Studies of Inhibition effect E & Z Configurations of hydrazine Derivatives on Mild Steel Surface in phosphoiric acid

Inhibition effect of 'Cis and Trans' conformations of three families of azines namely: [1.2-bis(pyrrole-2-ylidenemethyl) hydrazine (HZ(1)), 1.2-bis(thiophene-2-idenemethyl) hydrazine (HZ(2)) and 1,2-Bis(furyl-2-lidenemethyl) hydrazine (HZ(3))] on mild steel corrosion in 2.0 M H3PO4, were investigated through electrochemical impedance spectroscopy, Weight loss measurements and X-ray diffraction. A compact HZ(i) inhibitor film was fabricated on the steel surface, and the film showed high inhibition efficiency, also, a reduction of the inhibition efficiency IEexp(%) as the solution temperature. The isomers of Cis and Trans- HZ(i) were studied on the basis of their degree of planarity, their local and global electronic properties as well as their deformation capacity to adhere to the Fe-surface, using DFT and molecular dynamic simulations. A comparative study by standard deviation (SD) of Cis- and Trans-HZ(i) with DFT method shows the higher correlation between X-ray diffraction, H-1 &C-13 NMR Chemical Shifts and Trans geometric form. The adsorption behaviour of the both forms (Cis & Trans)-HZ(i) onto the Fe (111) face were investigated by Molecular Dynamics simulations in vacuo to verify their anti-corrosive efficiency. The results indicate that the adsorption energies, deformation energies and rigid adsorption energies of Trans-HZ(i) was greater than Cis-HZ(i), which agree with the trends of the experimental inhibition efficiencies. (C) 2019 The Author. Published by Elsevier B.V.