Plastic plating-on the reasons affecting the quality of plastic plating.
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1. Material selection of plastic parts.
There are many kinds of plastics, but not all of them can be electroplated.
Some plastics have poor adhesion to the metal layer and have no practical value; some of the physical properties of some plastics and metal coatings, such as the coefficient of expansion, are too different, so it is difficult to guarantee their performance in high temperature difference environment. At present, ABS is the most commonly used in electroplating, followed by PP. In addition, PSF, PC, PTFE and so on also have successful electroplating methods, but they are difficult.
two。. Modeling design of plastic parts.
Under the premise of not affecting the appearance and use, the modeling design of plastic parts should meet the following requirements as far as possible.
(1) Metal luster will make the original shrinkage become more obvious, so it is necessary to avoid uneven wall thickness of the products, so as to avoid shrinkage, and the wall thickness should be moderate, lest the wall is too thin (less than 1.5mm), otherwise it will cause poor rigidity, easy to deform during electroplating, poor adhesion of the coating, and easy to deform and make the coating fall off in the process of use.
(2) avoid the blind hole, otherwise the treatment solution left in the blind hole is not easy to clean, which will cause pollution in the next process, thus affecting the quality of electroplating.
(3) the sharp edge becomes thicker in the electroplating process. The sharp edge in electroplating will cause tip discharge, resulting in the uplift of the corner coating. Therefore, the fillet transition should be adopted as far as possible, and the fillet radius is at least more than 0.3mm. The plated parts are difficult to be electroplated, the central part of the plated part is thinner, the more close to the edge, the thicker the coating is, and the whole coating is uneven, so the plane shape should be changed to a slightly curved surface or a matte surface made of orange peel pattern. The larger the surface area of electroplating, the greater the gloss difference between the center and the edge, and the slightly parabolic surface can improve the gloss uniformity of the plating surface.
(4) minimize grooves and protruding parts on plastic parts. Because the deep concave part is easy to be exposed during electroplating, and the protruding part is easy to be scorched. Groove depth.
Should not exceed the width of the slot 1 stroke 3, the bottom should be an arc. When there is a grille, the hole width should be equal to the beam width and less than 1 prime 2 of the thickness.
(5) the plated parts should be designed with sufficient mounting position, and the contact surface with the hanger should be 2 or 3 times larger than that of the metal parts.
(6) the plastic parts should be designed to make it easy to release the mold when sinking, otherwise the surface of the plated parts will be strained or sprained, or the internal stress of the plastic parts will be caused and the adhesion of the coating will be affected.
(7) when knurling is needed, the knurling direction should be linear and consistent with the demoulding direction. The distance between the knurled stripes and the stripes should be as large as possible.
(8) plastic parts should not use metal inserts as far as possible, otherwise the inserts are easy to be corroded during pre-plating treatment.
(9) the surface of plastic parts should have a certain surface roughness.
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