EIS study of SAN/PANI/FLG and ZnO/GO coated cast iron samples in corrosive environments.

Abstract

Corrosion cause severe damage and loss to industrial pipelines and equipment and reduces its life and serviceability. It causes catastrophic failures and leads to huge loss in terms of economical and human life. This Research work is focused on the scope of nanocomposites in the protection of these industrial pipelines and equipment and to contribute in future study of corrosion protection in industrial sector. Experimentation and analysis are conducted on the metal substrates of cast iron obtained from industrial pipeline sample. Comparative study of anti-corrosive properties of hybrid polymer composite SAN/PANI/FLG and ceramic nanocomposite ZnO/GO was conducted on cast iron samples under the corrosive environments of sea water and produced water of crude oil. Electrochemical Impedance Spectroscopy was used for comparative study of nanocomposite coated samples to evaluate the performance of nanocomposites. Values of Impedance and coating capacitance obtained from EIS (AC technique) has shown excellent protection properties of nanocomposites coating in highly corrosive environments. While the Tafel scan (DC technique) was used to determine the corrosion rate of nanocomposite coating and the result obtained were satisfactory for the protection of bare metal samples from corrosion up to certain extent before it gets affected by corrosive medium and gets damaged. Surface morphology of samples were studied by using SEM.SAN/PANI/FLG has offered higher degree of corrosion protection in the environments of sea water and produced water of crude oil as compare to ZnO/GO.