The inhibition of corrosion of nickel in H2SO4 solution in presence of some phosphonium inhibitors at different concentrations and temperatures is investigated. The inhibition efficiency increases with increasing inhibitor concentrations. Polarization studies indicate that the compounds used are all mixed inhibitors. The kinetics of corrosion is studied. Potentiodynamic polarization studies indicate that these compounds are good passivators in 1N H2SO4. Inhibition by these compounds due to adsorption on metal surface was also studied and supplemented with infrared spectroscopy and SEM studies. Certain quantum chemical parameters have been calculated to reinforce the electrochemical results.
