ISSN : 0970 - 020X, ONLINE ISSN : 2231-5039
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Investigation of adsorption and inhibitive effect of phosphite on corrosion of mild steel in hydrochloric acid media

L. Herrag1, B. El Bali2, M. Lachkar3 and B. Hammouti1*

¹Laboratoire de Chimie Appliquée et Environnement, Faculté des Sciences BP.717, 60000 Oujda (Morocco). ²Laboratoire du Chimie Solide Minéral, Faculté des Sciences BP.717, 60000 Oujda (Morocco). ³Laboratoire du Chimie Organique, Faculté des Sciences, 1796 Atlas, DEM Fes (Morocco).

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Article Published : 01 Apr 2009
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ABSTRACT:

The inhibition behaviour of a phosphite compound: NaMg(H2PO3)3 .H2 O (abbr. PhMg) on C38 steel in 1 M HCl solutions was investigated at 25 °C using electrochemical and weight loss methods. The results indicated that the title compound inhibited the corrosion of steel and the extent of inhibition increased with its concentrations. A mixed-inhibition mechanism is proposed for the inhibitive effect of PhMg. Effect of temperature is investigated in the (313-353 K) range. The determination of activation and adsorption parameters indicated that the inhibition action in the presence of PhMg is due to physical adsorption.

KEYWORDS:

Corrosion; Mild steel; Corrosion inhibitors; Acid; phosphite

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Herrag L, Bali B. E, Lachkar M, Hammouti B. Investigation of adsorption and inhibitive effect of phosphite on corrosion of mild steel in hydrochloric acid media. Orient J Chem 2009;25(2).


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Herrag L, Bali B. E, Lachkar M, Hammouti B. Investigation of adsorption and inhibitive effect of phosphite on corrosion of mild steel in hydrochloric acid media. Available from: http://www.orientjchem.org/?p=11374



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