INHIBITION EFFECT OF PHOENIX SYLVESTRIS EXTRACT IN 1M HCL SOLUTION

The inhibitory effect of the ethanol extract of Phoenix Sylvestris on the carbon steel in 1M HCl was studied by weight loss method. The corrosion inhibition efficiency was found to increase with inhibitor content to obtain 97.91% with 40% of the extract at 25℃ during 3 hours immersion time. The inhibition efficiency of the extract decreased as temperature increased. The results showed that the adsorption of the extract on the carbon steel obeys Langmuir isotherm. The activation parameters, apparent activation energy (Eୟ ), the enthalpy of activation (∆Hୟ ) and entropy of activation (∆Sୟ ) for the corrosion of carbon steel in 1M HCl in the absence and presence of the extract were calculated and discussed