Pulse electrodeposited ni-co-p/hbn composite coating and its preparation method

Abstract

A pulse electrodeposited Ni-Co-P / HBN composite coating and a preparation method thereof, which uses a metal material as a substrate, first pre-treats the surface of the substrate, and then mixes it with nickel sulfate, cobalt chloride, sodium hypophosphite, and citric acid , trisodium citrate, boric acid, and polyvinyl alcohol as the main components, and hexagonal boron nitride HBN powder as the dispersed phase of the composite plating solution. The HBN particles are surface-modified and dispersed with surfactants and ultrasonic vibrations. Through reasonable settings Pulse electrodeposition parameters, fully stirred to make HBN particles evenly dispersed in the plating solution, HBN particles and matrix metal nickel-cobalt-phosphorus co-deposition and heat treatment under the state of applying pulse current to obtain corrosion-resistant, wear-resistant and anti-friction pulse electrodeposited Ni- Co-P / HBN composite coating; it overcomes the shortcomings of existing composite coatings such as relatively single components, coarse coating grains, low interface bonding strength with the substrate, and unsatisfactory comprehensive performance of corrosion resistance, wear resistance and friction reduction; it is suitable for use as Wear-resistant and anti-friction and corrosion-resistant surface coatings for frictional motion parts in machinery, metallurgy, and chemical industries.

Description

technical field [0001] The invention relates to a pulse electrodeposited Ni-Co-P / HBN composite coating and a preparation method thereof. Background technique [0002] The high hardness, high wear resistance and high corrosion resistance of the Ni-P alloy coating make it widely used in the fields of machinery, petroleum, chemical industry, etc., especially adding insoluble solid particles to the nickel phosphorus plating solution to make the matrix metal Co-deposited with solid particles to form a better nickel-phosphorus composite coating, this type of nickel-phosphorus composite coating can further improve the structure and performance of the coating, such as the structure of the composite coating is denser, their physical and chemical properties, thermal stability, resistance The antifriction performance of grinding has been further improved, and the multifunctional composite coating has become a new development direction for composite material preparation and material sur...

AI Technical Summary

Problems solved by technology

Even in the same plating solution system, due to the different surface structures and charging properties of different dispersed particles, their deposition amount in the matrix metal is very different, that is, some particles are easier to deposit in a certain plating solution, and some particles are easier to deposit in a certain plating solution. The amount of particle deposition is little or almost no deposition, so the surface modification of dispersed particles is very critical for the successful preparation of composite coatings; the stability of the plating solution of electroless Ni-P composite coatings is poor, and dispersed particles are more likely to aggravate the decomposition of the plating solution. The service life of the plating solution is short, and secondly, the temperature of the plating solution required for electroless Ni-P composite coating is high, the deposition speed is slow, the energy consumption is high, and the processing cost is high; , dense coating, and fine grains, which have attracted widespread attention at home and abroad

Images