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The surface of die-cast products

  • Author:kerry
  • Release on:2021-06-16

There are also a variety of surface treatment for die casting products, which can meet the needs of customers and market applications in various industries. There are a few points that need to be understood:  

1, zinc aluminum alloy surface treatment, sandblasting, the main role is surface cleaning, in painting (spray paint or spray) before sandblasting can increase the surface roughness, to improve the adhesion has a certain contribution, but the contribution is limited, not as good 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 mainly two kinds of aluminum coloring process: one is aluminum oxidation coloring process, the other is aluminum electrophoresis coloring process. Various colors are formed on the oxide film to meet certain use requirements, such as black for optical instrument parts, golden for commemorative MEDALS, etc. Conductive oxidation (chromate conversion film) -- for use where both protection and conductivity are required.  

4, zinc aluminum alloy surface treatment, chemical polishing is the use of aluminum and aluminum alloy produced in acidic or alkaline electrolyte solution of selective self-dissolution, to level the polishing system of the surface, in order to reduce the 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 parts, high casting speed and low processing cost. The purity of aluminum and aluminum alloy has a great influence on the quality of chemical polishing. The higher the purity, the better the polishing quality, and vice versa.