METHOD OF APPLYING WEAR-RESISTANT IRON-NICKEL COATING ON PRECISION PARTS FROM LOW-ALLOY STEELS Russian patent published in 2017 - IPC C23C16/18 C23C16/46 

FIELD: metallurgy.

SUBSTANCE: method of applying a wear-resistant iron-nickel coating on precision parts of low-alloy steels, in which a nickel coating layer with a thickness of 9 to 11 mcm is first applied to the part surface by feeding nickel tetracarbonyl vapour to the part surface heated to the temperature of 225 to 235°C at a rate of 1 to 2 l/h at a residual pressure of 190 to 210 Pa for 5 to 10 min with thermal decomposition of the nickel tetracarbonyl vapour, followed by applying an iron-nickel coating layer by feeding a mixture of nickel tetracarbonyl vapour, iron pentacarbonyl and carbon monoxide in a volume ratio of 1:6(±0.5):15(±1) at a feed rate of the vapour mixture of 110 to 130 l/h to the part surface cooled to the temperature of 175 to 185°C for 25 to 35 minutes, with thermal decomposition of the nickel tetracarbonyl vapour and iron pentacarbonyl.

EFFECT: providing a coating that is effective in achieving optimum adhesion strength, microhardness, roughness, which increases the wear resistance of parts, and increasing the life of the assembly unit containing this part.

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