Faculty of Petroleum and Mining Engineering, Suez Canal University
Abstract
In the present study, the corrosion inhibition characteristic of Sodium Dodecyl Sulfonate (SDSO), a surfactant on corrosion of carbon steel in hydrochloric acid was studied using weight loss method. The obtained results reveal that SDSO is good inhibitor and shows very good corrosion inhibition efficiency (IE) at relatively high SDSO concentration. The IE was found to vary with concentration of inhibitor and acidity. The effect of Brij 58 nonionic co-surfactant addition on IE of SDSO was investigated. It was found that Brij 58 has synergistic influence on the corrosion inhibition efficiency of SDSO. This would be attributed to molecular association of SDSO-Brij 58 that would cause the enhancement of co-adsorption of the two surfactants on carbon steel surface and consequently increase the coverage of hydrophobic layer on Carbon Steel (CS) surface. Special importance is attached to the effect of inorganic additives on the IE of SDSO. KCl and CaCl2 were found to be good promoters to IE of the SDSO. This finding was explained on the basis of that K+ or Ca 2+ ions would create active sites on the SC surface that would attract the negatively charged of SDSO ions and consequently hydrophobic layer (protective film) would be established on SC surface improving IE. However, the addition FeCl3 deteriorates the Inhibitory action (anticorrosion performance) of SDSO. This can be inferred to the formation of ferric dodecyl sulfonate that have very low soluibility product that would precipitate. This cause the deficiency of surfactant ions in the solution and consequently decreasing the adsorption of SDSO on SC surface.
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