Which factors affect the excellentelectroplating quality of zinc alloy die castings?
For zinc alloy die castings to beelectroplated surface treatment, this link is very important. If theelectroplating is not done well, all the work in the early stage will bewasted. Therefore, we must pay attention to the electroplating process of theproduct. Then the quality of electroplating is affected by those factors. Carbide die casting summarizesthe following for you:
1. For the selection of raw materials forzinc alloy die-casting parts, regular national standard materials must beselected for product die-casting.
2.The design of zinc alloy die-casting parts should be reasonable. The shape ofdie-casting parts should consider the concealing ability of electroplating, andtry to reduce the impervious holes, so that it is not easy to carry thesolution in the washing. Cut sharp corners and other parts to make the powerlines evenly distributed during electroplating.
3.The die casting and die-casting mold manufacturingdesign are reasonable, so that the die-casting parts will not suffer fromthe shortcomings of shrinkage, pinholes and looseness. The above-mentionedshortcomings will directly affect the adhesion of the coating.
4.In the production process of zinc alloy die castings, try to reduce thesegregation phenomenon. If aluminum segregates in certain parts, aluminum willfirstly dissolve during degreasing, which will cause pores and pinholes on thesurface of the die-casting parts and cannot be cleaned, resulting in poorbonding strength, resulting in peeling and blistering of the coating.
5.Pay attention to the scale during the grinding and polishing process. The finelayer of 0.05-0.1mm formed during the cooling process of the Magnesium die castingis very important for electroplating. The loss of the fine layer should bereduced as much as possible during the grinding and polishing. If this layer isground and thrown away, What will be revealed will be a porous structure, andno good electroplating layer will be obtained on this layer.
6.The copper-nickel-chromium electroplating layer composed of multiple platingtypes is a negative plating layer relative to the substrate. As long as the soft magneticmold core materia maintenance is effective, the zinc alloy parts willcorrode in the humid air, so it is necessary to ensure that the plating layeris free hole. Otherwise, the corrosion products of the zinc alloy will causeblistering of the coating. Compared with steel parts, the coating should bethicker to be suitable for zinc alloy die castings.
7. Residues of die-casting parts in theprocess of die-casting and die machining shouldbe cleaned as much as possible after processing. Because the residue is a vividmetal, in any process of electroplating, it will react with the solution anddamage the plating solution, which will affect the quality of electroplating.
The main factors affecting theelectroplating quality of zinc alloy die castings are summarized in the aboveseven points. We focus on the customization of the die casting industry andhave our own surface treatment department. The quality is controllable and thecost is controllable. Welcome to consult if you need it!
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