Synthesis of Corrosion-Resistant Coatings by Non–Vacuum Electron Beam Surfacing: Production, Structure, and Properties

Abstract

The structure and properties of coatings formed on the structural steel surface are studied. The coatings were applied by non-vacuum electron beam surfacing of Cr–Ni–Ti powder mixtures. The high-quality surface layers have been obtained, the corrosion resistance of which corresponds to the properties of the austenitic Ni–Cr stainless steel. For this purpose, the phase composition and elemental distribution of alloying components in the coatings are assessed, the structural features are analyzed, and the physical, mechanical, and adhesion characteristics are determined. It is shown that coatings up to 2400 μm thick, the structure of which is a γ-solid solution of Ni and Fe, are formed on the steel surface. The ultimate strength of the formed material reaches 856 MPa, which is by a factor of 1.3 higher than that of the austenitic Ni–Cr stainless steel 12–Cr18–Ni9–Ti. The adhesive strength of the coatings reaches 560 MPa. The corrosion resistance of layers of different compositions surfaced on low-carbon steel under the influence of a 65% nitric acid is studied. It has been established that the corrosion resistance of surface-alloyed layers in the 65% nitric acid solution exceeds the resistance of the base material by 30–70 times.