Conducting poly(o-anisidine-co-o-phenyldiammine) nanorod dispersed epoxy composite coatings: synthesis, characterization and corrosion protective performance

Abstract

Conducing polymers (CPs) have been significantly contributing to the development of high performance new-generation anti-corrosive coatings. CPs nanofiller dispersed insulating polymer coating effectively prevents the transport of corrosive ions (H + , O 2-, Cl -, OHetc) at coating-metal interface, via barrier or redox mechanism. In view of this, for the first time, we report the synthesis of poly (o-anisidine-co-o-phenyldiammine) P(oA-co-oPDA) copolymer conducting nanorods. Poly (o-anisidine) (PoA) conducting nanoparticles were also synthesized laterally. The formulation of these nanofillers dispersed epoxy-polyamide (PA) nanocomposite coating systems have also been reported. The structural elucidation was performed by FT-IR, UV-Vis, 1 H NMR spectroscopy. The crystallnity, surface area and morphology of fillers were analysed by XRD, BET, SEM and TEM techniques. The thermal stability and hydrophobic behaviour were investigated using TGA, DSC and contact angle measurements. The physicomechanical properties and corrosion protective performance of these coatings were evaluated using standard methods. The salt spray test, potentiodynamic polarization (PDP) and electron impedance spectroscopy studies (EIS) were conducted in 5 wt % NaCl and 5 wt % HCl media.3 revealed that the P(oA-co-oPDA)-epoxy-PA nanocomposite coating have exhibited superior performance than those of PoA-epoxy-PA, epoxy-PA and other such nanocomposite coatings.

Promoting the effect of zinc‐rich epoxy via poly(aniline‐co‐anisidine)/iron waste composite on corrosion protection of steel

“…Figure presents the FTIR spectra of the copolymer, IWP, and COIW. The FTIR spectrum of the copolymer (Figure A) shows the characteristic bands of the poly(aniline‐ co ‐anisidine) . The N─H and C═N stretching vibrations appeared at 3403 and 1622 cm −1 , respectively.…”

“…Figure 1A) shows the characteristic bands of the poly(aniline-coanisidine). [25][26][27] The N─H and C═N stretching vibrations appeared at 3403 and 1622 cm −1 , respectively. C═C stretching bands for the quinonoid rings observed at 1564 cm −1 and those for benzenoid groups emerged at 1506 and 1457 cm −1 .…”

Reduced Graphene Oxide Reinforced Waterborne Soy Alkyd Nanocomposites: Formulation, Characterization, and Corrosion Inhibition Analysis

“…This indicates that the protection performance of the WSA-PMF-80 gets reduced after the continuous immersion of 48 h. However, a negligible increase in fb was recorded at high frequency range after 216 h. This further implies that the nanocomposite coatings show no delamination under saline medium even after a longer exposure time . These studies revealed that the proposed nanocomposite coatings possess reasonably higher corrosion potential ( E corr = −0.191 V) and impedance values ( Z = 10 7 Ohm cm 2 ) than the other oleo polymer composites ( E corr = −0.533 to 0.314 V and Z = 10 3 to 10 5 Ohm cm 2 ) and these values are comparable to some of the commercial epoxy and polyurethane ( Z = 10 7 Ohm cm 2 ) coatings. , …”

“…67 These studies revealed that the proposed nanocomposite coatings possess reasonably higher corrosion potential (E corr = −0.191 V) and impedance values (Z = 10 7 Ohm cm 2 ) than the other oleo polymer composites (E corr = −0.533 to 0.314 V and Z = 10 3 to 10 5 Ohm cm 2 ) and these values are comparable to some of the commercial epoxy and polyurethane (Z = 10 7 Ohm cm 2 ) coatings. 24,68 Salt Spray Test. The salt spray test was performed in 5.0 wt % NaCl solution under 90% humid environment for 360 h (Figure S6) to analyze the corrosion protection efficiency of WSA-PMF-80 and WSA-PMF-80-RGO-x nanocomposite coatings.…”

Poly(o‐anisidine), its composites, derivatives and applications: A review

“…Nanocomposite coatings have demonstrated improved physico‐mechanical characteristics and even distribution of nanostructures within the epoxy matrix. It exhibited outstanding corrosion resistance properties as compare to other coatings 119 …”