As a China Die Casting parts Factory, share with you. Zinc alloy die castings are a bit more difficult to electroplating than other substrates. This is because the chemical stability of the zinc alloy is not very good, and it is easier to be corroded when putting in acid and alkali solutions, and the parts have defects such as bubbles, cracks, and pin holes when the parts are die-casted.
The way to avoid this shortcoming as much as possible is the pre-manufacturing treatment, such as rough inspection, mechanical grinding and polishing, degreasing, etching, activation and pre-plating, etc. Today we will talk about the preliminary rough inspection.
Zinc Alloy Die Cast Part
The blank inspection is to check the blank before plating, which is the key procedure to ensure the electroplating quality of zinc alloy die castings. When the zinc alloy die casting is shaped, the outer layer may have disadvantages such as gates, burrs, horizontal lines, burrs, and nodules. Strict screening should be done for these situations, and there should be no bad products entering the plating process.
It is difficult to polish the machine or grind the rough parts, which can reduce the repair rate in electroplating and reduce the processing cost.
The above is the blank inspection that needs to be done before manufacturing the zinc alloy castings that I share with you today, and I hope to help everyone.
When casting Zinc Alloy Die Cast Part, there are occasional phenomenon of sand holes on the surface, so why is this? Next, let's take a look!
First, you need to see where the sand hole is. If it is a gate or a slag bag, you need to see whether it is not suitable for the thin design of the inlet gate and the slag bag. You can use the thinning method to Try it.
Second, the temperature of the material is too hot. If the grain size is too large, it will also cause pinhole-shaped sand holes.
The third is that if the content of the material returned to the furnace is too high, it will also cause sand holes.
Fourth, the mold design is not suitable, and eddy currents are more likely to occur, and there are also sand holes and blisters.
Fifth, you can try to reduce the rate of fire a little, and the nozzle can be changed to a smaller one.
Now it is more difficult to encounter zinc alloy die-casting parts in the production process!
1. Why are there porosity in the pouring pot?
2. What is the cause of the air holes in the slag bag?
3. What is the reason for the large and small bubbles in the outer layer of the casting?
4. Why is it so difficult to remove the blowhole of die-casting parts?
5. Separation of the die-casting parts, what is wrong?
6. How can peeling of die-casting parts be related to the mold release agent?
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