Method for chemical plating of nickel-phosphorus alloy on surface of beryllium-aluminum alloy

Abstract

The invention relates to a method for chemical plating of a nickel-phosphorus alloy on the surface of a beryllium-aluminum alloy. The method includes the following steps that sand blasting is performed; degreasing treatment is performed; the surface of the beryllium-aluminum alloy is cleaned through an ammonium bifluoride and hydrogen peroxide acidic aqueous solution; cleaning is performed alternately with cold water and hot water; the surface of the beryllium-aluminum alloy is dipped in a nickel-ion-containing mixed aqueous solution for nickel dipping; cleaning is performed alternately with cold water and hot water; nickel plating is performed on the surface of the beryllium-aluminum alloy; and a nickel-plated beryllium-aluminum alloy is put in a drying oven for heat preservation. The method is simple and easy to implement, solution preparation is simple, and the solution stability is extremely high; acidic high-temperature chemical nickel plating is performed after nickel dipping isfinished, whether a low-phosphorous solution or an intermediate-phosphorous solution or a high-phosphorous solution is adopted, the chemical nickel-plated layer is uniform, the phenomena such as localplating omission, needle holes and pitting are avoided, the chemical nickel-plated layer is good in bonding force and not prone to falling off, the surface crystallization is uniform and delicate, and the slight yellow luster of metal nickel is shown.

Description

technical field [0001] The invention belongs to the technical field of electroless plating technology, and relates to a method for electroless plating nickel-phosphorus alloy on the surface of beryllium aluminum alloy. Background technique [0002] At present, there are two ways to form beryllium aluminum alloy materials, casting and powder metallurgy. [0003] Compared with traditional aluminum alloys, beryllium aluminum alloys with a beryllium content of 62% are quite different in terms of molding methods, density, material hardness, linear expansion coefficient, physical properties, and chemical properties. Surface treatment methods suitable for aluminum alloys are not completely suitable for beryllium aluminum alloys. According to Faraday's first and second laws, it is difficult for nickel-phosphorus alloys to be directly plated on the surface of beryllium-aluminum alloys. The beryllium aluminum alloy after zinc dipping for the second time is immersed in an acidic nick...

AI Technical Summary

Problems solved by technology

The beryllium aluminum alloy after zinc dipping for the second time is immersed in an acidic nickel-phosphorus alloy plating solution at 80-90°C after cleaning. It cannot be plated on the surface of beryllium aluminum alloy, and the acidic substance in the solution will continue to corrode the beryllium aluminum alloy substrate, making it more difficult to repair

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