Composition solution for electric nickel-plating on surface of magnesium alloy

Abstract

The invention discloses a composition solution for electric nickel-plating on the surface of a magnesium alloy. The composition solution comprises a zinc immersion liquid, an electric zinc plating liquid and a nickel-electroplating liquid. By adjusting the components of the zinc immersion liquid, the zinc electroplating liquid and the nickel electroplating liquid, a plating process is environmental friendly and safe, and a prepared plated layer is high in corrosion resistance, attractive in appearance and high in binding force with a substrate.

Description

Technical field [0001] The invention relates to the field of electroplating technology, and in particular to a combined solution for electroplating nickel on the surface of a magnesium alloy. Background technique [0002] As a kind of lightweight engineering structural material, magnesium alloy has high specific strength, high specific stiffness and superior shock absorption performance, and has a wide range of applications in the fields of transportation, communications, aviation, and aerospace. However, magnesium alloy has high chemical activity, low electrode potential, and loose surface oxide film, resulting in low protection performance, which restricts the application and development of magnesium alloy. This has aroused people's attention to the corrosion and protection of magnesium alloy parts. A lot of research has been carried out in the areas of magnesium alloy surface anodic oxidation, chemical conversion film, organic coating, surface plating, etc., especially the use...

AI Technical Summary

Problems solved by technology

However, the process is complicated, the repeatability is poor, cyanide is used, the plating solution is poisonous, pollutes the environment, the brightness of the coating and the stability of the plating solution need to be further improved

[0004] In order to overcome the shortcoming of complex process, researchers have developed a direct electroless nickel plating method, such as JP2003073843, which uses chromic anhydride to etch magnesium alloys, performs electroless nickel plating after fluoride activation, and adjusts the electroless nickel plating solution with ammonia water to make it appear Weakly alkaline, once obtained the chemical nickel plating layer with good bonding force and high corrosion resistance, Li Degao et al. used deflocculation → chemical degreasing → light emission → neutralization → activation → pre-treatment in the patent CN1699634A magnesium alloy electroplating method The galvanizing process has obtained a relatively good pre-galvanized layer, and the pre-galvanized solution is cyanide-free, non-toxic and harmless. In the patent CN1737205A, people such as Yang Sheng pickled the magnesium alloy with concentrated hydrofluoric acid (11%) Afterwards, directly electroplate aluminum to obtain a relatively good aluminum coating. Chinese patent CN1641075A has described in detail the surface or activation treatment methods and surface plating methods of magnesium and magnesium alloys. Although these processes are all separated from cyanide electroplating, the treatment before electroplating The process is mostly based on the improvement of the DOW process