Solutions to some problems of zinc alloy die casting

Zinc alloy die castings are currently widely used in various decorative aspects. Some common defects of zinc alloy die casting are surface blistering. Defect characteristics: Protruding small bubbles are found on the surface of die-casting parts. These bubbles are found after die-casting and appear after polishing or processing or after spraying or electroplating.

the reason:

1. Zinc alloy die casting is caused by intergranular corrosion:

Harmful impurities in the composition of zinc alloys: lead, cadmium and tin will accumulate in the grain boundaries, causing intergranular corrosion. The metal matrix is ​​broken due to intergranular corrosion, and electroplating accelerates this scourge. Parts affected by intergranular corrosion will expand and lift the coating, creating blisters on the surface of the casting. Especially in a humid environment, intergranular corrosion will deform, crack or even destroy the casting.

2. A hole in the zinc alloy die-casting leads to:

Mainly stomata and contraction mechanism. The stomata are usually round, and most contractions are irregular. (1) Causes of pores: a. During the filling and solidification of molten metal, pores will be formed on the surface or inside of the casting due to the intrusion of gas. b. The gas evaporating from the paint invades. c The gas content in the alloy liquid is too high and will precipitate during the solidification process.

With the rapid development of the die-casting industry, the die-casting process has become a widely used and fast-growing metal hot forming process, especially zinc alloy die-casting and aluminum alloy die-casting, especially zinc alloy die-casting. This is very important to people, so what are the advantages of the zinc alloy die casting process? The following is a brief introduction to everyone.

Advantages of zinc alloy die-casting production. Die casting is a method that requires the use of high pressure to push molten metal into a cavity. Manufacture and die-cast zinc alloy die-cast parts are commonly used zinc and other non-ferrous metals, including copper, lead, magnesium, tin and other materials. This process is suitable for the production requirements of small and medium-sized parts for mass production. This process is very convenient, so it has become a widely used casting method in the zinc metal processing industry.

During the production of zinc alloy die-cast parts, different shapes from simple to complex need to be designed. Compared with other processes, casting is more suitable. In order to produce a mixture of parts that can measure the width of zinc, this technology can provide a smooth surface for die-casting parts, and has good dimensional accuracy and recognition capabilities. The wall thickness of die casting is thinner than sand casting and metal casting.

In this manufacturing process, threaded blades, heating elements and high-strength bearing surfaces can be set according to relevant design factors. technology also effectively reduces or eliminates the need for secondary operations. Another characteristic of the zinc alloy die casting method is that it has the advantages of fast production speed and high tensile strength.

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