Phenyl Phthalimide as Corrosion Inhibitor for Corrosion of C-Steel in Sulphuric Acid Solution

I. Zaafarany*

Chem. Dept., Faculty of Appl. Sci., Umm Al-qura University, P.O. Box. 118, Makkah Al Mukaramha, Saudia Arabia

 

Received 10 June 2009; accepted 21 October 2009

 

Abstract

The effect of some phenyl phthalimide derivatives on the corrosion of carbon steel in 0.5 M H₂SO₄ solution was studied using weight loss and galvanostatic polarization techniques. The percentage inhibition efficiency was found to increase with increasing concentration of inhibitor and with decreasing temperature. Inhibition was explained by adsorption of these compounds on the metal surface. The adsorption follows Freundlich adsorption isotherms. Some thermodynamic functions were computed and discussed.

Keywords: C-steel corrosion inhibitors, phenyl phthalimide, adsorption.

 

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* Corresponding author. E-mail address: ishaq_zaafarany@yahoo.com