Zinc alloy die casting parts are usually used in the electronics, electrical peripherals and other parts, so excellent appearance, good corrosion resistance is a very important and necessary features. Zinc alloy surface treatment generally have the following types of treatment:
Plating to improve the appearance of zinc alloy products, density, corrosion resistance has a good effect. The most commonly used plating nickel, tin, copper, silver, gold. Zinc alloy die casting finished product before plating, should check good, the product surface is of good quality, whether loose, cracks, pores, bubbles, cold lines, pinholes and so bad. Otherwise it is not suitable for plating.
Other product processing flow, such as polishing, grinding need to be dealt with before plating, so product design, mold design, product design to be uniform shape, as far as possible to avoid the uneven relief, large plane and sharp edges, make the product more easily polished.
Lacquer can be used for decorations, protection, signs. Painting can also hide part of the zinc alloy die-casting surface defects, the product surface more texture. In this process, the concentration of paint, spray to strictly abide by the operating practices to avoid the orange peel, eye, dumb, oil, oil and so bad.
3. Chemical film processing
Chromate treatment can improve the corrosion resistance of zinc alloy products, increase the appearance of the product surface. The product surface to generate a protective film, so that zinc alloy castings easier to paint and color.
4. Electrostatic spraying
Electrostatic spraying can also form a protective film for zinc alloy castings to make the casting surface more smooth, more aesthetically pleasing and more textured. And improve corrosion resistance.
Electrostatic spraying should also strictly abide by the work requirements, according to the requirements before spraying to check whether the equipment is operating normally, and choose the best product cage position, adjust the castings walking speed, the temperature, open the oil viscosity and open the oil should be strict Control, to ensure that each casting can be evenly and completely sprayed with oil.