Abstract

Two new 7-N,N’-dialkylaminomethyl-8-Hydroxyquinolines, namely 7-N,N’-dipropylaminomethyl-8-Hydroxyquinoline (DPQ) and 7-N,N’-dimethylaminomethyl-8-Hydroxyquinoline (DMQ), were synthesized and characterized using ¹H/¹³C NMR and Elemental analysis methods. Corrosion inhibition effect of DMP and DPQ for C40E steel in 1 M HCl was evaluated at different concentrations (10⁻³ to 10⁻⁶M) and temperatures (298 to 328 K) using several experimental and computational approaches. Weight loss and electrochemical studies showed that protection efficiencies (η_max) of DPQ and DMQ increase with increase in concentrations. The DPQ and DMQ showed maximum efficiencies of 96.1% and 94.4%, respectivelyat 10⁻³ M. Polarization measurements showed that DMQ and DPQ act as mixed type corrosion inhibitors. Adsorption of DPQ and DMQ on C40E steel in 1 M HCl obeyed the Langmuir adsorption isotherm. Variation in surface morphology of corroded metallic surface with and without DMQ and DPQ was demonstrated using scanning electron microscopy. Molecular dynamics (MD) simulations studies showed that DPQ and DMQ acquire the flat or horizontal orientation over the C40E steel. DFT analyses revealed that both DPQ and DMQ interact with the C40E steelusing electron-sharing(donor-acceptor)mechanism. Computational analyses conducted using DFT and MD simulations well corroborate the experimental results.

Title

Ismail warad

Publisher

Ismail warad

Publisher Country

Palestine

Publication Type

Prtinted only

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Year

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