Anhydride Derivatives as Corrosion Inhibitors for Carbon Steel in Hydrochloric Acid Solutions

作者：Fouda A S^*; El desoky A M; Ead D M

来源：International Journal of Electrochemical Science, 2013, 8(6): 8823-8847.

• Corrosion inhibition
• carbon steel
• HCl
• EFM
• EIS
• SEM
• EDX

The role of some anhydride derivatives namely: tetrabromophthalic anhydride, 1,2,4,5-benzene tetracarboxylic anhydride, phthalic anhydride, and maleic anhydride (1-4) as corrosion inhibitors for carbon steel in 0.5 M HCl have been studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Polarization studies showed that all the compounds studied are mixed type inhibitors. The effect of temperature on corrosion inhibition has been studied and the thermodynamic activation and adsorption parameters were calculated and discussed. Electrochemical impedance studies showed that the presence of these compounds decreases the double layer capacitance and increases the charge transfer resistance. The adsorption of these compounds on carbon steel surface was found to obey Temkin%26apos;s adsorption isotherm. The morphology of inhibited carbon steel was analyzed by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). The mechanism of inhibition process was discussed in terms of the adsorption of anhydride derivatives on the metal surface.

• 出版日期2013-6