPy/DBS/VANprovide a protective effect against the corrosion of the AA1100. It was shown that the oxyanions’ inhibitory action is different depending on the electrolyte pH. In an HCl solution PPy/DBS/TUN films improve protection against aluminum alloy’s corrosion. On the other hand, in a NaCl solution, PPy/DBS/VAN films and PPy/DBS/TUN films act as inhibitor, the former being more effective.

Documentos Relacionados

• pH effects on the ohmic properties of bromophenol blue-doped polypyrrole film
• Polypyrrole coating doped with dihydrogenophosphate ion to protect aluminium against corrosion in sodium chloride medium
• Caracterização microestrutural dos alumínios comerciais AA1100, AA1050 e AA1070 e do alumínio superpuro AA1199
• Corrosion control of aluminum surfaces by polypyrrole films: influence of electrolyte
• Effect of surface roughness and lubrication on the friction coefficient in deep drawing processes of aluminum alloy aa1100 with fem analysis