Causes of blistering after electroplating of zinc alloy die castings
First of all, it is clear whether the zinc alloy die casting foaming or coating foaming, such as zinc alloy die casting foaming, may be the following problems: 1. Material impurities exceed the standard, especially lead. 2. the surface of the product is certainly not completely qualified. There should be slight water marks and tiny bubbles. The workpiece can be heated to 150 degrees for 30 minutes to see if there is any problem. If the coating is foaming, it may be surface degreasing and dewaxing is not thorough, or it may be not cleaned after pretreatment, zinc alloy die-casting before plating is not completely baked dry, or it may be zinc alloy die-casting surface oxidation for too long.
Perhaps not compacted, bubbles hidden in the inside, although the surface is good, in addition, no water lines sometimes does not mean that your runner must be good, mold temperature is too high will cover up your water lines and density is not good, but loose. Or do you know what kind of castings are qualified? Pay more attention to the mold, and finally consider the surface treatment.
This is a fairly common problem. The internal density is not enough. There are compressed pores on the surface. Material problems, nozzle material added too much, material temperature is too high, too much plating process abnormal will also be such a problem! Cleaning, dewaxing...
Zinc alloy die casting electroplating foaming is a very common problem, small braid to give you a few ideas to try: 1, embryo no water lines, no bubbles, but zinc alloy die casting product internal how, to measure the density of the product, it is not enough density, in other words, there are pores in the product, otherwise there will be no electroplating Foaming after the phenomenon, by improving the mold exhaust can be solved, but if the mold opened wrong, then only re-opened the mold...
