Electrosynthesis of Polyaniline Film on AA 7075 Alloy and Its Corrosion Protection Ability

Polyaniline has been electrodeposited on an AA 7075 alloy by a potentiostatic method, and its corrosion protection ability has been studied by Tafel polarization and electrochemical impedance spectroscopic techniques in 1% NaCl. A pure polyaniline film protects the aluminum alloy up to 70%. However, the corrosion resistance property of the polyaniline film has substantially increased to 90% by post-treatment in a cerium salt solution. X-ray photoelectron spectra studies have shown that the film formed due to the post-treatment of polyaniline with the AA 7075 alloy in the cerium salt solution is composed of both Ce3+ and Ce4+ oxides

Synthesis of tungstate doped polyaniline and its usefulness in corrosion protective coatings

A study has been made on the corrosion protection performance of tungstate doped polyaniline containing vinyl coating on steel. The tungstate doped polyaniline was chemically synthesized and characterized by FTIR, XRD, UV-VIS and TGA studies. The corrosion protection performance of vinyl coating containing tungstate doped polyaniline on steel was assessed in 3% NaCl by electrochemical impedance studies (EIS). The coating has been found to offer protection more than 60 days in salt spray and immersion in 3% NaCl. FTIR studies have shown that the formation of iron–tungstate complex along with the passive film on stee

Soft template synthesis of poly(o-phenylenediamine) nanotubes and its application in self healing coatings

Poly(o-phenylenediamine) (PoPD) nanotubes were fabricated through chemical oxidative polymerization of o-phenylenediamine in cetyl trimethyl ammonium bromide (CTAB) microemulsion polymerization using �-cyclodextrin (�-CD). Iron (III) chloride (FeCl3) was used as a structure directing agent as well as an oxidant. The polymer nanotubes thus synthesized were characterized by FTIR, UV–vis, NMR and XPS techniques and the surface morphology of nanotubes was analyzed by using SEM and TEM. A study has been made on the corrosion protection performance of mild steel by epoxy coating containing synthesized PoPD nanotubes using EIS technique and OCP measurements

Electrosysnthesis of poly(aniline-co-m-amino benzoic acid) for corrosion protection of steel

Conducting polymer (poly(aniline-co-m-amino benzoic acid)) has been deposited on steel surface by cyclic voltammetric technique. The copolymer film was characterized by FTIR, XPS and SEM techniques. The corrosion protection performance of copolymer film on steel was found out by impedance and tafel polarization methods in 1N HCl. The copolymer film was found to be highly corrosion resistant

Sulphonate doped polyaniline containing coatings for corrosion protection of iron

Polyaniline containing organic coatings are found to protect steel in acid and in neutral media. Since dopants play an important role in the protection ability of polyaniline, a study has been made on the corrosion protection performance of sulphonate doped polyaniline containing vinyl coating in 0.1 N HCl and 3% NaCl by open circuit potential and impedance measurements. The open circuit potential measurements have shown that the coatings with polyaniline maintain the potential in the noble range whereas the coating without polyaniline exhibit potentials in the active range. EIS studies have shown that the sulphonate doped polyaniline is able to protect steel in acid and in neutral media since the impedance values of the coating remained at 1010 Ω cm2 even after 100 days exposure whereas the coatings without polyaniline have lost their protection ability after 50 days and 100 days in the acid and neutral media. FTIR studies have shown that PANI is able to protect by forming iron–PANI complexes beneath the coating along with a passive oxide layer

Electrosynthesis of polyaniline–molybdate coating on steel and its corrosion protection performance

Electrosynthesis of polyaniline–molybdate (PANI–MoO42−) on mild steel was achieved in oxalic acid medium using cyclic voltammetry technique. Adherent and homogeneous PANI–MoO4 2− coating was obtained. The corrosion behavior of steel with PANI–MoO4 2− coatings in 1% NaCl solutions was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The coating was characterized by SEM, XPS, EDAX and FTIR. The self-healing ability of PANI–MoO4 2− coating was confirmed by SVET technique. It has been found that the PANI–MoO42− coating is able to offer higher corrosion protection in comparison to that of pure PANI coating due to inhibitive nature of molybdate ion