Fouda A.S.,Mansoura University |
El-Azaly A.H.,Nile higher institute for engineering and technology |
Awad R.S.,Mansoura University |
Ahmed A.M.,Alex University
International Journal of Electrochemical Science | Year: 2014
Inhibition of carbon steel corrosion by some benzonitrile azo dyes in 1 M HCl has been studied using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The electrochemical measurements showed that the inhibition efficiency increased by increasing the inhibitor concentration. The potentiodynamic polarization measurements indicated that the inhibitors are of mixed type. The results of EIS indicate that the corrosion resistance of the adsorption film formed by inhibitor on metal surface has increased. EFM can be used as a rapid and non-destructive technique for corrosion rate measurements without prior knowledge of Tafel constants. The results obtained from the three different techniques were in good agreement. © 2014 by ESG.