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ADS, ALS, AHDS and ADDBS Surfactants as Corrosion Inhibitors for Carbon Steel in acidic Solution

Author Affiliations

  • 1Material Science Laboratory, Department of Chemistry, Ch. Devi Lal University, Sirsa, Haryana, INDIA
  • 2Department of Chemistry, Singhania University, Rajasthan, INDIA

Res.J.chem.sci., Volume 2, Issue (7), Pages 1-6, July,18 (2012)


The role of some surfactants towards corrosion control of carbon steel in 1.0 M HCl has been investigated using weight loss and galvanostatic polarization techniques. Surfactants investigated are Ammonium decyl sulphate (ADS), ammonium laruryl sulphate (ALS), ammonium hexadecyl sulphate (AHDS) and ammonium dodecyl benzene sulfonate (ADDBS). Results showed that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface. The corrosion inhibition efficiency was found to increase with surfactant concentration and decreased with increasing temperature which is due to the fact, that the rate of corrosion of carbon steel is higher than the rate of adsorption of surfactant molecules. The inhibiting action of surfactants are considerably enhanced by the addition of KI, due to the increase of the surface coverage and therefore indicate the joint adsorption of surfactants and iodide ions. Thermodynamic parameters for adsorption and activation processes were also determined. Galvanostatic polarization data indicated that surfcatants act as mixed-type inhibitors.


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