Influence of Alloying (Cr, Fe, Ni) on the Corrosion Resistance of Layers Formed by Electron-Beam Processing

Received: 27.06.22. Revised: 21.07.22. Accepted: 01.08.22. Available online: 12.08.22.The studies were carried out on the equipment of the Cen-tral Collective Use Center "Structure, mechanical and physical properties of materials" of NSTU (No. 13.TsKP.21.0034, 075-15-2021-698).The greatest positive effect was obtained in the process of electron-beam surfacing of the powder mixture of "amorphous” boron and 10 wt.% chromium.The corrosion resistance of chromium-modified layers is related to the morphology of the chromium borides Cr2B formed during surfacing.This result is novel, and the developed material can be recommended as a protective corrosionresistant layer for products made of structural chromium-nickel steels.The paper presents the results of comparative analysis of the properties of coatings based on chromium, nickel and iron borides. The alloy obtained in the process of electron-beam surfacing of the powder mixture “amorphous boron – 10 wt.% chromium” has the best properties. This is explained by the structures, fine chromium borides Cr2B and complex iron borides (Fe, Cr)2B, distributed in the austenitic matrix. The material modified in this way in a nitric acid solution corrodes at a rate of 0.02 mm/year. In sulfuric acid, its corrosion rate is 0.81 mm/year.The work on microscopic characterization of samples was supported by the Ministry of Science and Higher Education of the Russian Federation, project No. 121031700314-5. The work is done in accordance t0 TP_XXT 1-22