Anticorrosive behavior of a zinc-rich epoxy coating containing sulfonated polyaniline in 3.5% NaCl solution

Abstract

An epoxy zinc-rich composite coating containing self-doped conducting sulfonated polyaniline (SPANi) nanofiber was prepared and the corrosion resistance of as-prepared coatings on Q235 substrate studied by open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and scanning vibrating electrode technique (SVET). Results suggested that a zinc-rich coating with addition of 1.0 wt% SPANi could enhance the cathodic protection time and barrier performance. To study corrosion diffusion, artificial scratch and adhesion strength were investigated via the salt spray test and pull-off test, respectively. Finally, the passivating action of coatings was demonstrated by analyses of corrosion products via X-ray diffraction spectroscopy.

Experimental and DFT studies of porous carbon covalently functionalized by polyaniline as a corrosion inhibition barrier on nickel-based alloys in acidic media

“…The polyaniline benzenoid diamines, quinoid diamine, pyridine, and tertiary nitrogen non-bonding electrons lead to the chemisorption on the alloy surface. 56,57 Hence, the polyaniline fragment DE 1.0445 eV values are decreased and electrostatic potential 9743.6185 a.u values is increased indicates that polyaniline adsorbed on nickel alloy surface. In addition, positive charge of polyaniline nitrogen atom can improve the physisorption on the alloy surface to control the hydrogen evolution.…”

Electrochemical Obtaining and Corrosion Behavior of Zinc-Polyaniline (Zn-PANI) Hybrid Coatings

“…Some studies suggest that PANI can release anions when the coating is damaged which leads to a second physical barrier that impedes the penetration of the aggressive agents. This mechanism is clearly illustrated by Wessling [30][31][32], Schauer et al [33], Sathiyanarayanan et al [34], and Nguyen et al [35]. Some other suggestions about the corrosion protection improvement of Zn-based functional layers have been elaborated in [36].…”

Corrosion Resistance Synergistic Appraisal of Titanium-Impregnated Bisphenol A-Type Epoxy Duplex Coating System in Stimulated and Natural Marine Environments of Southeastern Coastal Area of China–Pakistan Economic Corridor

“…Malshe and Waghoo have proposed that gloss reduction in the epoxy coating may be due to the degradation of the aromatic matrix and secondary hydroxyl groups [48]. Yang and his coworkers have reported that the marine environment has caused a higher reduction in the gloss of the applied coating as compared to the salt spray testing due to sunlight and harsh atmospheric pollutants [49]. Bano and coworkers have also observed that in the epoxy coating, maximum gloss reduction was after natural exposure testing compared to salt spray testing [43].…”