double angle aluminum extrusion.Precautions before electroplating zinc alloy die-casting parts

　　Before electroplating zinc alloy die-casting parts, pre-treatment is important because whether it can be processed well will affect the quality of electroplating. If not handled properly, it will cause rework or scrapping of zinc alloy die castings, thereby increasing the scrap rate. So during the electroplating process, there are some things that we need to pay attention to

　　Firstly, it is necessary to understand the structural characteristics of zinc alloy die castings

　　On the surface of zinc alloy die castings, there is a smooth and dense metal layer, with a loose and porous structure below. When polishing zinc alloy die-casting parts, we should be careful not to break the dense layer on the surface of the workpiece, otherwise it will cause blistering, peeling and other phenomena on the coating.

　　Secondly, master the chemical properties of zinc alloy die castings

　　During the process of oil removal or etching, strong acid or alkali should be used. If the plating solution infiltrates the substrate and is not cleaned thoroughly, it will cause blistering and peeling of the coating during the electroplating process, which will affect the yield of zinc alloy die castings. Therefore, strong acid or alkali should not be used.

　　Thirdly, accelerate the connection speed between pre-treatment and electroplating of zinc alloy die-casting parts

　　After removing the oil stains and oxide film on the surface of zinc alloy die-casting parts, the parts should be immediately placed in the electroplating bath for processing

　　Electroplating is used to prevent the surface from regenerating into oxide films or hydrates, which can affect the adhesion between coatings.

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