FORMATION OF COMPOSITE COATINGS WITH MAGNETIC PROPERTIES IN AN ELECTROMAGNETIC FIELD

Abstract

The article presents and analyzes the results of the study of the influence of a constant magnetic field on the electrodeposition processes of the ferrum family metals and their alloys. The studies performed indicate the effect of accelerating deposition, improving the surface morphology and hardness of the obtained coatings. Composite coatings applied under the influence of a constant magnetic field can have higher corrosion resistance, improved photocatalytic and magnetic properties than those obtained without it. It has been established that the presence of a constant magnetic field changes the chemical composition of the studied material. There is an increase in the ferromagnetic and a decrease in the diamagnetic component. To assess the magnetic properties, samples of Fe-Co-W and Fe-Co-Mo coatings deposited by unipolar pulsed current at different electrolysis durations were selected, which is due to the difference in the thickness and distribution of the components. The results obtained suggest that in the nonequilibrium process of electrodeposition in three-component alloys, clusters with a short-range order characteristic of a number of intermetallic nonmagnetic compounds are formed, which leads to a decrease in the saturation magnetization of the alloy. The Fe-Co-W coatings are characterized by higher values of the coercive force compared to amorphous alloys, in which the elements P, B, Si act as a non-magnetic component. Probably, for the Fe-Co-W alloy, large clusters with a compositional order similar to the arrangement of atoms in the paramagnetic intermetallic phase with tungsten, along with surface roughness and free volume, play a significant role in magnetization reversal. The results obtained make it possible to classify the obtained Fe-Co-W galvanic alloys as magnetically hard, and Fe-Co-Mo as magnetically soft materials, which, in combination with high microhardness, opens up prospects for the use of such systems in the production of magnetic elements for recording and reproducing information and microelectromechanical systems respectively. With properly designed field structures, new magnetic nanostructures and a new level of control over industrial catalytic and electroplating processes can be created.