Zinc alloy die casting how to surface treatment and processing?
Release time:2024-01-29
Zinc alloy die casting how to surface treatment and processing?
Zinc alloy die casting is a kind of precision casting method, which uses high pressure to force metal melting pressure into the metal mold with complex shape.
There are many post-processing processes for aluminum alloy products, mainly in the following categories:
1, sandblasting, the main role is to clean the surface, sandblasting before painting (painting or spraying) can increase the surface roughness, to improve the adhesion has a certain contribution, but the contribution is limited, not as chemical coating before treatment.
2, passivation is to make the metal surface into a state that is not easy to be oxidized, and delay the corrosion rate of the metal method.
3, coloring: There are two main processes for aluminum coloring: one is aluminum oxidation coloring process, and the other is aluminum electrophoresis coloring process, forming a variety of colors on the oxide film to meet certain requirements, such as optical instrument parts commonly used black, commemorative badges
Golden yellow, etc.
Conductive oxidation (chromate conversion film)- used in situations where both protection and conductivity are required.
4, chemical polishing Chemical polishing is the use of aluminum and aluminum alloy production in acidic or alkaline electrolyte solution of selective self-dissolution, to smooth the polishing of the surface, in order to reduce its surface roughness, PH chemical processing method.
This polishing method has the advantages of simple equipment, no power supply, not limited by the shape size of the workpiece, high polishing speed and low processing cost. The purity of aluminum and aluminum alloy has a great impact on the quality of chemical polishing, and the higher the purity, the better the polishing quality
Good. The worse it gets.
5, chemical oxidation: the oxide film is thin, the thickness is about 0.5~4 microns, and porous, soft, with good adsorption, can be used as the bottom layer of organic coating, but its wear resistance and corrosion resistance are not as good as anodic oxidation film;
The chemical oxidation process of aluminum and aluminum alloy can be divided into two categories according to the properties of its solution: alkaline oxidation method and acid oxidation method. According to the properties of the film layer, it can be divided into: oxide film, phosphate film, chromate film, chroma-phosphate film.
6, spraying: for the external protection of equipment,
