Polyvinylpyrrolidone/Fe3O4 (PVP/Fe3O4) as a Coating on Carbon Steel for Increasing Its Corrosion Resistance in NaCl 3.5%

Polymers can be used as corrosion inhibitors due to their functional groups, which form complexes with metal ions on the metal surfaces. These complexes occupy a large surface area, thereby blanketing the surface and protecting the metals from corrosive agents that presence in the solution. The corrosion inhibition by various cationic polymers such as polyethyleneimine derivative, polyacrylamide derivative, polydicyanodiamide derivative, and anionic polymers suchas polymaleic acid derivative, polyacrylic acid derivative, and Polyvinylpyrrolidone (PVP), have been investigated previously. In the present work, known property of PVP combined with excellent property of nanoscale magnetite (Fe3O4), to produce an anti-corrosion film on carbonsteel. Therefore, firstly a PVP/Fe3O4 nanocomposite was prepared and characterized by FT-IR, XRD, SEM and EDXA. Then, electrochemical techniques such as open circuit potential (OCP),potentiodynamic polarization and electrochemical impedance (EIS) were employed to study the corrosion protection performance of PVP/Fe3O4 on carbon steel in NaCl 3.5% environment. The role of concentration of PVA/G, incubation time of film formation on the carbon steel corrosionhas been investigated. Observed results showed the PVP/Fe3O4 acts as mixed-type inhibitoraffecting the iron dissolution and the cathodic reaction as well. Surface morphology of the protected carbon steel specimen with PVP/Fe3O4 was investigated by SEM and EDXA that confirms the protection of mild steel surface by strong adsorption of nanocomposite. Observed results will be presented and discussed

کلیدواژه ها:

Corrosion ، Polyvinylpyrrolidone ، Magnetite (Fe3O4) ، NaCl 3.5% ، Carbon steel