Hexagonal Boron Nitride/Polyaniline Nanocomposites for Anticorrosive Waterborne Epoxy Coatings

Abstract

The hexagonal boron nitride (h-BN) nanosheets have been used as nanofillers to improve the barrier properties of the waterborne epoxy (WEP) coatings. However, the h-BN nanosheets tend to agglomerate, which limits their anticorrosion applications. In this paper, the h-BN/polyaniline (h-BN/PANI) nanocomposites were prepared by the in situ polymerization of aniline on the surfaces of the h-BN nanosheets, which were further used to improve the anticorrosion performance of the WEP coatings. The structures of the as-prepared h-BN/PANI nanocomposites were investigated by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The anticorrosion performances of the coatings were evaluated by electrochemical impedance spectroscopy. After immersion in 3.5 wt % NaCl solution for 28 days, the macro-morphologies and elemental changes of the substrate surfaces were analyzed by a 3D digital microscope and an energy-dispersive spectroscope, respectively. The results showed that the WEP coatings with the h-BN/PANI nanocomposites, especially that with 2 wt % h-BN/PANI nanocomposites, exhibited remarkably reinforced anticorrosion performance compared to the pure WEP coating. For the WEP coating, the coating with 1 wt % PANI, and the coating with 1 wt % h-BN, the substrates have been completely corroded. However, there was no obvious corrosion region for the coating containing 2 wt % h-BN/PANI nanocomposites. The superior anticorrosion performance of the coatings with h-BN/PANI nanocomposites was mainly attributed to the synergistic effect of the well-dispersed h-BN/PANI nanocomposites as the physical barrier and PANI as the corrosion inhibitor in this system.

Corrosion Behavior of 1D and 2D Polymorphs of Boron Nitride Ceramic

“…Yi et al, in their study on size-selected BNNS coating on a polymer, concluded that larger BNNS (∼21.4 μm 2 ) greatly enhanced the corrosion resistance of the polymer. Hexagonal BN’s proactive anticorrosive property is directly correlated with its surface morphology and area. − …”

“…Bulk, free-standing 1D boron nanotubes (BNNTs) fabricated as 100% BNNT and oriented randomly in-plane are commercially available as BNNT buckypaper (BP). − They are analogous to carbon nanotubes but offer multifunctional advantages, including piezoelectricity, electrical insulation, high-temperature stability, and neutron absorption. , Compared to 2D hBN nanoplatelet (BNNP), 1D BNNT is arranged randomly into a porous 3D structure and offers a substantially greater surface area. Previous research studies − concluded that hBN with a high surface area offers increased corrosion resistance due to higher interfacing with the underlying material. Yet, BNNTs are not recognized as corrosion-inhibiting additives.…”

“…Initial studies report corrosion-inhibiting properties of hBN when BN particles are directly coated on metal substrates or as additives with polymers. − However, a few studies concluded that thick nanolaminate BN particles increase the corrosion rate of composite materials . Liu et al confirmed that the ultrathin-grown BN’s effectiveness on Ni acted as an effective oxidation-resistant coating in an aggressive atmosphere up to 1100 °C .…”

Superior conductive polypyrrole anti‐corrosion coating doped with titanium nitride for 304 stainless steel bipolar plates

“…The conductive polymer (CP) coatings, including polyaniline (PANI), polypyrrole (PPy), and polythiophene (PTH), are potential candidates for protecting metallic bipolar plates from corrosion and reducing resistance due to their good corrosion resistance, high stability, simple synthetic process, and other characteristics 7–10 . However, the limitations of CP coating, including its anion‐exchange properties, porous structure, and irreversible depletion of the charge stored in it, still need to be solved 11 .…”

Электронная Спектроскопия Графена, Полученного Методом Ультразвукового Диспергирования

“…Опубликованы работы по использованию его композитов в качестве материала для коррозионной защиты. Описано использование композитов на основе графена и полимера Nafion [5], на основе графена, нитрида бора и полианилина [6]. Графен также находит применение в качестве носителя катализатора в системах электрохимического преобразования энергии [7,8].…”