Graphene oxide-modified polyaniline pigment for epoxy based anti-corrosion coatings

Mooss, Vandana A.; Bhopale, Abhijit A.; Deshpande, Pravin P.; Athawale, Anjali A.

doi:10.1007/s11696-017-0146-3

Cited by 33 publications

(15 citation statements)

References 44 publications

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“…To further investigate the corrosion protection behavior of ER composites coating, RGO‐IL (RGO to IL with a weight ratio of 1 : 4) was selected to compare with other ER samples. Figure showed the Bode and Nyquist plots of the bare Q235, ER, IL/ER, RGO/ER, and RGO‐IL/ER coatings immersed in 3.5 wt % NaCl solution for 1 h. As shown in Figure A), for the bare Q235, there was a time constant in Nyquist plot, which of time constant should be associated to the passive film surface and steel surface respectively . The impedance modulus (Z′) approximated 123 Ω cm 2 .…”

Section: Resultsmentioning

confidence: 93%

“…Figure 5 showed the Bode and Nyquist plots of the bare Q235, ER, IL/ER, RGO/ER, and RGO-IL/ER coatings immersed in 3.5 wt % NaCl solution for 1 h. As shown in Figure 5 A), for the bare Q235, there was a time constant in Nyquist plot, which of time constant should be associated to the passive film surface and steel surface respectively. [41] The impedance modulus (Z') approximated 123 W cm 2 . The Bode magnitude plots (Log j Z j vs Log (Freq/Hz)) of the samples after 1 h of immersion were displayed in Figure 5 B).…”

Section: The Eis Measurements For Various Coatingsmentioning

confidence: 99%

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Enhancing the Corrosion Resistance of Epoxy Coatings by Impregnation with a Reduced Graphene Oxide‐Hydrophobic Ionic Liquid Composite

Wang

Zhang

et al. 2018

ChemElectroChem

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Conventional epoxy resin fails as corrosion protection in long‐term soaking in water as pores are developing. Here, a modified epoxy coating with enhanced corrosion resistance was fabricated by impregnation with functionalized reduced graphene oxide‐hydrophobic ionic liquid (RGO‐IL) nano composites. The modified RGO was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT‐IR), electrochemical impedance spectroscopy and simulated immersion experiments. Compared to epoxy resin (ER) coatings without RGO‐IL nano composites, the ER with RGO nano composites showed higher hydrophobicity in contact angle tests. In electrochemical experiments on Q235 substrates coated with the RGO‐IL/ER composite, enhanced barrier properties and excellent corrosion protection was found. A more hydrophobic interface was built, and the nano composite material of RGO‐IL was easy to prepare and cost efficient. We speculated that the presence of the ionic liquids also improves the dispersion properties of RGO in ER, and thereby further improving its barrier effect. In addition, the hydrophobic ionic liquid itself had a hindrance to water molecules and chloride ions. The highlight of our work is the combination of the corrosion inhibition of the hydrophobic ionic liquids with the barrier effect of RGO.

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Section: Resultsmentioning

confidence: 93%

Section: The Eis Measurements For Various Coatingsmentioning

confidence: 99%

Enhancing the Corrosion Resistance of Epoxy Coatings by Impregnation with a Reduced Graphene Oxide‐Hydrophobic Ionic Liquid Composite

Wang

Zhang

et al. 2018

ChemElectroChem

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“…2 GO-based coatings and nanocomposite matrices, with high corrosion-prevention efficiency, even in saline waters, have also been developed. [5][6][7][8] In addition, several laboratory-scale studies have shown that GO is effective for water treatment. 9 The fate of GO has been extensively studied in synthetic media such as pure water with or without salts, [10][11][12] and less so in waters collected from natural freshwater sources including wastewater effluent, 11 rivers, 10,11 and lakes.…”

Section: Introductionmentioning

confidence: 99%

Fate and Transformation of Graphene Oxide in Estuarine and Marine Waters

Adeleye

Zhang

et al. 2019

Environ. Sci. Technol.

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The possibility of graphene oxide (GO) exposure to the environment has spurred several studies investigating the fate of this nanoparticle (NP). However, there is currently little or no data on the fate of GO in estuarine and marine waters. This study investigated the aggregation, sedimentation and transformation of GO in saline waters, considering the role of salinity (0-50 ‰), light (visible light and solar irradiation), aging, among others. The attachment efficiency of GO reached unity at 1.33 ‰. The sedimentation rate of GO increased with salinity up to 10 ‰ after which it decreased due to formation of ramified GO agglomerates and media density. Based on the sedimentation rate determined at 30 ‰ (0.121 m/d), the residence time of GO agglomerates in the euphotic zone of typical open oceans will exceed 500 days. Aging in the presence of visible light increased the relative abundance of the GO's aromatic (C−C/C=C) fraction, reducing the NP. Reduction of GO in visible light was confirmed via UV-Vis and Raman spectroscopic techniques. Reduction of GO was faster under solar irradiation. This study demonstrates that when introduced into saline waters GO will undergo a range of transformations affecting its fate and potential effects to aquatic organisms.

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“…[8][9][10] A widely used method for preparing graphene/PANI is the use of graphene oxide (GO), combining GO with PANI using covalent bonds, which may cause damage to the conjugate structure of the GO sheets. Furthermore, GO was prepared via a modified Hummer's method, [11][12][13][14][15][16][17] which involves the use of strong oxidizing agent. Thus, it is of great importance to develop an environmentally friendly method to prepare graphene.…”

Section: Introductionmentioning

confidence: 99%

Preparation of graphene/polyaniline nanocomposite by in situ intercalation polymerization and their application in anti-corrosion coatings

Wang

et al. 2019

High Performance Polymers

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This study reports a strategy for further simplifying the synthesis process of polyaniline-modified graphene (An/G) nanocomposite. For this purpose, the An/G nanocomposite was prepared by expanded graphite (EG) and aniline (An) via in situ polymerization. The structures and morphologies of the An/G nanocomposite were examined by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, ultraviolet–visible spectroscopy and atomic force microscopy. The results show that the An/G nanocomposite was synthesized successfully. The coatings were prepared using polyaniline (PANI) and An/G as the fillers and epoxy resin as the matrix. The anti-corrosion performance was evaluated by electrochemical impedance spectroscopy, Tafel polarization curve and salt immersion test. When An/G100 nanocomposite with a mass ratio of An to EG of 100:1 as a filler is used, the coating on the steel exhibited superior anti-corrosion effect. In particular, the impedance at 0.01 Hz of the coating with the An/G100 nanocomposite at a low loading of 2 wt% (An/G100-2) remained constant above 1 × 1010 Ω·cm2 for up to 35 days in 3.5 wt% sodium chloride solution. The Tafel plots reveal that the undamaged zone of the An/G100-2 coating possessed a high corrosion potential of −0.16 V, and the corrosion current density was only 1.5 × 10−11 A cm−2. The protective mechanism of graphene and PANI is discussed.

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Graphene oxide-modified polyaniline pigment for epoxy based anti-corrosion coatings

Cited by 33 publications

References 44 publications

Enhancing the Corrosion Resistance of Epoxy Coatings by Impregnation with a Reduced Graphene Oxide‐Hydrophobic Ionic Liquid Composite

Enhancing the Corrosion Resistance of Epoxy Coatings by Impregnation with a Reduced Graphene Oxide‐Hydrophobic Ionic Liquid Composite

Fate and Transformation of Graphene Oxide in Estuarine and Marine Waters

Preparation of graphene/polyaniline nanocomposite by in situ intercalation polymerization and their application in anti-corrosion coatings

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