Development Of Composite Coatings Research Articles

Enhanced anti-corrosion and microwave absorption performance of coating with TiO2-wrapped carbonyl iron-modified composites

The magnetic microwave absorption (MA) materials are prone to corrosion in high temperature and high humidity environments, leading to a deterioration in the MA performance, so, the development of composite coatings with comprehensive properties such as excellent absorption performance, corrosion resistance, and oxidation resistance holds significant importance in the field of stealth technology. In this study, a core-shell structure MA materials titanium dioxide coated carbonyl iron particle (CIP@TiO2) was prepared and utilized as a filler in the preparation of composite coatings. The results show that the low-frequency impedance modulus of composite coating improves by three orders of magnitude from 4.5 × 105 Ω cm2 to 2.5 × 108 Ω cm2, demonstrating outstanding corrosion resistance. The TiO2 shell not only improves CIP's electromagnetic parameters but also optimizes the impedance matching of the composite material. The CIP@TiO2 coating achieves a minimum reflection loss of −56.8 dB at a thickness of 1.2 mm and an effective bandwidth of 6.57 GHz at a thickness of 0.6 mm, demonstrating excellent absorption performance. This study provides a novel approach for preparing composite materials with superior corrosion-resistant and absorptive properties.

Experimental Investigation on Electro-codeposition Nickel-Weld Slag Composite Coating

Electro-codeposition process is considered to be an advanced technique for development of composite coatings. In this study, Ni-weld slag composite coatings are prepared from nickel Watts bath using electrodeposition process. It is a novel approach under the utilization of weld slag particles for the preparation of composite coatings which are composed of ceramic patterns. The weld slag particles are embedded in nickel matrix using electrodeposition by adjusting the process parametic conditions. Taguchi L9 orthogonal array is chosen for experimental design by considering the three primary plating parameters, namely current density, temperature of bath and particle concentrations with three levels of each. In order to confirm the deposition, the deposited coatings are examined using optical microscope, SEM micrographs and EDX investigations. The Microhardness of deposits is evaluated using Vickers microhardness tester with the applied testing load of 100-gram force. The direct effects and significances of plating parameters on the microhardness have been explored using the signal to noise ratio, mean effect studies and analysis of variance. The process parameters are ranked by position through the significance studies. The Ni-weld slag particles produces greater microhardness values than pure nickel coating.

Paint-And-Varnish and Adhesive Composites Based on Phenolic Oligomers

A review is given of research conducted in recent years in the field of the development of composite coatings and adhesive compositions based on phenol formaldehyde oligomers. Film-forming materials of different composition, the properties of coatings based on them, and also the fields of their application are described. Adhesive composites for the gluing of different materials – metals, wood – also used as binders are presented. The practical importance of the conducted research is substantiated.