Many producers are expected to discover that die-casting aluminum is not suited for anodizing treatment while performing surface treatment on various aluminum materials. All of this is governed by the composition of die-casting aluminum and the anodizing characteristics, so why is die-casting aluminum not suited for anodizing?

To begin with, anodizing requires no imperfections on the aluminum’s surface, and the aluminum must be relatively pure because the anodized layer must be uniform and flat. Excessive impurities and other components will inevitably affect the thickness of the film formed during anodic oxidation, and may even effect whether the film is formed at all. The most crucial thing to remember is that other metal components can directly modify the color of the anodized film as it forms, which is a death sentence for coloring following anodic oxidation.

In general, cast aluminum alloys and die-castings have a high silicon concentration. Even when a specific dust extractor for die-casting aluminum is employed, the anodized film may be dark in color, and obtaining a colorless and transparent oxide film is challenging. The hue of the anodized film changes from light gray to dark gray to dark gray as the silicon content increases. As a result, cast aluminum alloys are ineligible for standard anodizing. However, anodizing options for die cast aluminum are available. Die-casting parts can complete the structure, edges and corners, and oxidation quality that are difficult for forging parts, automotive parts/CNC components, and die-casting part quality is critical. The quality of the anode is determined by a slight change and meticulous process control. Manufacturers of oxidation die castings must scientifically regulate the flow channel technology, die casting process, and mold post-processing processes. This sequence of tight control techniques ensures the seamless manufacturing of oxidation quality.

CNCJY is a technological business that specializes in aluminum alloy surface treatment technologies. The company unites R&D, production, sales, and service with the philosophy of quality-oriented, technology-leading, and service-oriented, striving for excellence, and is dedicated to the perfection and creation of new aluminum alloy surface treatment technologies.