Abstract
Magnetite nanoparticles (MNPs) have an excellent electrochemical behaviors in aqueous medium having several industrial applications. New quaternized ionic liquids derivatives, namely octahydroxyethylamino pentaertheritoltetrapropanoate p-toluene sulfonate (OATPS) is synthesized to use as capping agent for MNPs to increase their dispersability and chemical stability to inhibit the corrosion of steel in aqueous acid solution. The chemical structure of OATPS is elucidated from NMR analyses. Electrochemical behaviors of magnetite coated with OATPS in acid chloride solution have been investigated to determine its corrosion inhibition efficiency (IE%). Different concentrations of both capped magnetite and OATPS concentrations are ranged from 1 to 150 ppm were used to study the effect of concentrations on its adsorption at steel surfaces in acid chloride aqueous solution. The electrochemical measurements indicate that the OATPS IL and capped magnetite behave as mixed-type corrosion inhibitors. Moreover, the adsorption process of OATPS IL obeys the Langmuir adsorption isotherm at steel/water interface. The electrochemical techniques showed agreements for determining IE% of magnetite capped OATPS IL for steel in acid chloride solution.