Thermodynamic, Chemical and Electrochemical Investigations of Calixarene Derivatives as Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Solution

摘要

The focus of this study is to synthesize new calixarene derivatives namely calix[8]arenes (3a) (P1) and(2a) (P2), and to test its performance as corrosion inhibitor of steel in molar HCl at 308K. Polarizationand weight loss measurements were used. The inhibition efficiency was found to increase with-3 calixarene derivatives content to attain 95.14% for (P1) and 80% for (P2) at 10 M. Polarizationcurves revealed that calixarene derivatives affect both cathodic and anodic domains by decreasingcurrent densities and then it may be classified was mixed type inhibitors. The calixarene derivativestested is adsorbed on the surface according to the Langmuir adsorption isotherm. Free enthalpy ofadsorption reveals that calixarene derivatives act from physisorption onto the steel surface.