Process for preparing self-lubricating chemical composite plating

Abstract

The present invention relates to a preparation method by self-lubrication composite electroless plating. It belongs to the field of electroless plating. The procedure is: 1) Fluorine carbon surfactant C20H20F23N2O4I which is commonly used for foam extinguisher is dissolved in PTFE latex emulsion to form mixture A, and SiC or Si3N4 or Al2O3 is dissolved in cetyl trimethyl ammonium bromide to form mixture B. 2) Preparation of plating solution, i.e. nickel sulfate, lactic acid, sodium acetate, sodium hypophosphite, propenysulfocarbamide are added in plating cell at room temperature, and pH is adjusted with sodium hydroxide. 3) Composite electroless plating: the mixture said A and said B are added in the plating solution prepared in step 2) and then heated. Consistent stirring is kept during plating and then self-lubrication composite electroless plating layer is obtained. The invention adopts different suitable surfactants depending on different grains to improve Zeta potential of the grain surfaces and suspensibility of the grains in plating solution through adsorption effect of different grains on different surfactants so as to further realize co-deposition of grains.

Description

technical field [0001] The invention relates to a preparation method of a chemical composite coating, in particular to a preparation method of a self-lubricating chemical composite coating, and belongs to the technical field of chemical plating. Background technique [0002] For a long time, electroless plating and electroless composite plating technology have been more and more widely used because of its simple operation and low cost. Ni-P-X (X is SiC, Al) obtained by the above process 2 O 3 , Si 3 N 4 and other hard particles) composite coating has good wear resistance; while Ni-P-X (X is polytetrafluoroethylene, graphite, MoS 2 Equal lubricating particles) composite coating has good anti-friction properties. These two types of composite coatings have been used in many industries involving friction and wear conditions. However, with the rapid development of technology, people have higher and higher requirements for materials. Although the first material mentioned abo...

AI Technical Summary

Problems solved by technology

At present, the self-lubricating chemical composite coatings that have been researched and developed at home and abroad include Ni-P-PTFE-SiC, but due to the large difference in the physical properties of PTFE and SiC particles such as density and adsorption, the two kinds of particles are different in the co-deposition process. The interfacial effect is easy to occur between them, so that the particle deposition is rare and the distribution is extremely uneven, so that the wear resistance and friction reduction performance of the composite coating cannot meet the requirements

[0003] Found through the retrieval of prior art document, Y.S.Huang, X.T.Zeng, I.Annergren et al. in " the development of chemical plating Ni-P-PTFE-SiC composite coating " one article (" surface coating technology " 2003, 167 : 207-211) reported that only fluorocarbon surfactants were used to promote the deposition of PTFE and SiC particles. In this method, PTFE emulsions were treated with fluorocarbon surfactants, so that the surface potential of PTFE particles was significantly improved, while the ceramic particles were resistant to fluorine. The adsorption of carbon surfactant is poor, and as a result, the surface potential of ceramic particles remains at a low level, and the obvious potential difference between the two kinds of particles makes the particles appear inhomogeneous during deposition