Polypyrrole electropolymerized on aluminum alloy 1100 doped with oxalate and tungstate anions

Abstract

Polypyrrole films doped with oxalic acid and tungstate were potentiostatically electropolymerized on aluminum alloy 1100. Two statistical factorial designs (fractional and complete) were used to study the influence of the synthesis variables on the film performance against corrosion. Corrosion protection of the polypyrrole films doped with oxalate and tungstate anions (PPy/OXA/W) on the aluminum alloy was evaluated by potentiometric and electrochemical impedance spectroscopy (EIS) measurements in a 0.05 mol L -1 NaCl solution. The results obtained showed that the best performance against corrosion was detected with the PPy/OXA/W film synthesized at 1.0 V, 1.5 C in 0.2 mol L -1 pyrrole, 0.1 mol L -1 oxalic acid and 0.05 mol L -1 sodium tungstate solutions provide a protective effect against corrosion.

Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

“…[7][8][9][10] CPs possess several attractive properties including electrical conductivity, 11 good thermal stability, 12 catalytic nature, nontoxicity, and easy synthesis by chemical and electrochemical oxidative methods. 13 CPs are employed in a variety of applications such as sensors and electrochemical devices, 14,15 actuators, 16 capacitors, 17 batteries, 18,19 light emitting diodes, 20,21 control release devices, 22,23 solar cells, 24 radar and electromagnetic interference shielding, 25,26 and corrosion protection of metals and their alloys.…”

“…The improvement in corrosion protection was attributed to adsorption of tungstate anions at the defects and formation of passive film. 12 Vanadate has been shown to provide corrosion inhibition on aluminum 2024-T3 by forming adsorbed layer on its surface. 51 Vanadate adsorption, furthermore, reduced the oxygen reduction rate by blocking the sites for reduction.…”

Proteção Do Alumínio 2024 Por Filmes De Polipirrol Depositados Em Ácido P-Tolueno Sulfônico

“…As propriedades físico-químicas do PPy, tais como estabilidade química/térmica, condutividade elétrica, baixa solubilidade do polímero em solventes orgânicos e em água, e a facilidade de síntese por métodos químicos e eletroquímicos o conferem destaque no campo da pesquisa (WANG; LI; YL, 2001; CASTAGNO; AZAMBUJA; DALMORO, 2009). A combinação dessas características com propriedades elétricas e ópticas levam o PPy à crescente aplicação tecnológica, destacando seu uso como material de eletrodo de supercapacitores (BAHLOUL et al, 2013;HASHMI;UPADHYAYA, 2002;TSAI;CHEN;DO, 2004), revestimento de compósito de nanotubos de carbono (HUGHES, et.…”

Electrocatalysis of Methanol Oxidation on Polypyrrole Electropolymerized on Aluminum Alloy 1100

“…The electropolymerization of polypyrrole on active metals has proved to be a difficult undertaking, since the potential required to oxidize the monomer is higher than the corrosion potential of such metals [7,8]. Previous papers have reported the electrochemical polymerization of polypyrrole on ferrous and nonferrous substrates, as well as on aluminum [1,9]. The reproducible and porous surfaces as well as the low cost of aluminum alloys are some advantages over other solid electrodes.…”

“…The reproducible and porous surfaces as well as the low cost of aluminum alloys are some advantages over other solid electrodes. The films obtained by the authors were analyzed and characterized by electrochemical techniques [9]. It is known that the methanol oxidation reaction occurs through a complex mechanism involving both dehydrogenation and oxidation of different metals supported on alumina [10] or even electrooxidation on Pt electrodes [11].…”