Five methods of plastic plating-Local hard Chromium plating.
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Five methods of Local hard Chromium plating.
(1) Insulation method: that is, the non-plated parts are wrapped with insulating materials to achieve the purpose of local electroplating. These insulating materials include the use of plastic sheeting, insulating tape, insulating coatings and so on.
(2) profiling fixture method: for example, when the scale part of the stainless steel Vernier caliper is locally electroplated, acid-and alkali-resistant polypropylene plastic can be used to make a profiling fixture that only exposes the scale part, and cathodic protection can be done. Partial chromium plating can be carried out. There are many parts can be made into profiling fixture, as long as the plated part can be chrome plated.
(3) shielding method: in hard chromium plating, shaft parts often appear the phenomenon of thick at both ends and thin in the middle. In order to achieve the uniformity of the coating, plastic plates can be used to block both ends of the anode, and several holes should be punched on the plastic plates to make the solution part convect. in this way, part of the dense power line at both ends of the shaft will be shielded, making the power line bypass the plastic plate, so that the middle part of the part is more concentrated. The deposited coating will be more uniform.
(4) Segmentation method: due to the different uses of some parts, the thickness of chromium plating is also different, so the segmented method can be used for electroplating. When a certain section reaches its thickness, lift the part out of the slot, insulate this section, and then continue to plating other parts until all the plating is finished.
(5) Brush plating: for large and difficult to disassemble parts that need local chromium plating, it is best to use the method of brush plating. Because brush plating does not need a bath, it can be operated outdoors, and the deposition speed of chromium plating is fast and pollution-free, which is especially suitable for local chromium plating or local repair.评星 双语对照
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