Anti Corrosion Ability and Biocidal Efficiency of Surfactants on Mild Steel in Aqueous Environment

K. N. Manonmani, P. Manjula, T. Vennila

Abstract

The inhibition efficiency of DMBP (Diethyl-4-methyl benzyl phosphonate) along with Biocidal action of CTAB and SDS on corrosion of mild steel in neutral aqueous medium has been evaluated by mass loss method, both in absence and presence of Zn2+. It is observed that DMBP exhibits 65% IE individually at ambient temperature. Synergistic influence of Zn2+ increases IE of DMBP to 71%.  Addition of surfactants CTAB (N-Cetyl-N,N,N-Trimethyl Ammonium Bromide) and SDS ( Sodium dodecyl Benzene sulphonate) enhances the inhibition efficiency of DMBP from 65% to 96% and 92% respectively.  The inhibitor system consisting of DMBP (200 ppm) + Zn2+ (90 ppm)+ CTAB (50 ppm) / SDS (40 ppm) offered maximum Biocidal efficiency (BE %) of 100% after killing of microbial bacteria present in aqueous system. FTIR spectra indicates the protective film consist of Fe2+-DMBP and Zn(OH)2.

Keywords

carbon steel, surfactant, Biocidal efficiency, synergistic effect and Zobell medium

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