Abstract
The development of nontoxic effective corrosion inhibitors for metallic substrates is an issue of great importance for protection of metal alloys and components. Surface properties of new stabilized magnetic nanoparticle (MNP) colloids coated with Myrrh gum were investigated. The natural product Myrrh gum was used as capping agent to produce highly dispersed coated magnetite nanoparticles. The structure and morphology of the magnetic nanogel were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and ultrasizer. Drop shape analyzer was used to examine the surface properties of the produced magnetite nanoparticles. The corrosion inhibition efficiencies of aqueous solutions of Myrrh and Myrrh capped magnetite for steel in 1M HCl solution have been investigated at different concentrations of the inhibitor using potentiodynamic polarization and electrochemical impedance spectroscopy measurements. The results showed that corrosion resistance increased by increasing the inhibitor concentration and inhibition efficiencies up to 91% can be obtained. Polarization curves revealed that this compound acts as mixed type inhibitor The inhibition efficiency calculated from these techniques are in reasonably good agreement.