METHOD FOR PRODUCING CORROSION-RESISTANT COATING Russian patent published in 2022 - IPC C23C14/06 C23C14/35 C23C14/56 

FIELD: chemical, engineering, mining and oil industries.

SUBSTANCE: invention relates to a method for obtaining a corrosion-resistant coating on parts of a friction pair and can be used in the chemical, engineering, mining and oil industries, in tool and repair industries to improve the protective properties of the surface of the tool and friction pairs in an aggressive environment, as well as to increase their heat resistance when processing under dry friction conditions. The part of the friction pair in the tooling is cleaned in a glow discharge of two chromium targets in an argon medium. Then, ion cleaning of the part of the friction pair is carried out by two arc evaporators with titanium cathodes. Then, without turning off the arc evaporators with titanium cathodes, a sublayer of titanium nitride is applied in an argon and nitrogen environment by the method for electric arc evaporation at a negative bias voltage on the parts of the friction pair - 180-200 V, pressure 0.4-0.5 Pa, arc current Ti 80-90 And the distance between the cathode and the part of the friction pair is 200-220 mm. Then, when the arc evaporators are turned off and two magnetrons with chromium targets and two magnetrons with aluminum targets are used at a bias voltage of 80–90 V, alternating layers of chromium and aluminum nitride with a crystallite diameter of 30–50 nm and 60–100 nm in gas mixture of nitrogen and argon at a pressure of 0.4-0.5 Pa. The deposition of alternating layers is repeated at least two times, and an amorphous layer of chromium and aluminum nitride is applied with the top layer at a nitrogen content of 20-25% for at least 10-15 minutes. The application of the mentioned layers of chromium and aluminum nitride is carried out at a distance from the targets to the part of the friction pair, which is 160-170 mm, at a rotation speed of the planetary mechanism, where the part of the friction pair is fixed, 20-25 rpm and a temperature of the part of the friction pair 200-250°C.

EFFECT: obtaining a coating with high corrosion resistance, wear resistance, impact resistance and crack resistance, having a high adhesive strength of the sublayer with the material of the friction pair part and between the layers.

1 cl, 8 dwg