| Abstrakt: |
Applying the method of HVOF-spraying with the use of mechanically-alloyed powders based on the amorphized FeMoNiCrB alloy with the additions of (Ti, Cr)C and FeTiO3 compounds, the coatings with amorphous crystalline heterophase structure were produced. The coatings of FeMoNiCrB‒(Ti, Cr)C and FeMoNiCrB‒FeTiO3 systems have a dense fi ne-grained structure with a porosity of 2.4 and 1.2 % and a hardness of 5510 ± 250 and 4410 ± 190 MPa, respectively. The study of corrosion resistance and resistance to fretting corrosion of the developed coatings was conducted. It is shown that the use of composite powders based on FeMoNiCrB alloy with the addition of (Ti, Cr)C and FeTiO3 compounds as spraying materials allows increasing the protective properties of the coatings compared to the coating of FeMoNiCrB alloy. It was found, that in the case of producing composite FeMoNiCrB‒(Ti, Cr)C and FeMoNiCrB‒FeTiO3 coatings on the steel base St3, the corrosion resistance of the specimens in the solutions of 3% NаСl, 10% Н2SО4 and 10% КОН is increased by 7.3, 9; 3.9, 5.3 and 9.5, 9.7 times, respectively. FeMoNiCrB‒(Ti, Cr)C and FeMoNiCrB‒FeTiO3 coatings have a fairly high resistance to fretting corrosion, which is 4.6 and 5.8 times higher than the resistance of titanium ОТ4-1 alloy. The obtained results indicate the prospect of using HVOF-spraying of the developed FeMoNiCrB-(Ti, Cr)C and FeMoNiCrB-FeTiO3 coatings to strengthen and restore surfaces operating in aggressive environments and those subjected to fretting corrosion. 26 Ref., 6 Tabl., 4 Fig. [ABSTRACT FROM AUTHOR] |
