Investigation of anti-corrosive potentials of Cu(II)–Schiff base complex assembled on magnetic Fe3O4, Fe3O4/TiO2 and Fe3O4/SiO2 nanocubes on carbon steel pipelines in 3.0 N HCl
By Khalaf, Mai M.; El-Lateef, Hany M. Abd
Published in Journal of Molecular Liquids
2020
Abstract
Non-precious Cu(II)-Schiff base complex (CuSB) immobilized on magnetic Fe3O4, Fe3O4/TiO2 and Fe3O4/SiO2 nanocubes were fabricated by a simple and cost-effective route. The as-synthesized materials were categorized using FTIR, XRD, FE-SEM, EDX, TEM, and magnetism (VSM) methods in addition to Monte Carlo (MC) simulations. The FTIR analysis established the efficacious formation of the Schiff base complex@magnetic nanocomposites. The characteristic peak of magnetite Fe3O4 appears at a lower intensity due to the successful CuSB complex immobilization on Fe3O4, Fe3O4/SiO2, and Fe3O4/TiO2. TEM and FE-SEM investigations confirmed that, with CuSB loading on Fe3O4 and it’s coated with SiO2 and TiO2 gradually change its crystallite sizes and the appearance of translucent elliptical rods which is specific for CuSB complex. The corrosion protective potentials of as-produced CuSB@Fe3O4, CuSB@Fe3O4/TiO2 and CuSB@Fe3O4/SiO2 nanocomposites were examined for carbon steel pipelines in 3.0 N HCl solution using potentiodynamic polarization (PDP), linear polarization resistance (LPR) corrosion rate, and electrochemical impedance spectroscopy (EIS) measurements. The outcomes revealed that all CuSB@magnetic nanocomposites impede steel corrosion in 3.0 N HCl more than the corresponding CuSB alone. The value of the protection capacity of the CuSB complex is 81.4%, while for CuSB@Fe3O4, CuSB@Fe3O4/TiO2 and CuSB@Fe3O4/SiO2 nanocomposites are 90.9, 93.4 and 98.1%, respectively. These materials, based on PDP tests, worked as mixed-type additives, and the adsorption route follows the model of Langmuir isotherm. Furthermore, the achieved findings were reinforced by surface inspections of steel specimens using FE-SEM/EDX and FTIR studies.