Chemical nickel-plating method of metal surface

Abstract

The invention relates to a treatment technology of a metal surface, in particular to a chemical nickel-plating method of a metal surface, comprising three steps of: pretreatment of a metal work piece, pretreatment of chemical nickel-plating solution, and chemical nickel-plating. The method ensures that the thickness of the plating on the surface of the metal work piece, especially the metal with a deep hole / groove can amount to more than 130 microns; meanwhile, the method can prevent cavitation on the surface of the metal work piece due to the deposition of the nickel-phosphorus alloy on the surface of complex metal, and has the advantages of even plating, smooth surface, and no burr and the like.

Description

technical field [0001] The invention relates to a metal surface treatment technology, in particular to an electroless nickel plating method on a metal surface. Background technique [0002] Nickel plating is an important part of protective decorative plating. The general nickel plating process, including rack plating and barrel plating, is only suitable for parts with simple shapes, while for inner cavities with complex geometric shapes or deep holes and blind holes, it can only be plated into 1 / 4~1 / 3 of the depth, and the rest Trapped without coating and rust, seriously affecting product quality and life. Electroless nickel plating can meet the requirements, but the maintenance of the electroless nickel plating solution is complicated, the service life is short, and the cost is high. Light, and due to the phosphorous element contained in the electroless nickel plating layer, the plating layer is easy to change color, which affects product quality. Generally, the existing...

AI Technical Summary

Problems solved by technology

The general nickel plating process, including rack plating and barrel plating, is only suitable for parts with simple shapes, while for inner cavities with complex geometric shapes or deep holes and blind holes, it can only be plated into 1 / 4~1 / 3 of the depth, and the rest Trapped without coating and rust, seriously affecting product quality and life

Electroless nickel plating can meet the requirements, but the maintenance of the electroless nickel plating solution is complicated, the service life is short, and the cost is high. light, and due to the phosphorus element in the electroless nickel plating layer, the plating layer is easy to change color, which affects product quality

Generally, the existing electroless nickel plating process can reach a thickness of 50 microns for simple metal workpieces, and only 5 to 20 microns for complex metal workpieces. There is insufficient coating for complex metal workpieces with a thickness of more than 30 microns. Uniform, loose coating, easy to fall off during nickel plating, increased coating burrs, etc.