Iron corrosion inhibition by olive mill wastewaters in acid medium

L bazzi

Abstract


In this paper, the effect of olive mill wastewater (OMW) as corrosion inhibitor for iron in molar hydrochloride solution was investigated by using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. As results, both used techniques gave nearly the same efficiency of inhibition. Polarisation curves indicated that the OMW act as mixed inhibitor without variation of the hydrogen reduction mechanism. The inhibition efficiency increases by increasing OMW concentration to reach a maximum value of 84% at 4ppm. The effect of temperature on the corrosion of iron has also been studied without and with the inhibitor in the range from 298 to 318K. It was found that the rate of corrosion increases with temperature. OMW was adsorbed on the iron surface according to the model of the Langmuir adsorption isotherm.

 

 


Keywords


Corrosion, inhibition, OMW, Iron, Hydrochloric acid