Corrosion inhibition of {API} {X120} steel in a highly aggressive medium using stearamidopropyl dimethylamine
By Radwan, A. Bahgat; Sliem, Mostafa H.; Okonkwo, Paul C.; Shibl, Mohamed F.; Abdullah, Aboubakr M.
Published in Journal of Molecular Liquids
NULL
2017
Abstract
Abstract The inhibition efficiency of the stearamidopropyl dimethylamine (SAPDA) surfactant for the corrosion of {API} {X120} steel in a 0.5 M {HCl} solution at different temperatures was investigated using different electrochemical and microscopy techniques. The kinetics and thermodynamic parameters were discussed. The overall results showed that {SAPDA} significantly decreased the corrosion rate of {API} {X120} steel with an inhibition efficiency of approximately 99% at an inhibitor concentration of 136 ?mol L? 1. It was revealed that the adsorption of the {SAPDA} surfactant on the {API} {X120} steel surface followed Langmuir's adsorption isotherm. Polarization studies indicated that {SAPDA} is chemi/physisorbed on the steel surface. Quantum chemical calculations, using the density functional theory, were applied to better understand the relationship between the inhibitor efficiency and its molecular structure.
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