Role of oxygen in the galvanic interaction between polypyrrole and aluminum alloy

Mao, Yan; Tallman, Dennis E.; Bierwagen, Gordon P.

doi:10.1016/j.electacta.2008.08.008

Cited by 33 publications

(39 citation statements)

References 35 publications

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“…Along with this, in the atmospheric conditions where there is presence of oxygen, an oxygen doping mechanism might be occurring due to the presence of the neutral form of PPy along with its oxidized form as was shown in the XPS (results as displayed in as Fig. 6) [76]. Neutral and reduced form of PPy has found to providing cathodic protection to the underlying aluminum 2024-T3 substrate [22].…”

Section: Galvanic Coupling Measurementsmentioning

confidence: 90%

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The effect of polymer morphology on the performance of a corrosion inhibiting polypyrrole/aluminum flake composite pigment

Jadhav

Vetter

Gelling

2013

Electrochimica Acta

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Section: Galvanic Coupling Measurementsmentioning

confidence: 90%

“…This was due to the PPy which is originally in the oxidized form due to its p-doped nature. In deaerated conditions this PPy in contact with aluminum tends to be reduced [76]. This reduction of PPy results into the oxidation of aluminum flakes which is in its contact.…”

Section: Galvanic Coupling Measurementsmentioning

confidence: 95%

The effect of polymer morphology on the performance of a corrosion inhibiting polypyrrole/aluminum flake composite pigment

Jadhav

Vetter

Gelling

2013

Electrochimica Acta

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“…It has been observed that, in contact with aluminum alloy, PPy tends to be reduced as it is coupled with aluminum alloy. 57 The reduction of PPy induces the anodic dissolution of aluminum; in this case activating Al flakes which further protects sacrificially the underlying aluminum 2024-T3 substrate. The dissolution maintained high coupling current levels.…”

Section: Galvanic Coupling Measurementsmentioning

confidence: 99%

“…These include anodic passivation, surface ennobling, mediation of oxygen reduction, cathodic protection, barrier protection after initial galvanic coupling, and an intelligent dopant release mechanism. 28,29,[57][58][59] The efficacy of corrosion protection depends on application conditions including substrate preparation, type of substrate (Al or steel), methods of application, and different conductive forms of CPs. 39,60 In the present work, a corrosion inhibiting dopant release mechanism, galvanic contact of PPy with Al flakes, and barrier protection resulting from the lamellar nature of Al flakes are suggested to provide the corrosion inhibition.…”

Section: Introductionmentioning

confidence: 99%

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

2015

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Polypyrrole (PPy) doped with either tungstate or vanadate as counter anions was synthesized by chemical oxidative polymerization on the surface of aluminum (Al) flakes. This resulted in the deposition of PPy on the surface of the Al flakes leading to the formation of doped PPy/Al flake composite pigments. These composite pigments were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, conductive-atomic force microscopy, four-point probe conductivity, and X-ray photoelectron spectroscopy. Furthermore, these composites were incorporated in an epoxy-amide binder system in order to formulate a primer for an aluminum 2024-T3 substrate. The coatings were exposed to the Prohesion test conditions and corrosion resistance properties were monitored by electrochemical impedance spectroscopy, DC polarization, galvanic coupling, and scanning electrochemical microscopy measurements. It was found that the doped PPy/Al flake coatings provided sacrificial protection to the underlying aluminum 2024-T3 substrate. Additionally, the release of dopants from PPy backbone resulted in the passivation in the defect areas improving the corrosion protection ability.

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“…However, the PPy may be again reoxidized by the oxygen from the solution, 40 i.e., PPy-coated acts as an electrocatalyst.…”

Section: Corrosion Performancementioning

confidence: 99%

Polypyrrole coating doped with dihydrogenophosphate ion to protect aluminium against corrosion in sodium chloride medium

Martins

Diblikova

Bazzaoui

et al. 2012

J. Braz. Chem. Soc.

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A electrodeposição do polipirrole (PPy) sobre alumínio em soluções de ácido fosfórico foi obtida através de técnicas potenciodinâmicas, potenciostáticas e galvanostáticas. O comportamento do alumínio revestido com polipirrole em meio de cloreto de sódio foi investigado através do potencial de circuito aberto e espectroscopia de impedância electroquímica. É proposto um mecanismo para explicar o efeito benéfico do íon dihidrogenofosfato na passivação do alumínio.The electrodeposition of polypyrrole (PPy) on aluminium electrodes has been achieved in phosphoric acid medium by using potentiodynamic, potentiostatic and galvanostatic techniques. The corrosion behavior of polypyrrole on aluminium in sodium chloride medium has been investigated by open circuit potential and electrochemical impedance spectroscopy. A mechanism to explain the beneficial effect of PPy-doping dihydrogenophosphate ion in the passivation of aluminium is proposed.

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Role of oxygen in the galvanic interaction between polypyrrole and aluminum alloy

Cited by 33 publications

References 35 publications

The effect of polymer morphology on the performance of a corrosion inhibiting polypyrrole/aluminum flake composite pigment

The effect of polymer morphology on the performance of a corrosion inhibiting polypyrrole/aluminum flake composite pigment

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

Polypyrrole coating doped with dihydrogenophosphate ion to protect aluminium against corrosion in sodium chloride medium

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