Zinc alloy is easy to mold, has high plasticity, low cost and high processing efficiency. It is widely used in sanitary ware, bags, shoes and accessories. However, the igniting problem of zinc alloy (electroplating; spraying) has been annoying the hardware factory and electroplating factory. friend.
Today, we will collect the experiences of zinc alloy foaming in a number of hardware factory electroplating factories that have been serviced, including the following aspects:
1. At the beginning of the design of zinc alloy products, it is necessary to consider the feeding port and the slag discharge port and exhaust setting of the mold. Because the workpiece flow path of feeding and slagging is smooth and uncontained, no water stains are generated, no dark bubbles are formed, which directly affects whether the subsequent plating is blistering, and the qualified feeding and slag discharging die are die-casting the workpiece, and the surface is smooth and white, Waterless stains.
2. In the mold development, we must also consider the tonnage and pressure of the molding machine. We will personally experience a 20-30 incident of foaming after zinc alloy plating. A hardware factory friend picks up a few million big orders, and the mold opens 8 pieces. The pressure is not enough, the exhaust is not good, no matter how to solve the pre-plating treatment, there is always 20-30% foaming, and finally the mold is blocked 4 pieces. Change to a mold of 4 pieces, and then plating without a bubble.
3. The front surface of the rolling liquid, polishing paste, oxide layer is not cleaned, often there is rolling, the workpiece after rolling, the surface is bright; many electroplating plant pickling process staff will be pickled, lead to The scalding agent attached to the surface is not washed, and blistering often occurs. The roller-rolling agent used in the other rolling mills also has a great relationship, and some surfactants in the pulverizing agent are extremely difficult to wash off.
4. The product is made of alkali copper (a lot of copper bottoms commonly known as hardware friends). Before the plating tank, there is still an oxide film (pickled film) on the surface of the workpiece. The wax-free and degreased film is not treated with a black film. Therefore, the film removal is very important. In the early years, it can be removed by using anti-staining salt. It is environmentally friendly and it is not allowed to discharge waste water containing anti-staining salt. It is recommended to use LJ-D009 release film, which is better than anti-staining salt and can be retreated. Nickel layer and COD emissions in line with international standards
5. Alkali copper plating tank organic matter, many impurities, free cyanide is not in the range, test the alkali copper cylinder composition, see if the sodium cyanide is low or sodium hydroxide is high! If the brightener is added high, the alkali copper cylinder The cleaning is very important, it is recommended to treat the carbon once every 3-5 days.
6. The conductivity of the alkali copper cylinder is also very important. Whether the anode is dissolved normally or not, the anode copper plate is sufficient to cause foaming.
7. Zinc alloy products are foamed after coming out of the oven; it may be caused by uneven temperature of the oven, that is, the temperature is too high. Because the die-casting is not tight, the zinc alloy water-stained trough is easy to enter the acid, and the acid and zinc even have a surface. In the case of plating, a chemical reaction still occurs, and a large amount of hydrogen gas is generated. When the pressure inside is higher than the atmospheric pressure, the high temperature generates bubbles.
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