Abstract

New 8-hydroxyquinoline-based piperazine, namely 5-((4-phenylpiperazine-1-yl)methyl)8-hydroxyquinoline (PPMQ), has been synthesized and examined as the corrosion inhibitors of carbon steel (CS) in a 1 M HCl medium using electrochemical measurements such as electrochemical impedance spectroscopy, potentiodynamic polarization measurements (PDP), gravimetric method, surface morphology analysis (SEM) and quantum chemical computations. The inhibition efficiency was found to increase with increasing inhibitor concentration and to decrease with increasing temperature. PDP data reveals that the PPMQ functions as a mixed type with predominance cathodic effect to an optimal concentration 10^–3 M at 298 K with an efficiency that reaches 96%. Activation parameters (E_a, ΔH_a, and ΔS_a) have been estimated and discussed. The PPMQ molecules physisorbed on the steel surface and comply with the Langmuir adsorption isotherm. SEM results revealed the formation of the protective film of the inhibitor on the CS surface. Moreover, the calculations of density functional theory and molecular dynamics simulation have been used for acquiring more knowledge into the mechanism of adsorption action and inhibition.

Title

Ismail

Publisher

warad

Publisher Country

Palestine

Publication Type

Prtinted only

Volume

--

Year

--

Pages

--