Abstract

ANTONY, Noreen; SHERINE, H. Benita  and  RAJENDRAN, Susai. Inhibition and biocide actions of sodium dodecyl sulfate-Zn²⁺ system for the corrosion of carbon steel in chloride solution. Port. Electrochim. Acta [online]. 2010, vol.28, n.1, pp.1-14. ISSN 0872-1904.

The inhibition efficiency of sodium dodecyl sulfate (SDS) in controlling corrosion of carbon steel in aqueous solution containing 120 ppm of Cl⁻ in the presence and absence of Zn²⁺ has been evaluated by weight loss method. The formulation consisting of 300 ppm of SDS and 75 ppm of Zn²⁺ gives 93 % inhibition efficiency. A synergistic effect exists between SDS and Zn²⁺. As the immersion period increases, the inhibition efficiency of SDS-Zn²⁺ decreases. Polarization study reveals that this formulation controls both the anodic and cathodic reactions. AC impedance spectra reveal that a protective film is formed on the metal surface.

Keywords : corrosion inhibitor; biocide; carbon steel; synergistic effect; SDS.

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