Cyclic Voltammetric Synthesis of Poly(N-methyl pyrrole) on Copper and Effects of Polymerization Parameters on Corrosion Performance

Abstract

In the present work, we report the cyclic voltammetric synthesis of poly(N-methyl pyrrole) films onto copper surface from aqueous solutions of N-methyl pyrrole and oxalic acid. The effects of electropolymerization parameters (applied potential, scan rate, and cycle number) on the protective properties of poly(N-methyl pyrrole) films have been systematically investigated, and it was shown that protection efficiency strongly depends on the electrodeposition parameters. Nanoscale coatings electrodeposited at optimum electrochemical conditions were characterized by cyclic voltammetry, ex-situ attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) and scanning electron microscopy (SEM) studies. The performance of poly(N-methyl pyrrole) as protective coating against corrosion of copper in 0.1 M H2SO4 solution was assessed by electrochemical impedance spectroscopy (EIS) and anodic polarization techniques. Corrosion test results demonstrated that the poly(N-methyl pyrrole) coating has ability to protect the copper in acid rain corrosive media during 12 days and the protective behavior of the polymer film results from self-healing effect of the coating against the attack of the corrosive environment.

Interface modification in high voltage spinel lithium-ion battery by using N-methylpyrrole as an electrolyte additive

“…3a, at a scan rate of 0.1 mV s -1 , the two main peaks located around 4.7 V is attributed to two-step reversible oxidation/reduction of Ni 2+ /Ni 3+ and Ni 3+ /Ni 4+ redox couples, while the small one at 4 V is associated with the Mn 3+ /Mn 4+ redox couple. When additive was employed into the electrolyte, a small broad peak around 3.6 V appeared, indicating that the electrochemical polymerization of MPL occurs and contributes to the charge capacity [31,34]. Persuasive evidence for the polymerization of MPL can be obtained from the cyclic voltammogram of Li/Pt electrolytic cell assembled with pure MPL.…”

Electrochemical copolymerization of N-methylpyrrole and 2,2′-bithitiophene; characterization, micro-capacitor study, and equivalent circuit model evaluation

“…Polypyrrole (PPy) (Mollahosseini and Noroozian 2009;Basavaraja et al 2010;Chakraborty et al 2012;Duran and Bereket 2012) and its derivatives such as poly(Nmethylpyrrole) (P(N-MPy)) are conducting polymers due to their electrical properties and usable as protective coatings on oxidible metals (Asan et al 2005). N-MPy has advantages compared to pyrrole due to a methyl group, which can create a hydrophobic effect (Rajagopalan et al 2003).…”

Electrosynthesis of PAni/PPy coatings doped by phosphotungstate on mild steel and their corrosion resistances

“…As seen from the Nyquist plots and Table 2, both total impedance and R p of the corrosion process increase with immersion time in all cases of these double coatings. The increase in total impedance may be related to the auto-undoping properties of polymer in reduction processes [38,39]. It was reported that within the immersion of the conducting polymer-coated mild steel, the corrosion process could be described as follows:…”