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Paper Details

Corrosion Inhibition and Biocidal Activity of Carbon Steel in Neutral Aqueous Medium

B. Balanaga Karthik*1, P. Selvakumar2 and C.Thangavelu3

Journal Title:Journal of Chemical, Biological and physical sciences

Weight-loss method, FT-IR were used to study inhibition efficiency in presence and absence of Zn2+ using {diethylenetriamine penta(methylene phosphonic acid)}(DTPMP) as corrosion inhibitor for Carbon steel in 60 ppm Cl-. The weight-loss method gives about the idea of corrosion rate and inhibition efficiency. The blank system that is 60 ppm Cl- gives high corrosion. If 60 ppm Cl- + 25 ppm TSC + 50 ppm DTPMP with 10 ppm of Zn2+ used as the inhibitor, which gives the maximum inhibition efficiency of 87%. The Fourier transform infrared spectroscopy shows that the protective film formed on the metal surface. The influence of immersion period and pH has been studied. As the immersion period increases the inhibition efficiency decreases by the continuous attack of chloride ion. pH influence the inhibition efficiency of inhibitor, as the pH increases the inhibition efficiency also increases and corrosion rate decreases. Biocide used for this study is N-Cetyl- N,N,N-trimethyl ammonium bromide (CTAB), which gives the 100% Biocidal efficiency. As the concentration of biocide increases the inhibition efficiency also increases and also it reduces the concentration of Zn2+ used for the formulation. The suitable mechanism was proposed to the corrosion inhibition for the above said inhibitor formulation.