Causes of blisters in alloy buttons
Many button manufacturers will find that their alloy products will sometimes have blisters after plating, which will affect the appearance and quality of the buttons. What are the causes of blistering? First look at the blistering time, the appearance of blisters may have just been die-casting the blank, it may also appear after the polishing process, it may be found after injection or electroplating blisters. According to the analysis of different times, there may be several reasons: the mixing of gas in the solidification process of the molten metal; the shrinkage of the casting when the uneven quality of the casting shrinks; the intergranular corrosion caused by the impure alloy of the composition; and the cracking.
Of course, we have to solve the problem. What can I do to prevent bubbles from forming after the alloy button is finished? The key to controlling the generation of blowholes is to reduce the amount of gas mixed into the casting. For shrinkage cavity: It is necessary to make uniform heat dissipation in all parts of the die casting solidification process at the same time and solidify at the same time. For the phenomenon of intergranular corrosion: The main content is to control the content of harmful impurities in the alloy raw materials. For water patterns and cold streaks, the mold temperature can be increased, the speed of the inner gate can be increased, or the overflow tank can be enlarged in the cold partition to reduce the occurrence of cold streaks. For hot cracks: Do not change the thickness of the die casting abruptly to reduce stress generation; adjust the relevant die casting process parameters; lower the die temperature.
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