Electrochemical bulk synthesis of Fe₃O₄ and α‐Fe₂O₃ nanoparticles and its ZnCoαFe₂O₃ composite thin films for corrosion protection

Abstract

particles were successfully synthesized by hybrid electrochemical-thermal method. The as-prepared compound was calcined for an hour at different temperature. The crystallite size, morphology, and chemical state of the synthesized powders were characterized by powder XRD, TG-DTA, XPS, SEM/EDAX, TEM, FT-IR, and UV-Vis spectral techniques. Rietveld refinement of X-ray data of the calcined compound exhibits rhombohedral (hematite) structure with space group of R3c (No. 167). The thermal behavior of as-prepared compound was examined. Scanning electron photomicrographs show uniform, randomly oriented hexagonal and spherical like morphology and EDAX measurement showed its chemical composition. The TEM result revealed that the particle morphology was hexagonal with spherical in nature and sizes were in the order of 40-60 nm in diameter and 120-200 nm in length. The absorption and blue shift were noticed in UV-Vis absorption spectra and the band gaps were found to be 4.22-4.29 eV. The electrochemically generated Fe 3 O 4 and a-Fe 2 O 3 nanoparticles were used to fabricate Zn-Co-a-Fe 2 O 3 composite thin films and its corrosion behavior was analyzed by anodic polarization, Tafel extrapolation, and electrochemical impedance spectroscopy (EIS). The results indicate that the Zn-Co-a-Fe 2 O 3 composite thin films have potential applications to corrosion protection.

Structural and Magnetic Properties of Monophasic Maghemite (<i>γ</i>-Fe<sub>2</sub>O<sub>3</sub>) Nanocrystalline Powder

“…In addition, they can be applied in solid-state-phase absorbents of human genomic DNA [4], green catalysts [5], thin film from protection corrosion [6], gas sensors [7], magnetic resonance imaging (MRI) contrast optimization [8] and hyperthermia treatment [9]. In the case of maghemite nanoparticles, their surface can be modified (functionalization) and mechanically controlled by an external magnetic field, therefore they are promising in medicine such as drug deliverers for cancer therapy [10].…”

Production of low-Sn Cu-Sn Alloy Coatings onto Steel Substrate Using Sodium Citrate Bath – Part 1: the Effect of Current Mode (DC or SPC) and Applied Current on the Chemical, Morphological, and Anticorrosive Properties of the Coatings

“…Under the conditions used in the present work, the formation of iron oxide could have probably continued during the DC plating process, enhanced by the surface alkalization due to the HER. The inclusion of iron oxide particles in electrodeposited metallic alloy coatings likely increased the corrosion resistance of these coatings by filling the holes formed during the deposition process 58 . Therefore, the presence of iron oxide inside the coating could have contributed to the anticorrosive protection observed for this coating.…”

“…This result suggests that this coating maintained its anticorrosive performance during the exposure period used in the present studies. The presence of iron oxide in the original sample, filling the pores of the coating, likely contributed to this performance 58 .…”

Determination of High Temperature Corrosion Rates of Steam Boiler Evaporators Using Continuous Measurements of Flue Gas Composition and Neural Networks

“…For this purpose, only data from the boiler area located between the measurements points No. 1-26 were used (i.e., data from the inside the convex polygon whose vertices were the following measuring locations: 1,2,6,13,18,26,25,24,23,22,17,9,3), as shown in Figure 6. This is because, inside this area, neural networks are particularly good at predicting O 2 and CO concentrations.…”

“…Thus, in many cases there is a need to find other solutions to decrease the risk of corrosion. One of them involves covering the tubes by a special layer, protecting them from corrosion [6,7]. This method, however, is very often not economical and its utilization is found mainly in waste incineration or biomass plants.…”