A kind of nickel plating method of bearing cover

Abstract

A nickel plating method for a bearing cap, the steps: configuration of chemical nickel plating solution: nickel sulfate 15-20gmol / L, sodium hypophosphite 10-18gmol / L, trisodium citrate dihydrate 15-20g / L, sodium acetate 0.2- 0.3mol / L and citric acid monohydrate 6-8g / L, thiourea 0.2-0.4mg / L, maleic acid 5-10mg / L, brightener EN-960.2-0.5ml / L, butynediol Diethoxy ether 30~50mg / L, sodium dodecylbenzenesulfonate 2~5mg / L; pH value is 5.5‑6.5; put the bearing cover to be plated in the electroless nickel plating solution at 75‑95℃, The time is 1-1.5h; during the nickel plating process, the bearing cover is turned over every 1-10min; after the nickel plating is completed, it is rinsed with water, and then dried to obtain the plated part. It has the advantages of uniform coating, small error of coating thickness on both sides, and simple operation.

Description

technical field [0001] The invention relates to the technical field of bearing caps, in particular to a nickel plating method for bearing caps. Background technique [0002] The bearing cover is a part of the bearing seat, and its main function is to locate the bearing, prevent dust, prevent pollution, maintain the oil level, increase oil circulation, lubricate, and dissipate heat. Therefore, the quality of the bearing cap directly affects the realization of the above functions or functions. At present, nickel plating is used on the surface of the bearing cap to prevent the surface wear of the bearing cap during high-temperature operation, and on the other hand, due to factors such as water, oil, high temperature, and dust in the operating environment, it also prevents corrosion of the bearing cap body. The surface of the bearing cover is nickel-plated to overcome the above defects. The existing nickel plating process is generally divided into electrolysis or chemical meth...

AI Technical Summary

Problems solved by technology

The existing nickel plating process is generally divided into electrolysis or chemical methods; among them, electrolysis requires a large amount of heavy metal solution, which causes serious environmental pollution, and is used less and less; while chemical methods refer to the use of a large amount of heavy metal solution in aqueous solution under certain conditions. The metal ions are reduced by the reducing agent and precipitated on the surface of the solid substrate, and the coating is continuously thickened

However, this chemical plating method also has certain limitations, especially for flat plated parts such as bearing caps. Generally, it can only be plated on both sides. The process lasts about 1.5 hours; due to the special use environment of the bearing cover, such as automobiles, especially new energy vehicles, there are very high requirements for the thickness and uniformity of the coating. For example, the thickness of the coating needs to be 8 microns, and the deviation of the coating on both sides cannot Too large; but the above-mentioned traditional craft is difficult to meet the above-mentioned requirements

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