Not all products require electroplating during electroplating, and some products require only partial plating. Therefore, we need to master some methods to protect the non-plated part, and if the first plating is to get a good adhesion.
There are many insulation methods for partial plating. The simplest is to overlap the non-plated parts of the same parts with each other, and only expose the parts that need electroplating equipment plating. In fact, brush plating and bipolar plating are also part of the local plating range.
The encapsulation method is to wrap and seal the unplated parts with plastic film strips, tapes, plastic tubes, rubber stoppers, mats, etc., such as parts that are not plated with inner holes, can be worn by plastic pipes slightly larger than the inner diameter or rubber The plug or pad is tightly closed at both ends; the non-plated parts on the outside can be hot-applied with a plastic tube slightly smaller than the outer diameter, and can also be bandaged. The method is simple and convenient, and the disadvantage is that the parts with complicated shapes are not easy to be wrapped, and the residual solution of the slits is difficult to clean, which easily causes mutual contamination between the solutions.
Insulation with wax preparations is characterized by good adhesion between the insulation layer and the base of the part. The end edges are not lifted during use, and are suitable for parts with high dimensional tolerances on the insulation end. In addition, the wax preparation can be recycled. When the conditions of use are limited or the working conditions are limited, if the above method is difficult, all plating may be performed first, and then the plated portion to be plated is protected and then deplated. This converts harsh environments at high temperatures into room temperature or milder conditions. However, the precision is required to be high. Parts that are not plated are not allowed to come into contact with acids, alkalis and other chemical reagents. This method cannot be used.
Some batches of electroplated parts or one part require more than two kinds of coatings. For example, when the part of the stainless steel vernier caliper is partially plated, an acid-resistant and alkali-resistant polypropylene plastic can be used to make a profile that only reveals the scribed portion. Partial chrome plating is conveniently performed on the fixture with the appropriate auxiliary cathode on the end. There are also some special parts, you can also make a copy box, only to expose the part to be plated, plus auxiliary anode, partial chrome plating, the effect is very good.
Non-metallic parts can be coated with lacquer: for difficult-to-activate, electroplated plastics (such as polyvinyl chloride), a layer of easily activated, electroplated paint can be applied to the surface to be plated. Coating lacquer: In contrast to the use of lacquering, this method is a lacquer that is difficult to activate and galvanize. Toxic lacquer: It is prepared by adding about 10% of sulfide to ordinary insulating varnish. When used, it is coated on the part to be insulated. When the part is activated and electrolessly plated, the poisoning paint has catalytic toxic effect, so that these coating parts can not undergo electroless plating process and play a partial insulation effect.
There are many insulation methods for partial plating. The simplest is to overlap the non-plated parts of the same parts with each other, and only expose the parts that need electroplating equipment plating. In fact, brush plating and bipolar plating are also part of the local plating range.
The encapsulation method is to wrap and seal the unplated parts with plastic film strips, tapes, plastic tubes, rubber stoppers, mats, etc., such as parts that are not plated with inner holes, can be worn by plastic pipes slightly larger than the inner diameter or rubber The plug or pad is tightly closed at both ends; the non-plated parts on the outside can be hot-applied with a plastic tube slightly smaller than the outer diameter, and can also be bandaged. The method is simple and convenient, and the disadvantage is that the parts with complicated shapes are not easy to be wrapped, and the residual solution of the slits is difficult to clean, which easily causes mutual contamination between the solutions.
Insulation with wax preparations is characterized by good adhesion between the insulation layer and the base of the part. The end edges are not lifted during use, and are suitable for parts with high dimensional tolerances on the insulation end. In addition, the wax preparation can be recycled. When the conditions of use are limited or the working conditions are limited, if the above method is difficult, all plating may be performed first, and then the plated portion to be plated is protected and then deplated. This converts harsh environments at high temperatures into room temperature or milder conditions. However, the precision is required to be high. Parts that are not plated are not allowed to come into contact with acids, alkalis and other chemical reagents. This method cannot be used.
Some batches of electroplated parts or one part require more than two kinds of coatings. For example, when the part of the stainless steel vernier caliper is partially plated, an acid-resistant and alkali-resistant polypropylene plastic can be used to make a profile that only reveals the scribed portion. Partial chrome plating is conveniently performed on the fixture with the appropriate auxiliary cathode on the end. There are also some special parts, you can also make a copy box, only to expose the part to be plated, plus auxiliary anode, partial chrome plating, the effect is very good.
Non-metallic parts can be coated with lacquer: for difficult-to-activate, electroplated plastics (such as polyvinyl chloride), a layer of easily activated, electroplated paint can be applied to the surface to be plated. Coating lacquer: In contrast to the use of lacquering, this method is a lacquer that is difficult to activate and galvanize. Toxic lacquer: It is prepared by adding about 10% of sulfide to ordinary insulating varnish. When used, it is coated on the part to be insulated. When the part is activated and electrolessly plated, the poisoning paint has catalytic toxic effect, so that these coating parts can not undergo electroless plating process and play a partial insulation effect.
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