Polypyrrole Films Doped with Phosphomolybdate Anions on Al Surfaces – Formation and Corrosion Protection Characterisation

Anicăi, Liana; Florea, Andreea; Buda, Mihai; Visan, Teodor

doi:10.1524/zpch.2013.0357

Cited by 4 publications

(2 citation statements)

References 48 publications

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“…The values of the corrosion current density, i corr and corrosion potential, E corr (determined by Tafel extrapolation of both cathodic and anodic polarization curves) as well as values of the polarization resistance, R p (calculated from the Stern-Geary equation) [59] are listed in Table 3. Corrosion rates, CR, were also obtained from these curves.…”

Section: Characterization Of Indo Doped Ppy Coatingsmentioning

confidence: 99%

Electrochemical Synthesis of Polypyrrole and Polypyrrole-Indomethacin Coatings on NiCr Alloys Involving Deep Eutectic Solvents

Golgovici

Cârlan

Popescu

et al. 2020

Metals

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There is an increased interest in the use of the deep eutectic solvents (DESs) as electrolytic media for electrochemical synthesis of conducting polymers, which could influence their characteristics. Moreover, the polypyrrole layers represent an attractive route for pharmaceutical drug release. The paper presents several experimental results regarding the electrodeposition of polypyrrole and of polypyrrole-indomethacin coatings on nickel-chromium NiCr alloy substrates widely used in dentistry, involving DES-based electrolytes, namely eutectic mixtures of choline chloride and malonic acid. This type of electrolyte also allowed an enhanced dissolution of indomethacin as compared to aqueous ones. The electropolymerization process has been investigated by cyclic voltammetry and chronoamperometry. The obtained indomethacin containing polymeric coatings have been thoroughly characterized involving scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, contact angle measurements in simulated body fluid (SBF) and indomethacin release studies. Adherent and uniform polypyrrole-indomethacin layers have been obtained on NiCr alloy substrates. The release tests showed that the polypyrrole coatings containing indomethacin may deliver the drug molecules for longer periods of at least 17 days. The maximum released amount was around 99.6% suggesting these layers may act as an active reservoir for indomethacin. Kinetics analysis based on the Korsmeyer–Peppas model suggested the diffusion of the drug out of the polymer layer as the most probable mechanism governing the release.

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Section: Characterization Of Indo Doped Ppy Coatingsmentioning

confidence: 99%

Electrochemical Synthesis of Polypyrrole and Polypyrrole-Indomethacin Coatings on NiCr Alloys Involving Deep Eutectic Solvents

Golgovici

Cârlan

Popescu

et al. 2020

Metals

Self Cite

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“…The various processes employed in industry to mitigate the incidence of corrosion in aluminum alloys include those that use coatings formulated with Cr(VI) compounds which are extremely toxic and carcinogenic, and require an appropriate treatment prior to final waste disposal. Alternative processes for the aluminum's protection against corrosion have been considered aiming to replace the traditional chromate treatments, such as the silane-based pretreatments [2][3][4] , conversion coatings using inhibitors [5][6] and conductive polymers [7][8][9][10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole Film Doped with Corrosion-Inhibitors Electropolymerized on AA 1100

et al. 2019

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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 (E CORR) 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.

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Electrodeposition and characterization of polypyrrole films on T304 stainless steel

et al. 2022

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Polypyrrole Films Doped with Phosphomolybdate Anions on Al Surfaces – Formation and Corrosion Protection Characterisation

Cited by 4 publications

References 48 publications

Electrochemical Synthesis of Polypyrrole and Polypyrrole-Indomethacin Coatings on NiCr Alloys Involving Deep Eutectic Solvents

Electrochemical Synthesis of Polypyrrole and Polypyrrole-Indomethacin Coatings on NiCr Alloys Involving Deep Eutectic Solvents

Polypyrrole Film Doped with Corrosion-Inhibitors Electropolymerized on AA 1100

Electrodeposition and characterization of polypyrrole films on T304 stainless steel

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