Corrosion, Mechanical and Catalytic Properties of Coatings Based on FeNiCrWMoCoCB Metallic Glasses

Abstract

This work is devoted to the deposition of coatings based on FeNiCrWMoCoCB metallic glasses on a surface made of 35 steel; the deposition is carried out by electrospark machining in a medium of granules of metals and alloys used as electrode materials. X-ray diffraction analysis showed that an amorphous phase is predominant in the composition of coatings. At a temperature of 1100°C, the amorphous phase crystallizes in borocarbide of the M₂₃(C,B)₆ type, an intermetallic of iron, nickel, and chromium, and αFe phase. Polarization tests of the coating in the NaCl solution (3.5%) demonstrate a lower corrosion current and a higher polarization resistance compared with the 35 steel. It is found during the study of a heat resistance at 600, 700, and 800°C that the use of the FeNiCrWMoCoCB coating on the 35 steel enhances a resistance of its surface to a high-temperature gas corrosion in 8.7, 6.3, and 3.0 times, respectively (the experiment time was 40 h). The wear resistance of the FeNiCrWMoCoCB coatings in a dry sliding wear mode at loadings of 10 and 25 N was 2.2 and 1.7 times higher than for the 35 steel. The samples with the coatings based on the FeNiCrWMoCoCB metallic glasses show a high catalytic activity for a decomposition of a methylene blue solution as at the presence of hydrogen peroxide, as well as without it.