Composite conducting polymer coatings on mild steel electrode and corrosion protection

Abstract

Multilayered polypyrrole/polyaniline (PPy/PANI) and PANI/PPy coatings were deposited by 30 successive scan between -600 and 1500 mV on mild steel electrode. Electrochemical impedance spectroscopy was used to clarify the ability of these composites to provide an effective barrier to corrosion in 0.1 M NaCl solution. For long exposure time, the performance of composite coatings on steel was not sufficiently better than for single PANI or for single PPy coating. EIS measurements show that the degree of protection is a function of the deposition order of composites and ion exchange properties of these films. © 2019 Chemical Publishing Co.. All rights reserved.