Plastic electroplating-plastic electroplating process.
Huizhou Boluo Tenglong Technology Co., Ltd. serves you wholeheartedly! Mainly engaged in plastic hydroelectroplating processing, with plastic injection molding processing, mold processing and so on!
The technological process of plastic electroplating is as follows: deoiling "water washing" coarsening "water washing" sensitizing "tap water washing" deionized water washing "activation" water washing "electroless copper plating" water washing "electroplating" drying.
It can be seen from the above that problems in any step before electroless copper plating will lead to bubbling. There are many reasons for poor adhesion, and the problems are often caused by deoiling process and coarsening process. If the oil is not removed thoroughly, it will cause peeling and falling off. The lampshade uses chemical deoiling (plastic parts are not suitable to be deoiled with organic solvents). During operation, the temperature rises to 65 ℃ and 70 ℃, shaking the workpiece continuously until no water droplets are hung after washing. Coarsening is a very important process in ABS plastic electroplating. If the coarsening is insufficient, the binding force will decrease; if the coarsening is excessive, the hole will become larger and deformed, and the binding force will also be reduced. Because the divalent tin in the sensitizing solution is extremely unstable, the sensitizing solution is easy to fail, if not adjusted, it will lead to activation failure. Insufficient activation will lead to incomplete deposition of electroless coating, while excessive activation will lead to excessive reduction of active metals on the surface to form a discontinuous film, which will also reduce the adhesion.
Starting from the deoiling, we strictly follow the deoiling formula and operating conditions, check the time and temperature of the coarsening process, and prepare a new sensitizing solution and activation solution. As a result, bubbles still appear after electroless copper plating. After several repeated experiments, it was concluded that bubbling was not caused by deoiling, coarsening, sensitization and activation. At this time, it is suspected that there is a problem with the composition and molding process of the material, because the composition and molding process of ABS plastic are directly related to electroplating.
ABS particles are easy to absorb water, and the moisture content is required to be less than 0.1% before injection. It must be dried in a hot air drying box at 80 ℃ for 2 to 4 hours, and the surrounding environment must also be dry. ABS plastics cannot be mixed with other ingredients. Through the investigation, we found that the injection molding factory piled a large number of molded ABS plastic parts on the wet warehouse floor, and the raw materials before injection molding were not dried. Under our guidance, the raw materials to be injected are dried at 80 ℃ for 2 hours, and then injection molding is carried out after being tested to meet the electroplating requirements. The bubbling problem of the improved lampshade did not appear after electroplating.
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