Expired Voltaren Drugs as Corrosion Inhibitor for Aluminium in Hydrochloric Acid

摘要

The effectiveness of Expired Voltaren (EV) drug as corrosion inhibitor for aluminium in 1 M HCl wasinvestigated by weight loss and electrochemical methods. Polarization curves revealed that theinhibiting action of the EV is mixed-type. The addition of the inhibitor molecules shifted the corrosionpotential (Ecorr) to more noble direction. The influence of temperature on the adsorption of inhibitoronto aluminium surface has been reported. Activated thermodynamic parameters were computed anddiscussed.The adsorption of the EV was found to obey the Langmuir adsorption isotherm. Theinhibition efficiency of expired Voltaren, EV obtained by all methods was in good agreement witheach other.