(v12preprint18)Adsorption MechanisAdsorption Mechanism of Some Chemical Amines Inhibitors for Corrosion Inhibition of Copper-Nickel Alloy in Hydrochloric Acid

摘要

The inhibition of copper corrosion by Naphthylamine (NA),Ethylenediamine (EDA), Tetraethylenepentamine (TEPA), Diethylenetriamine(DETA), and Phenylenediamine (PDA) in 5% HCl have been investigated by weightloss technique at different temperatures. Langmuir adsorption isotherm,Freundlich Adsorption Isotherm and Kinetic-Thermodynamic Model were usedto describe the adsorption process depending on values of surface converge.Maximum value of surface converge was 0.856 for NA at 35 oC and 15 g/linhibitor concentration, while the lower value was 0.01 for PDA at 55 oC and 1g/l inhibitor concentration. The films formed on the copper-nickel alloy surfaceof NA, EDA, TEPA, and DETA appear to obey the Freundlich Adsorption Isothermmore than Langmuir adsorption isotherm. In the other hand, the two-adsorptionisotherms were unsuitable to represent the data of PDA. Results also showedthat the Kinetic-Thermodynamic Model was suitable to fit the experimental dataof the most inhibitors of the present study.