Abstract
In the present study, new magnetite nanoparticles coated with rosin amidoxime prepared to apply as corrosion inhibitors for steel in 1 M HCl. Rosin midoxime was prepared from from hydrolysis of rosin-acrylonitrile Diels Alder adduct using hyroxylamine in basic medium. A new monodisperse magnetite nanoparticles was prepared by a simple and inexpensive co-precipitation method followed by capping with rosin amidoxime. The chemical structure, particle size and morphology of magnetite capped with rosin amidoxime were characterized by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and dynamic light scattering (DLS). Corrosion protection properties of magnetite-RK/amidoxime nanoparticles on steel in hydrochloric acid have been studied by polarization and electrochemical impedance spectroscopy (EIS). The results show that magnetite-RK/amidoxime nanoparticles. acts as good inhibitor and inhibition efficiency (%IE) increases with inhibitor concentration. Potentiodynamic polarization measurements indicated that magnetite-RK/amidoxime nanoparticles. acts as a mixed type inhibitor. EIS results indicated that the charge transfer resistance (Rct) increases with magnetite-RK/amidoxime concentration. IE values obtained from potentiodynamic polarization showed a reasonable agreement with those obtained from EIS measurements.