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Corrosion Behaviour of Carbon Steel in DTPMP-ST-Zn2+ System: An Eco-Friendly System

Author Affiliations

  • 1Department of Chemistry, KCG College of Technology, Karappakkam, Chennai, TN, INDIA
  • 2Department of Chemistry, Chettinad College of Engineering and Technology, karur, TN, INDIA
  • 3Department of Chemistry, Periyar E.V.R College (Autonomous), Trichy, TN, INDIA

Res.J.chem.sci., Volume 3, Issue (10), Pages 16-23, October,18 (2013)

Abstract

Diethylenetriamine penta (methylene phosphonic acid) (DTPMP) in the presence of Zn2+ ions are used to functions as the corrosion inhibitors in controlling the corrosion of carbon steel in 60 ppm Cl. To reduce the toxic nature of Zn2+ has to add other agents like Sodium Tungstate (ST). DTPMP is environment- friendly, non-toxic and non-polluting agent is used to control the rate of corrosion. Here, the corrosion control of carbon steel in 60 ppm Cl was investigated by Weight-loss study, electrochemical measurements and surface examination studies. The corrosion Inhibition Efficiency (IE) offered by 25 ppm of DTPMP, 25 ppm of ST, 10 ppm of Zn2+ was 92 %. The synergistic behaviour of inhibiting action was also calculated. Electrochemical Impedance spectra indicates that surface film formed on the carbon steel shows that high charge transfer resistance and low Double layer capacitance, which suggests the film, is non-porous and protective. Potentiodynamic polarization study shows that the system works as an cathodic inhibitor. The FT-IR spectra reveals that the protective film consists of Fe2+ - DTPMP complex, Fe22+ - ST complex and Zn(OH)2 formation.

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