A kind of electroless nickel-phosphorus composition and its preparation method, electroless plating method and electroless nickel plating part
A technology for electroless nickel-phosphorus plating and composition, applied in the field of electroless plating, can solve the problems of poor coating effect, low electroless plating efficiency, easy agglomeration or sedimentation of micropowder particles, etc. The effect of long-term stability
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Embodiment approach
[0013] The inventors of the present invention have found through further experiments that when the weight-average molecular weight of polyethylene glycol is lower than 6000, the effect of improving the coating is not obvious, but when it is greater than 6000, it is easy to cause the workpiece to not be coated. Therefore, as a preferred embodiment of the present invention, the polyethylene glycol has a weight average molecular weight of 6000, which is referred to as polyethylene glycol 6000 for short.
[0014] Specifically, in the present invention, the nickel salt is the main salt of electroless nickel plating, used to provide Ni 2+ , so that it can react with the reducing agent to generate simple Ni and deposit it on the surface of the workpiece to be plated to form a nickel-phosphorus coating. Preferably, in the present invention, the nickel salt may be nickel sulfate, nickel chloride or nickel acetate commonly used in the prior art, which is not particularly limited in the ...
Embodiment 1
[0033] Dissolve nickel salt, reductant and complexing agent in water respectively according to formula to prepare respective aqueous solutions, wherein also contain buffering agent in the aqueous reductant; Then nickel salt aqueous solution and complexing agent aqueous solution are mixed, then add reductant aqueous solution, then Continue to add sodium silicate nonahydrate and polyethylene glycol to the system until they are evenly mixed, then add stabilizers, brighteners and surfactants, and add ammonia water to adjust the pH value, and finally add diamond micropowder until the system is uniformly dispersed, and this embodiment is obtained. The electroless nickel-plating phosphorus composition S1 of example, its prescription is: nickel sulfate hexahydrate 23g / L, sodium hypophosphite monohydrate 25g / L, trisodium citrate 10g / L, malic acid 3g / L, succinic acid 8g / L L, sodium acetate trihydrate 20g / L, thiourea 2mg / L, sodium silicate nonahydrate 1g / L, polyethylene glycol 600010mg / L,...
Embodiment 2
[0035] Dissolve nickel salt, reductant and complexing agent in water respectively according to formula to prepare respective aqueous solutions, wherein also contain buffering agent in the aqueous reductant; Then nickel salt aqueous solution and complexing agent aqueous solution are mixed, then add reductant aqueous solution, then Continue to add sodium silicate nonahydrate and polyethylene glycol to the system until they are evenly mixed, then add a brightener and a surfactant, and add ammonia water to adjust the pH value, and finally add diamond micropowder until the system is uniformly dispersed to obtain the chemical composition of this example. Nickel-plating phosphorus composition S2, its formula is: nickel sulfate hexahydrate 23g / L, sodium hypophosphite monohydrate 25g / L, trisodium citrate 10g / L, malic acid 3g / L, succinic acid 8g / L, three Sodium acetate hydrate 20g / L, thiourea 2mg / L, sodium silicate nonahydrate 0.1g / L, polyethylene glycol 600010mg / L, 1,4-butynediol 5mg / L,...
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