Abstract

ALAOUI, L. Malki et al. Phosphate of Aluminum as Corrosion Inhibitor for Steel in H₃PO₄. Port. Electrochim. Acta [online]. 2008, vol.26, n.4, pp.339-347. ISSN 0872-1904.

The influence of phosphate of aluminum (PA) on the corrosion inhibition of mild steel in phosphoric acid solution was studied using the weight-loss method. The electrochemical performance of the inhibitors was also investigated through potentiodynamic polarisation and EIS measurements. The inhibition efficiency of inhibitor increases with concentration to attain 84 % at 10^-2M of PA in 0.33 M H₃PO₄. Polarization studies show that PA is a mixed-type inhibitor and acts both on the cathodic and anodic reactions without changing the mechanism of the hydrogen evolution reaction. The inhibition efficiency of PA is temperature-dependent in the range 298 - 363 K, the associated activation energy has been determined. PA adsorbs on the steel surface according to a Langmuir isotherm adsorption model.  

Keywords : mild steel; phosphate of aluminum; phosphoric acid; corrosion.

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