Compared with metal parts, plastic electroplated products can not only achieve a good metal texture, but also reduce the weight of the product. While effectively improving the appearance and decoration of the plastic, it also improves its electrical, thermal and corrosion resistance. performance. However, if some parts of the plastic electroplating process are not handled properly, the electroplated parts will turn yellow. Next, let's take a closer look.
1. Electroplating process-chemical pollution, water washing, drying, etc. ((For example, if it is not thoroughly dried, the pickling is not done, the plating bath is dirty, the color of the plating layer is stained, and the plating layer is uniform and dense after plating. If the plating is missed, the adhesion is qualified, and the solvent residue will turn yellow. If it is baked, it will be yellower)
2. Storage process-temperature and humidity, contact with other chemicals, etc. (The storage temperature is recommended not to exceed 25 degrees, and the humidity is below 65%.
After the product is tested, it needs to be sealed and stored, and a desiccant needs to be added, and stored at a dry room temperature. Usually the room temperature is around 25 degrees. A strict packaging process is adopted to prevent the coating from contacting corrosive media, such as sulfur and light. The carton is not clean because the surface has undergone bleaching or other treatments. Finally, ensure that the storage place is dry and dust-free, including the packaging process. )
3.Use process-use environment, hand contact.
4. Sometimes the plastic electroplating current is too large...the plating layer will also have slight burn marks...light yellow to light blue spots appear
5. The passivation film is too old to make the color of the passivation film yellow
6. See if the thickness of the plating layer meets the requirements. (Measure the corresponding thickness of the plating layer)
7. The yellowing of electroplating should have a greater relationship with the temperature of the electroplating solution. Use different processes to adjust the time/temperature and other parameters.
8. The surface of the electroplating layer is rough, and the concave front is not treated well.
