As a Die Casting Parts Supplier, 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 relatively
easy to be corroded when put 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 work, 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 Cast Part is shaped, the outer layer may have disadvantages such as gates, burrs, horizontal lines, burrs, and nodules. Strict screening should be done in these situations, and there should be no bad products entering the electroplating 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.
When designing the geometry of zinc alloy castings, try to avoid structures such as deep recesses in blind holes. Therefore, when designing parts, it is required to leave drainage process holes that are convenient for the flow of solution and gas without affecting the appearance and use of the parts. In this way, the plating can be carried out well, and the degree of contamination of the plating solution is reduced. With the advancement of science and technology, various processing and manufacturing industries are also advancing with it. Many of the equipment and tools used in life are composed of alloy castings, like common zinc alloy die castings and Aluminum Alloy Die Cast Part, do you know?
The surface of the zinc alloy die casting is a dense layer with a thickness of about 0.1mm, and the inside is a loose porous structure. When designing the die and using the die casting process, try to make the surface of the workpiece as smooth as possible to reduce casting defects such as cracks, porosity, cold gaps, flash and burrs. For this reason, mechanical cleaning must be carried out. At this time, it is necessary to avoid damaging the dense layer on the surface, so as not to expose the porous substrate to cause electroplating difficulties and affect the quality of electroplating. The release agent is often used in zinc alloy die-casting, and certain attention should be paid to the use and removal of the release agent, which is one of the factors that affect the adhesion of the coating.
Knowing the influencing factors of zinc alloy die-casting parts, it will focus on the production process. In addition, when using it, care must be taken to avoid damage to it.