Application of the Kelvin Probe method for screening the interfacial reactivity of conducting polymer based coatings for corrosion protection

Rohwerder, Michael; Isik-Uppenkamp, Sonnur; Amarnath, Chellachamy Anbalagan

doi:10.1016/j.electacta.2010.09.098

Cited by 83 publications

(62 citation statements)

References 16 publications

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“…Nas últimas quatro décadas notou-se um aumentou significativo no estudo de polímeros intrinsecamente condutores (PIC) para serem utilizados em diversas aplicações tecnológicas, como por exemplo: em baterias recarregáveis, super-capacitores, dispositivos eletrônicos e eletrocrômicos, sensores, revestimentos anticorrosivos, blindagem eletromagnética, entre outras [1][2][3][4][5][6][7][8] . Dentre os vários polímeros condutores, o polipirrol (PPy) é um dos mais estudados e utilizados em aplicações comerciais, devido principalmente à sua elevada estabilidade química e ambiental, elevada condutividade elétrica e facilidade de síntese [9][10][11][12] .…”

Section: Introductionunclassified

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

et al. 2014

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Resumo: Nanocompósitos de montmorilonita/polipirrol (MMT/PPy) foram preparados a partir da polimerização in situ do pirrol na presença de argila, bentonita sódica natural, (MMT-Na + ) em solução aquosa com ou sem surfactante aniônico, dodecil sulfato de sódio (SDS), utilizando-se o cloreto de ferro (III) hexahidratado (FeCl 3 .6H 2 O), como oxidante. A estrutura e propriedades dos nanocompósitos obtidos pela polimerização in situ do pirrol na presença de SDS (MMT/PPy.SDS) e sem surfactante (MMT/PPy) foram avaliadas e comparadas a partir da espectroscopia de infravermelho com transformada de Fourier (FTIR), difração de raios X (DRX), microscopia eletrônica de varredura (MEV), microscopia eletrônica de transmissão (MET), análise termogravimétrica (TG) e método padrão quatro pontas. Os difratogramas dos nanocompósitos revelaram que o espaçamento basal d 001 da MMT (1,42 nm) foi alterado para valores maiores, indicando a intercalação do PPy na MMT para ambos os nanocompósitos obtidos. Os difratogramas e as imagens de MET e MEV dos nanocompósitos de MMT/PPy.SDS confirmaram que a presença do SDS na reação promoveu, além da intercalação, esfoliação parcial da argila. Os nanocompósitos MMT/PPy.SDS apresentaram condutividade elétrica (9,50 S/cm) maior do que o nanocompósito de MMT/PPy (4,44 S/cm). A presença da argila melhorou de forma significativa a estabilidade térmica do PPy. Palavras-chave: Polipirrol, montmorilonita, nanocompósitos, condutividade elétrica. The Preparation of Montmorillonite/polypyrrole Nanocomposites: The Effect of Surfactant Incorporation on the Structure and PropertiesAbstract: Montmorillonite/polypyrrole (MMT/PPy) nanocomposites were prepared by the in situ polymerization of pyrrole in the presence of clay, natural sodium bentonite, (MMT-Na + ) in aqueous solutions with or without an anionic surfactant, sodium dodecyl sulfate (SDS), using Iron (III) chloride hexahydrate (FeCl 3 .6H 2 O) as oxidant. The structure and properties of the nanocomposites obtained by the in situ polymerization of pyrrole in the presence of SDS (MMT/PPy.SDS) and without surfactant (MMT/PPy) were compared and evaluated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis and the four-point probe method. The XRD patterns of the MMT/PPy composites shows that the d 001 spacing in MMT (1.42 nm) was changed to higher values, indicating the intercalation of PPy on MMT for both nanocomposites. The XRD pattern, SEM and TEM images of the MMT/PPy.SDS nanocomposites confirmed that the presence of SDS in the reaction medium promoted, beyond intercalation, the partial exfoliation of the clay. The MMT/PPy.SDS nanocomposites showed electrical conductivity (9.50 S/cm) higher than the MMT/PPy nanocomposites (4.44 S/cm). The presence of the clay significantly improved the thermal stability of PPy.

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Section: Introductionunclassified

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

et al. 2014

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“…The toxicity and environmental concerns of technologies based on Cr-derived systems have prompted material scientists to come up with more environmentally friendly solutions, including conversion films based on rareearth metals [1,2], sol-gel technologies [3][4][5], conducting polymers [6,7] and layered double hydroxides (LDHs) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of AA2024-T3 by LDH conversion films. Analysis of SVET results

Tedim

Bastos

Kallip

et al. 2016

Electrochimica Acta

100

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In this work the protective effect of layered double hydroxide (LDH) films directly grown on the surface of 2024-T3 aluminium alloy is investigated using electrochemical impedance spectroscopy (EIS) and the scanning vibrating electrode technique (SVET).The SVET results focused on the localised nature of the corrosion process and are in agreement with the global response measured by EIS. Furthermore, the evolution of active corrosion protection rendered by LDH films is surveyed at microscale for the first time for long immersion periods in NaCl solution and in the presence of induced defects. The quantitative information provided by SVET is discussed and a parameter to describe the degree of corrosion localisation is introduced based on LDH systems.

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“…Williams et al [18,19] and Nazarov and Thierry [20] also observed very low potentials when the coatings based on CPs were used on zinc, which can be explained by Fermi-level misalignment [17,21]. Consequently the CP is incapable of sensing the potential decrease occurring when the metal changes from passivity to active corrosion [15,17,21,22]. This may lead to an improved corrosion protection on zinc [23], but only by a passive and not by an active function as targeted here.…”

Section: Introductionmentioning

confidence: 71%

“…Another problem is that CPs applied on zinc lead to the formation of an insulating layer at CP/metal interface resulting in electronically decoupling (Fermi-level misalignment) between the CP and the metal, leading to a seemingly too low potential. Williams et al [18,19] and Nazarov and Thierry [20] also observed very low potentials when the coatings based on CPs were used on zinc, which can be explained by Fermi-level misalignment [17,21]. Consequently the CP is incapable of sensing the potential decrease occurring when the metal changes from passivity to active corrosion [15,17,21,22].…”

Section: Introductionmentioning

confidence: 87%

Novel conducting polymer based composite coatings for corrosion protection of zinc

Bai

Tran

et al. 2015

Corrosion Science

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Application of the Kelvin Probe method for screening the interfacial reactivity of conducting polymer based coatings for corrosion protection

Cited by 83 publications

References 16 publications

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

Obtenção de nanocompósitos condutores de montmorilonita/polipirrol: Efeito da incorporação do surfactante na estrutura e propriedades

Corrosion protection of AA2024-T3 by LDH conversion films. Analysis of SVET results

Novel conducting polymer based composite coatings for corrosion protection of zinc

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