Electrochemical preparation and characterisation of polypyrrole on aluminium in aqueous solution

Saidman, S.B.; Bessone, J.B.

doi:10.1016/s0022-0728(02)00685-x

Cited by 81 publications

(46 citation statements)

References 16 publications

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“…There was a slight increase in the breakdown potential, approximately 35 mV, for the polyaniline-coated electrodes. Saidman and Bessone [9] have shown that the pitting potential recorded for polypyrrole-coated aluminium depends on the electrosynthesis conditions, with lower pitting potentials being recorded for coatings formed at higher potentials due to degradation of the polypyrrole. However, for this polyaniline system, the breakdown potentials appeared to be independent of the electrosynthesis conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The mediator was found to reduce the deposition potential by nearly 500 mV compared with that found in the absence of the mediator. Saidman and Bessone [9] have reported also the preparation of polypyrrole at aluminium from a nitric acid solution. They found that the coating was deposited initially at flaws in the passive aluminium oxide film.…”

Section: Introductionmentioning

confidence: 99%

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The electrochemical deposition of polyaniline at pure aluminium: electrochemical activity and corrosion protection properties

Conroy

Breslin

2003

Electrochimica Acta

127

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Polyaniline films were electrodeposited at pure aluminium from a tosylic acid solution containing aniline. These polymer films exhibited similar characteristics as pure polyaniline electrosynthesized at an inert platinum electrode, when removed from their respective substrates and dissolved in NMP. Both polymers had similar molecular weights and similar UV-visible absorption spectra. However, the aluminium substrate had a considerable effect on the electrochemical activity of the films. The polyaniline films deposited at aluminium appeared to lose electroactivity and the electrochemical impedance data were governed by the oxidized aluminium substrate. This is consistent with a galvanic interaction between the polymer and the aluminium substrate, giving rise to oxidation of the aluminium and reduction of the polymer. The polyaniline deposits appeared to offer only a slight increase in the corrosion resistance of aluminium. Surface potential measurements, using a scanning vibrating probe, showed that attack initiated underneath the polymer under anodic polarization conditions, indicating that chloride anions diffuse across the polymer to react at the underlying aluminium substrate. #

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The electrochemical deposition of polyaniline at pure aluminium: electrochemical activity and corrosion protection properties

Conroy

Breslin

2003

Electrochimica Acta

127

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“…The authors reported a homogeneous and adherent PPy film which covered the substrate surface when they applied a constant potential between 0.7 to 1.15 V vs. SCE at pH 12. They did not observe any growth of the PPy on the substrate at a pH between 4 and 11 or ≥13 [17].…”

Section: Phmentioning

confidence: 92%

“…Saidman et al [17] studied PPy growth in nitrate solutions on aluminium substrates at different pH's. Aluminium presented a passive oxide layer which protects and inhibits the oxidation of the monomer and thus film deposition.…”

Section: Phmentioning

confidence: 99%

“…Aluminium presented a passive oxide layer which protects and inhibits the oxidation of the monomer and thus film deposition. As the pH increases, the passive layer dissolves partially allowing PPy deposition; however, the polymerisation competes with the dissolution of the metal which can prevent the deposition [17,18]. The authors reported a homogeneous and adherent PPy film which covered the substrate surface when they applied a constant potential between 0.7 to 1.15 V vs. SCE at pH 12.…”

Section: Phmentioning

confidence: 99%

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Electrodeposited conductive polymers for controlled drug release: polypyrrole

Alshammary

Walsh

Herrasti

et al. 2015

J Solid State Electrochem

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Over the last 40 years, electrically conductive polymers have become well established as important electrode materials. Polyanilines, polythiophenes and polypyrroles have received particular attention due to their ease of synthesis, chemical stability, mechanical robustness and the ability to tailor their properties. Electrochemical synthesis of these materials as films have proved to be a robust and simple way to realise surface layers with controlled thickness, electrical conductivity and ion transport. In the last decade, the biomedical compatibility of electrodeposited polymers has become recognised; in particular, polypyrroles have been studied extensively and can provide an effective route to pharmaceutical drug release. The factors controlling the electrodeposition of this polymer from practical electrolytes are considered in this review including electrolyte composition and operating conditions such as the temperature and electrode potential. Voltammetry and current-time behaviour are seen to be effective techniques for film characterisation during and after their formation. The degree of take-up and the rate of drug release depend greatly on the structure, composition and oxidation state of the polymer film. Specialised aspects are considered, including galvanic cells with a Mg anode, use of catalytic nanomotors or implantable biofuel cells for a self-powered drug delivery system and nanoporous surfaces and nanostructures. Following a survey of polymer and drug types, progress in this field is summarised and aspects requiring further research are highlighted.

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Corrosion protection of pure aluminium and aluminium alloy (AA7075) in salt solution with silane‐based sol–gel coatings

Younis

Ensinger

El‐Sabbah

et al. 2012

Materials & Corrosion

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Sol–gel films of tetraethoxysilane (TEOS), phenyltriethoxysilane (PTES) and phenyltrimethoxysilane (PTMS) were prepared on aluminium and aluminium alloy AA7075 and characterised. The corrosion inhibition properties of uncoated and coated specimens were evaluated with potentiodynamic polarisation scan, linear polarisation resistance and open circuit potential measurements. With scanning electron microscopy and optical microscopy effects of the sol–gel coating were shown. Weight loss measurements were performed at different pH‐values. More hydrophobic coatings as PTMS show a considerably better corrosion inhibition capacity as compared to the capacity provided by less hydrophobic ones as TEOS and PTES.

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Electrochemical preparation and characterisation of polypyrrole on aluminium in aqueous solution

Cited by 81 publications

References 16 publications

The electrochemical deposition of polyaniline at pure aluminium: electrochemical activity and corrosion protection properties

The electrochemical deposition of polyaniline at pure aluminium: electrochemical activity and corrosion protection properties

Electrodeposited conductive polymers for controlled drug release: polypyrrole

Corrosion protection of pure aluminium and aluminium alloy (AA7075) in salt solution with silane‐based sol–gel coatings

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