Pitting corrosion protection of low nickel stainless steel by electropolymerized conducting polymer coating in 0·5 M NaCl solution

Abstract

Conducting polymers of polyaniline (PANi) and poly(o-phenylenediamine) (PoPD) were electropolymerized by cyclic voltammetric technique on low nickel stainless steel (LN SS) in H 2 SO 4 solution containing aniline and o-phenylenediamine monomers. The coatings were characterized by Fourier transform infrared spectroscopy, UV-visible and scanning electron microscopic techniques and the results are discussed. The corrosion protective properties of PANi and PoPD coatings on LN SS in 0·5 M NaCl were evaluated using potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) techniques. The potentiodynamic polarization and electrochemical impedance spectroscopic results indicate that the PoPD coating inhibits the corrosion of LN SS in 0·5 M NaCl solution more effectively than PANi.

Corrosion resistance of poly p-phenylenediamine conducting polymer coated 316L SS bipolar plates for Proton Exchange Membrane Fuel Cells

“…Many conductive polymers have been tried to face this situation. Among them, poly (o-phenylenediamine) [12][13][14][15][16], polyaniline [17][18][19] and polypyrrole [20] have already been investigated on stainless steel and aluminium alloys. The present investigation aims at coating 316L SS with poly (p-phenylenediamine) (PpPD) and to evaluate its …”

Hybrid Conducting Nanocomposites Coatings for Corrosion Protection

“…The corrosion protection of pure aniline is worse than the composite layer containing PANI and Clinoptilolite (see Table 3 -ref [100]). and EIS in 0.5M NaCl [96] PoPD acts as a better protective layer than PANI on steel against pitting corrosion.…”

Evaluation of synthesized polyaniline nanofibres as corrosion protection film coating on copper substrate by electrophoretic deposition

“…Figure 13 shows the schematic diagram demonstrating the mechanism of corrosion. These factors lead to better corrosion performance of the metals and in accordance to the intended functions [60][61][62][63][64][65][66].…”