Mechanical properties and corrosion resistance of electric arc coatings made of flux cored wires

Keywords

arc spraying, cored wires, coatings, microheterogeneity, microhardness, corrosion resistance.

Cite as

Hvozdetskyi V. M., Student M. M., Pohrelyuk І. М., Student O. Z., and Zadorozhna Kh. R. Mechanical properties and corrosion resistance of electric arc coatings made of flux cored wires. Physico­chemical Mechanics of Materials. 2024. 60(1), 098-104.

https://doi.org/10.15407/pcmm2024.01.098

Abstract

Mechanical properties, chemical microheterogeneity and corrosion resistance in a 3% aqueous NaCl solution of arc coatings sprayed by cored wires (CW) with different charge compositions were studied. The CW coatings are characterized by high heterogeneity in chemical composition, which distinguishes them from coatings obtained by spraying with solid wires. The chemical composition of molten drops of CW, crushed by an air stream, and forming a coating, varies significantly. This gradient is caused by the incomplete melting and mixing of the components of the charge and the steel shell in the arc between the ends of CWs during arc spraying of coatings. To ensure the required amount of chromium, boron, and carbon in the melt drops, it is suggested to add certain powders to the CW charge. In particular, the addition of various powders to the CW charge (namely ferrochrome, boron carbide (B₄C), boron ferrochrome, ferroalloys (FeSi, FeMn) and self-flux PG-10N-01) makes the CW melt more homogeneous and creates conditions for the formation of eutectic between the components charge in such CWs as CW 90Cr17BMnSi and CW 90Cr19B3MnSi. This made it possible to obtain arc sprayed coatings with less microheterogeneity and high corrosion resistance, close to the corresponding characteristics of Cr18Ni9T stainless steel.

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