Plastic plating-Insulation method of partial plating.
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In the electroplating operation, not all products need electroplating, some products only need local electroplating. Therefore, we need to master some methods to protect the non-electroplating part, and if the first plating surface gets a good adhesion coating.
There are many insulation methods for local plating, the simplest one is to overlap and press the unplated parts of the same parts, and only expose the parts that need to be plated by electroplating equipment. In fact, brush plating and bipolar plating also belong to the scope of local plating.
The wrapping method is to wrap and seal the unplated parts with insulating materials such as plastic film strips, adhesive tapes, plastic pipes, rubber plugs, pads, etc., such as the parts with unplated inner holes can be pierced with plastic pipes slightly larger than the inner diameter, or two ends can be sealed with rubber plugs or pads; the outer unplated parts can be covered with plastic pipes slightly smaller than the outer diameter, or bandaged with belts. This method is simple and convenient, but its disadvantage is that it is not easy to wrap the parts with complex shape, it is difficult to clean the residual solution, and it is easy to cause mutual contamination between solutions.
The characteristic of insulation with wax preparation is that the bonding performance between the insulation layer and the part matrix is good, and the end edge will not warp up in the process of use, so it is suitable for parts with high dimensional tolerance of insulation end edge. In addition, the wax preparation can be recycled. When the use conditions are bad or the working conditions are limited, when it is difficult to use the above methods, you can first coat them all, and then protect the parts that have been plated, and then de-plating. This can convert the high temperature and harsh environment into room temperature or milder conditions. But the precision requirement is high, the non-plating part is not allowed to come into contact with acid, alkali and other chemical reagents, this method can not be used.
Some batches of electroplated parts or one kind of parts require more than two kinds of plating, such as partial electroplating of the engraved part of the stainless steel Vernier caliper, a profiling fixture that only reveals the engraved part can be made of acid-resistant and alkali-resistant polypropylene plastic, and the end face can be fitted with an appropriate auxiliary cathode, local chromium plating can be carried out conveniently. There are also some special parts, you can also make a copying box, only expose the parts to be plated, plus auxiliary anode, local chromium plating, the effect is very good.
Non-metallic parts can be paintable: for difficult-to-activate and electroplated plastics (such as polyvinyl chloride), a layer of easy-to-activate, electroplated paint can be applied to the surface to be plated. Stop coating: in contrast to the use of platable paint, this method will be difficult to activate, electroplating paint. Toxic paint: about 10% sulfide is added to ordinary insulating paint. When in use, the coating is applied in the parts that need insulation, and when the parts are activated and electroless plating, because the toxic paint has catalytic toxicity, these coating parts can not have the process of electroless plating and play the role of local insulation.
