Journal of Science and Geosciences

Investigation of azodyes as corrosion inhibitors for dissolution of carbon steel in hydrochloric acid solution


A. Francis, Quinete Natalia, Maes Anke and Shama Afifi

The effect of some mono azo dye compounds on the dissolution of carbon steel (type L-52) in 2 M hydrochloric acid solution was studied using weight loss and galvanostatic polarization techniques. The inhibition efficiency was found to increase with increasing inhibitor concentration and decreasing temperatures. Inhibition was explained by formation of insoluble complex adsorbed on the metal surface. The adsorption follows Langmuir adsorption isotherm. The formation of stable complex was studied by conductometric titration. The stiochiometric ratio was found to be 1:1; 1:2 for Fe 2+ / dye compounds and the mechanism of inhibition was explained in terms of these values. The thermodynamic functions of adsorption process was calculated and discussed.


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