How to do a good job in the surface treatment of zinc alloy

How to do a good job in the surface treatment of zinc alloy

 

     After the zinc alloy die-casting is formed, it needs to be polished to make the surface of the zinc alloy die-casting more smooth, delicate and beautiful, but after the zinc alloy die-casting is polished, the surface treatment of the product must be carried out. If the surface treatment is not carried out, then the zinc alloy die casting will be gradually oxidized, and the original smooth and delicate luster of the zinc alloy will be lost. There are three commonly used methods for the surface treatment of the zinc alloy: electroplating, metal spraying, painted.

 

Electroplating surface treatment of zinc alloy die castings is one of the most commonly used zinc alloy treatment processes. The electroplating process of zinc alloy is to plate nickel on the bottom layer of copper, and then treat it with chromium. In addition, zinc alloy castings can also be directly chrome-plated to improve the hardness and wear resistance of the castings, reduce the friction factor and improve corrosion resistance.

 

The metal spraying surface treatment of zinc alloy die castings is to coat the surface of the treated parts with a thin metal film under high vacuum. Metal spraying treatment of zinc alloy die castings can simulate the appearance of copper, silver, brass, gold, etc. This process is mostly used for die castings. If the surface defects can be concealed by applying primer after degreasing, the workpiece to be treated does not need to be polished. After low-temperature baking, aluminum vapor is deposited on the part under vacuum to form a film. After spraying the varnish for the second time, it is baked to obtain a silver-white paint layer, which can be dyed into any color.

 

     Zinc alloy die castings) surface painting treatment, the workpiece usually needs to be treated with phosphate or chromate solution before painting. For some less expensive parts, acrylic paints that do not adhere very well and contain acidic corrosion components can be used. For parts with high corrosion resistance requirements, epoxy paint or various amine-based paints are used, and then baked after painting. Zinc alloys can be coated with a variety of different paints.