Ranitidine Drugs as Non-Toxic Corrosion Inhibitors for Mild Steel in Hydrochloric Acid Medium

• DOI: 10.4152/pea.201104273
• Publication Date: 2012-01-09T04:16:41Z
• Authors: R S A Hameed
• Keywords: Hydrochloric acid

Expired ranitidine was tested as a corrosion inhibitor for mild steel in 1 M HCl using different techniques: weight loss, potentiodynamic polarization, open circuit potential and electrochemical impedance spectroscopy.The polarization resistance (R p ) value increased with increase the concentration of inhibitor.Results obtained revealed that performed excellently this medium at 303 K.The protection efficiency increasing concentration.The maximum 90% has been 400 ppm.On other hand, decreases temperature.The adsorption on surface followed Langmuir isotherm model.The activation thermodynamic parameters dissolution were calculated discussed.The negative ∆G ads (-40 kJ mol -1 indicates spontaneous chemical adsorption.Results from EIS loss measurements are good agreement each other.