Corrosion protection performance of ceria-copolymer bilayer coating on low nickel stainless steel in 0.5 M H _2SO _4 medium

摘要

In this paper, we have reported the anti-corrosion performance of ceria / poly (indole-co-pyrrole) (Ce/(poly(In-co-Py)) bilayer coating on low nickel stainless steel (LN SS). Electrochemical polymerization of (poly (In-co-Py)) was achieved on ceria-coated LN SS (CeO _2/LN SS) in acetonitrile medium containing LiClO _4 (ACN-LiClO _4) by cyclic voltammetric technique. The coatings were characterized by analytical techniques like Fourier transform infrared spectroscopy, scanning electron microscopy with energy dispersive analysis of X-ray, respectively. The mechanical behavior of the coatings was studied using peel test, hardness and wear resistance tests. The corrosion defensive performance of this bilayer coating on LN SS was investigated using electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy in 0.5 M H _2SO _4. These results show that the bilayer coating on LN SS lowered the permeability of corrosive ions present in the acidic medium and thus acts as a barrier against the attack of corrosive environment.