Ammonia and nitrogen-free chemical nickel treatment process

Abstract

The invention discloses an ammonia and nitrogen-free chemical nickel treatment process, belongs to the field of plastic electroplating, and solves the problem of difficult sewage treatment due to ammonia and nitrogen contained in traditional chemical nickel. The ammonia and nitrogen-free chemical nickel treatment process comprises preparation of ammonia and nitrogen-free chemical nickel; and in the preparation process, an ammonia and nitrogen-free cylinder opening agent is added in nickel sulfate to obtain the ammonia and nitrogen-free chemical nickel for plastic electroplating. Each 1 L of the cylinder opening agent contains 30-40 g of trisodium citrate dehydrate, 100-110 g of lactic acid, 40-45 g of D-malic acid, 55-60 g of succinic acid, 0.05-0.15 g of isothiourea propyl sulfonic acid salt, 15-30 ppm of bismuth nitrate, 25-40 g of ethylene glycol, and 5-20 g of sodium 2-ethylhexyl sulfate. The chemical nickel contains no ammonia and no nitrogen, greatly reduces the sewage treatmentdifficulty, thoroughly eliminates the ammonia and nitrogen pollution problems, is suitable for electroplating of ABS, ABS/PC and PA plastic, and is excellent in bonding force of plating layers to totally meet the performance requirements; traditional production equipment can transfer a cylinder without needing any change; and the chemical nickel is more stable compared with general nitrogen-contained alkali chemical nickel, is not easy to tip a groove, prolongs the average life compared with the alkali chemical nickel, and can effectively reduce the operation cost.

Description

technical field [0001] The invention belongs to the field of plastic electroplating, and specifically relates to a process for treating nickel with a complexing agent not containing ammonia nitrogen before plastic electroplating. Background technique [0002] Plastic electroplating refers to the whole process of using certain processing methods to first generate activated centers on the plastic surface, using electroless plating or displacement plating to form a conductive film, and then using conventional electroplating to thicken the whole process. Compared with metal parts, plastic electroplating products can not only achieve a good metal texture, but also reduce the weight of the product. While effectively improving the appearance and decoration of the plastic, it also improves its electrical, thermal and corrosion resistance. performance. Electroless nickel plating is by far the most common metallization step in plastic plating. At present, the chemical nickel used in...

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Problems solved by technology

[0004] (1) Due to the strong volatility of ammonia, the concentration of ammonia in the workshop is high, and the smell of ammonia is strong. It is easy to form ammonia fog in the workshop, forming cross-contamination, and is not conducive to the

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