1, the surface of die casting blank is too rough or bad. It is relatively more difficult to deposit high-quality electroplating layer on too rough surface, especially for some products with poor die casting. The surface defects of some materials can not be found and repaired before electroplating, and the yield is relatively low.
2. The electroplating process is unreasonable or the electroplating time is not enough. For example, plastic electroplating copper plating time is too short, current is too small, copper plating bright nickel time is too short or current is too small.
3. The performance and leveling of electroplating solution are poor. For example, the bright copper sulfate used has many impurities, the component content is wrong, and the brightener used is of poor quality and cannot have good filling performance.
4. Poor pretreatment of die casting, such as poor copper plating or nickel plating on the bottom of hardware electroplating or adhesion of organic film.
In addition, there may be leakage during electroplating:
1, to prevent the bath temperature from being too high. When the bath temperature is too high, the evaporation and decomposition of the bath will accelerate, and the aerosol contains high concentration of solute components. At this time, it will seriously pollute the environment, especially the influence of acid-base fog, cyanide and chromium fog on the environment and the harm to human body is even greater.
2. Strictly prevent the electroplating solution from being sucked away by the exhaust fan. When the exhaust fan is improperly configured and the plating solution level is too high, the plating solution is easily sucked away, especially before the tank cover is opened, which not only causes environmental pollution, but also causes the loss of plating solution. When this happens, measures should be taken in time to solve it, such as lowering the plating liquid level and adjusting the suction width.
3. Prevent pollution caused by leakage of plating solution and heating (cooling) tube. The leakage of electroplating bath or heating (cooling) pipes often causes serious pollution, and the reasons for the leakage vary with manufacturing materials and different electroplating types.