Anticorrosive Properties of Poly(o‐phenylenediamine)/ZnO Nanocomposites Coated Stainless Steel

Abstract

Poly(o-phenylenediamine) and poly(o-phenylenediamine)/ZnO (PoPd/ZnO) nanocomposites coating were prepared on type-304 austenitic stainless steel (SS) using H2SO4acid as electrolyte by potentiostatic methods. Fourier transforms infrared spectroscopy and scanning electron microscopy techniques were used to characterize the composition and structure of PoPd/ZnO nanocomposites. The corrosion protection of polymer coatings ability was studied byEocp-time measurement, anodic and cathodic potentiodynamic polarization and impedance techniques in 3.5% NaCl as corrosive solution. It was found that ZnO nanoparticles improve the barrier and electrochemical anticorrosive properties of poly(o-phenylenediamine).

Investigation of Corrosion Resistance of poly(o-phenylenediamine)-ZnO Composites on Carbon Steel

“…The decrease in the corrosion current indicates that PZWC and PWC coatings can rely on the reversible redox properties of the polymer materials [32]. In the presence of ZnO nanocomposites, he corrosion resistance of the coating will also increase [33,34] anodic reaction by acting as a barrier layer between electrode surface and corrosive environment [24,35]. The protection efficiency (PE%) of coatings was also calculated by the following equation [36]:…”

“…To the best of our knowledge, few literature on the coating of PoPD-ZnO nanocomposites has been published as corrosion protection for carbon steel in chloride media [24]. In this paper, we used carbon steel as the substrate, and prepare nanocomposite coatings composed of PoPD and PoPD-ZnO by chemical oxidation.…”

Electrochemical Synthesis of Nanocomposites

“…Conductive polymer/ZnO nanocomposites coating were prepared on type-304 austenitic stainless steel (SS) using H 2 SO 4 acid as electrolyte by potentiostatic methods. It was found that ZnO nanoparticles improve the barrier and electrochemical anticorrosive properties of polymer [81]. Electrically conducting polypyrrole (PPy)-iron group (Ni, Co, Fe and their alloys) composite films have been electrodeposited at cathodic process to give ''tailored'' soft and hard magnetism.…”

Advanced anti corrosive properties of poly(aniline-co-o-toluidine)/flyash composite coatings

“…This is due to the presence of the poly(aniline-co-o-toluidine) in the coating system that accepts electrons from the metal and gives them to oxygen. This reaction assists the formation of a passive oxide layer at the polymer/metal interface, which lowers the corrosion rate and shifts the E corr to noble potential [33,34]. However, the corrosion resistance of specimen OPF4 was found to degrade severely in 3.5 wt.% NaCl solution (Table 2).…”

“…In the field of corrosion also, various works have been carried out to design PANI/inorganic filler composite coatings with good anti corrosive properties [18][19][20][21][22][23]. Among these inorganic fillers, flyash is an excellent reinforcing material for polymeric materials.…”