Effect of polyaniline–montmorillonite nanocomposite powders addition on corrosion performance of epoxy coatings on Al 5000

Hosseini, Mir Ghasem; Jafari, Moharram; Najjar, Reza

doi:10.1016/j.surfcoat.2011.07.012

Cited by 107 publications

(53 citation statements)

References 24 publications

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“…However, the weakening of the barrier property of the coating as a result of the commencement of electrolyte diffusion can be correlated with the above observation. The chloride ions present in NaCl solution makes it even more aggressive and the hydrogen bonds between the metal surface and the epoxy resin are replaced by the chloride ions and water molecules, resulting in the enhanced corrosion rate …”

Section: Resultsmentioning

confidence: 99%

Conducting polymer/bio‐material composite coatings for corrosion protection

Sambyal¹,

Ruhi

Mishra

et al. 2017

Materials & Corrosion

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Present study demonstrates a facile in situ oxidative copolymerization method to synthesize conducting copolymer composites in aqueous chitosan medium. The development of poly(aniline‐co‐o‐toluidine)–chitosan–SiO2/epoxy composite coatings were carried out by thermal curing of the spray‐coated mild steel substrates. FT‐IR analysis, XRD studies, SEM and HR‐TEM evidenced that the composite has synergistically integrated properties of the copolymer and the SiO2 nanoparticles. The electrochemical analyses of the coatings in 3.5% NaCl solution manifest an efficient role of copolymer composite in the remarkable improvement of the corrosion resistance of the substrate. The analyses involve Tafel polarization and electrochemical impedance spectroscopy (EIS) studies. The corrosion inhibition property of conducting copolymers, the film forming ability of chitosan, and robustness of SiO2 nanoparticles kept the corrosion rate of the coatings significantly low, under highly corrosive conditions. Mild steel coated with 3.0% loading of copolymer composite coating demonstrated very low corrosion current density (icorr) and significantly high pore resistance (Rpore).

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Section: Resultsmentioning

confidence: 99%

Conducting polymer/bio‐material composite coatings for corrosion protection

Sambyal¹,

Ruhi

Mishra

et al. 2017

Materials & Corrosion

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“…The broad low intensity peak at 2θ = 6.7° is related to the ordered PAni structure. Although emeraldine‐base PAni is an amorphous polymer, some researchers have obtained a semi‐crystalline PAni when synthesized in the presence of silicate layers. In fact, the in‐situ polymerization of aniline inside the gallery space between clay platelets and the interactions of synthesized PAni macromolecules with silicate layers force the PAni chains to be oriented along the silicate layer surfaces which results in an ordered PAni microstructure.…”

Section: Resultsmentioning

confidence: 99%

Matrimid-polyaniline/clay mixed-matrix membranes with plasticization resistance for separation of CO₂from natural gas

Samadi

Navarchian

2016

Polym. Adv. Technol.

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Mixed‐matrix membranes (MMMs) of Matrimid® and polyaniline/clay (PC) are investigated for CO2/CH4 separation and CO2‐induced plasticization. PC particles are synthesized through in‐situ polymerization of aniline in the presence of organophilic clay and then incorporated into Matrimid by solution casting method. Chemical structure and morphology of PC powder and fabricated membranes are analyzed by Fourier transform infrared (FTIR), X‐ray diffraction (XRD), differential scanning calorimetry/thermogravimetric analysis (DSC/TGA) and scanning electron microscopy (SEM). The XRD spectra of PC particles show the exfoliation of silicate layers throughout the polyaniline (PAni) matrix, and SEM images indicate flower‐petal morphology for PC particles. The permeability values of CO2 and CH4 increase 30–35% by incorporation of 10 wt% PC without any significant drop in selectivity. PC particles with flower‐petal morphology plays an important role in increasing the gas permeability values of both gases while Matrimid is the only phase that controls CO2/CH4 selectivity. The plasticization pressure was increased to 30 bar by incorporation of 10 wt% PC in the Matrimid matrix. CO2 permeability and pplast improved 35% and 200%, respectively, resulting in 300% enhancement in the capacity of MMM in the purification of natural gas with a selectivity of about 40. Copyright © 2016 John Wiley & Sons, Ltd.

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“…have been synthesized and utilized for the corrosion protection of metals and metal alloys. [52][53][54][55][56] The functional properties and specific morphology of these materials exercise an additional protection mechanism. For example, the platelet nature of flakes can result in the lengthening of the path for corrosive ions.…”

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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Effect of polyaniline–montmorillonite nanocomposite powders addition on corrosion performance of epoxy coatings on Al 5000

Cited by 107 publications

References 24 publications

Conducting polymer/bio‐material composite coatings for corrosion protection

Conducting polymer/bio‐material composite coatings for corrosion protection

Matrimid-polyaniline/clay mixed-matrix membranes with plasticization resistance for separation of CO₂from natural gas

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

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Effect of polyaniline–montmorillonite nanocomposite powders addition on corrosion performance of epoxy coatings on Al 5000

Cited by 107 publications

References 24 publications

Conducting polymer/bio‐material composite coatings for corrosion protection

Conducting polymer/bio‐material composite coatings for corrosion protection

Matrimid-polyaniline/clay mixed-matrix membranes with plasticization resistance for separation of CO2from natural gas

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

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Matrimid-polyaniline/clay mixed-matrix membranes with plasticization resistance for separation of CO₂from natural gas