Study of Metal Coatings Deposited by Rotating Wire Tool

Environmentally friendly wear-resistant coatings deposited by a developed rotating flexible tool (metal wire brush) form a layer without visible boundaries inside the coating with a thickness of 3–7 μm. Durometric studies of single-layer coatings (copper, brass, bronze, and antifriction composite consisting of tin, lead, and zinc) and two-layer coatings in combinations of copper-composite and brass-composite showed that the hardness of the latter exceeds the surface hardness of steel samples by 1.2–1.9 times. Single-layer copper M1 ( HV 0.02 from 1862 to 2254) and two-layer M1-composite ( HV 0.02 from 1960 to 2362) coatings have the highest microhardness. X-ray tensometry showed that cold-hardening is formed in the surface layer of the sample under the coating: the calculated values of σ φ are σ φ = 225 MPa for the copper layer and σ φ = –280 MPa for the steel base adjacent to the copper. Metallographic studies showed that the formation of the two types of surface structures differs by the absence or presence of an intermediate zone located between the coating and the deformed base. The intermediate zone is formed when the tension is more than 1.8–2 mm. According to a qualitative estimate, the continuity of the coatings is 90–100%, and the porosity is 18–25%.