Recent advances of polyaniline composites in anticorrosive coatings: A review

Gao, Fangjian; Mu, Jie; Bi, Zhenxiao; Wang, Shun; Li, Zili

doi:10.1016/j.porgcoat.2020.106071

“…Hence, 11 from the view point of electrochemical analyses, PANI can remarkably improve the anticorrosive performance of waterborne epoxy coating. suppressed penetration of corrosive media by reducing the porosity to form more compact coating; and 5) electric field effect by the contact between metal and PANI to hinder the migration of electrons from metal to oxidant [35]. In this study, an ultrasonic blending method was adopted to realize the uniform dispersion of PANI particles in WEP matrix.…”

Section: Characterizations Of Pani/wep Coatingsmentioning

confidence: 99%

Improved anticorrosive property of waterborne epoxy coating by ultrasonic blending with small amounts of polyaniline

Xu

¹

,

Zhang

²

,

Wang

³

et al. 2022

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In order to improve the anticorrosive performance of waterborne epoxy (WEP) coating, small amounts of polyaniline (PANI) were blended under ultrasonic irradiation to obtain PANI/WEP composite coatings with high dispersibility of PANI particles. The PANI/WEP composite coatings were characterized by Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). Their adhesive force level and hardness grade were tested based on the Chinese National Standard GB/T9286-1998 and GB/T6739-1996, respectively. These results indicated that, compared to the pristine WEP coating, the addition of PANI with suitable content could completely fill the micropores or microcracks and remarkably improve the hardness grade of composite coatings. The electrochemical impedance spectra (EIS) and Tafel polarization curves revealed that the addition of PANI not only could increase the impedance arc, but also could increase the impedance modulus at low frequency. Then, the salt spray tests were employed to observe the anticorrosive performance of PANI/WEP composite coatings. Finally, the enhanced anticorrosive mechanism of WEP coating by the addition of small amounts of PANI was proposed and discussed. The addition of PANI with suitable content could play an important role of physical and chemical barriers to improve the anticorrosive performance of waterborne epoxy coating.

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“…However, researchers still could not reach a consensus on the enhanced anticorrosive mechanism by PANI, attributed to the complicated affecting factors such as dosage, doping, modification and redox state of PANI. Up to now, five widely accepted anticorrosive mechanisms are suggested as follows: 1) anode protection by the oxidation of PANI to form a new product layer on the metallic surface; 2) cathode separation by transferring the electrons generated by the corrosive reactions at the coating-metal interface to the interior of coating; 3) release of corrosion inhibitors by the doping of PANI with suitable inhibitors; 4) suppressed penetration of corrosive media by reducing the porosity to form more compact coating; and 5) electric field effect by the contact between metal and PANI to hinder the migration of electrons from metal to oxidant [35]. In this study, an ultrasonic blending method was adopted to realize the uniform dispersion of PANI particles in WEP matrix.…”

Section: Enhanced Anticorrosive Mechanism Of Pani/wep Coatingsmentioning

confidence: 99%

Improved anticorrosive property of waterborne epoxy coating by ultrasonic blending with small amounts of polyaniline

Huanyan

¹

,

Zhang

²

,

Wang

³

et al. 2021

Preprint

1

0

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In order to improve the anticorrosive performance of waterborne epoxy (WEP) coating, small amounts of polyaniline (PANI) were blended under ultrasonic irradiation to obtain PANI/WEP composite coatings with high dispersibility of PANI particles. The PANI/WEP composite coatings were characterized by Fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). Their adhesive force level and hardness grade were tested based on the Chinese National Standard GB/T9286-1998 and GB/T6739-1996, respectively. These results indicated that, compared to the pristine WEP coating, the addition of PANI with suitable content could completely fill the micropores or microcracks and remarkably improve the hardness grade of composite coatings. The electrochemical impedance spectra (EIS) and Tafel polarization curves revealed that the addition of PANI not only could increase the impedance arc, but also could increase the impedance modulus at low frequency. Then, the salt spray tests were employed to observe the anticorrosive performance of PANI/WEP composite coatings. Finally, the enhanced anticorrosive mechanism of WEP coating by the addition of small amounts of PANI was proposed and discussed. The addition of PANI with suitable content could play an important role of physical and chemical barriers to improve the anticorrosive performance of waterborne epoxy coating.

show abstract

“…Polyaniline (PANI) is an important member of the intrinsically conductive polymer (ICP) family. Since PANI is easy to synthesize and exhibits a wide range of conductivity, low operational voltage, unique electrochemical properties, and environmental stability, numerous researchers have studied it extensively [ 2 , 3 , 4 , 5 , 6 ] and have used it in many applications, such as secondary batteries [ 7 , 8 ], biosensors [ 9 , 10 ], corrosion protectors [ 11 , 12 ], antistatic packaging materials [ 13 ], and light-emitting diodes (LEDs) [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of γ-Al2O3 Nanoparticles Using Conductive Polyaniline Doped by Dodecylbenzene Sulfonic Acid

Chen

¹

,

Lin

²

,

Lin

³

2022

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In this study, electrically conductive PANDB/γ-Al2O3 core–shell nanocomposites were synthesized by surface modification of γ-Al2O3 nanoparticles using polyaniline doped with dodecylbenzene sulfonic acid. The PANDB/γ-Al2O3 core–shell nanocomposites were synthesized by in situ polymerization. Pure PANDB and the PANDB/γ-Al2O3 core–shell nanocomposites were characterized using Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, transmission electron microscopy, field emission scanning electron microscopy, and measurement of a four-point probe. The conductivity of the PANDB/γ-Al2O3 core–shell nanocomposite was about 0.72 S/cm when the weight ratio of aniline/γ-Al2O3 was 3/1. The results showed that the conductivity of the PANDB/γ-Al2O3 core–shell nanocomposite decreased with increasing amounts of γ-Al2O3 nanoparticles. The transmission electron microscopy results indicated that the γ-Al2O3 nanoparticles were thoroughly coated with PANDB to form a core–shell structure. Transmission electron microscopy and field emission scanning electron microscopy images of the conductive PANDB/γ-Al2O3 core–shell nanocomposites also showed that the thickness of the PANDB layer decreased as the amount of γ-Al2O3 was increased.

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Recent advances of polyaniline composites in anticorrosive coatings: A review

Cited by 98 publications

References 195 publications

Improved anticorrosive property of waterborne epoxy coating by ultrasonic blending with small amounts of polyaniline

Improved anticorrosive property of waterborne epoxy coating by ultrasonic blending with small amounts of polyaniline

Improved anticorrosive property of waterborne epoxy coating by ultrasonic blending with small amounts of polyaniline

Surface Modification of γ-Al2O3 Nanoparticles Using Conductive Polyaniline Doped by Dodecylbenzene Sulfonic Acid

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