Characterization and anticorrosive properties of poly(2,3‐dimethylaniline)/nano‐Al₂O₃ composite synthesized by emulsion polymerization

Abstract

Poly(2,3-dimethylaniline)/nano-Al 2 O 3 composite (PAC) was synthesized by emulsion polymerization using dodecyl benzene sulfonic acid as emulsifier and dopant. The structure of PAC was characterized by Fourier fransformation infrared spectroscopy, UV-visible adsorption spectroscopy, and field emission scanning electron microscopy. The thermal stability was studied by thermogravimetric analysis, and the electrochemical performances were studied by cyclic voltammetry measurements. Epoxy coatings containing PAC and poly(2,3-dimethylaniline) (P(2,3-DMA)), respectively, were painted on steel, and accelerated immersion tests were performed to evaluate the anticorrosion property of the coatings in 3.5% NaCl solution. The results showed that the addition of PAC and P(2,3-DMA) could improve the anticorrosion performance of epoxy coating significantly and the PAC coating had higher corrosion resistance than that of P(2,3-DMA).

Fabrication of Poly(o/m-Toluidine)–SiC/Zinc Bilayer Coatings and Evaluation of Their Corrosion Resistances

“…It is well known that the ring substituted modification of PANI usually can improve the solubility, conductivity, thermal stability, and corrosion resistance of PANI derivatives [16]. Bilal et al [17] and our group [18] have confirmed the excellent structure and corrosion resistance of poly(o-toluidine).…”

“…These results indicate that the assembled outer polymer films can effectively protect the SiC/Zn surface and that the POT film is more protective. The improved corrosion protection ability of the composite coating is derived from the physical and electronic barrier effects of conducting polymers [12,16]. The poly(o/m-toluidine) was similar to PANI, exhibiting a redox potential close to silver, which could ennoble the available zinc surfaces and form one or more layers of passive oxide films on the surface of the SiC/Zn coating.…”

Polymer Nanocomposite‐based Coatings for Corrosion Protection

“…observed that the epoxy/polyamide coatings modified with 3.5 wt.% Al 2 O 3 nanoparticles showed optimal barrier properties, compact structure and resistance ability against hydrolytic degradation [118] . Rout, [119] Li [108b] and Babaei‐Sati et al. reported the similar role of Al 2 O 3 in the alumina/polymer nanocomposite coating with significant anticorrosive performance.…”

Polymer-Based Nanocomposite Coating Methods: A Review

“…Rout [123], Li [124], and Babaei-Sati et al all found that Al 2 O 3 plays a similar role in alumina/polymer nanocomposite coatings with strong anticorrosive properties. Because of their high chemical activity and surface energy, Al 2 O 3 has a limited potential as a reinforcement due to poor dispersion of the nanofillers and the tendency of NPs to coalesce [125][126][127]. Surface modification of Al 2 O 3 NPs, such as chemical surface functionalization using silane coupling agents and surfactant grafting, is a viable method for addressing this problem [128,129].…”