Do you know why the surface of aluminum alloy castings undergoes oxidation and blackening

　　With the continuous development of the aluminum alloy die-casting industry, aluminum alloys are widely used in various fields. Do you know why oxidation occurs on the surface of aluminum alloy castings?

　　Due to its active metallic element, aluminum is prone to chemical reactions in the air, and aluminum alloy castings are also alloy materials with high aluminum content that are melted. There are small gaps between grains, and corrosive gases (including moisture containing carbon dioxide) are easily invaded along these gaps, causing corrosion. After corrosion, the oxide of aluminum appears in a powdery fibrous form, and the color of the oxide of copper and other elements in aluminum alloy makes it look like it has gone moldy.

　　Therefore, certain measures will be taken to control the oxidation phenomenon on the surface of aluminum alloy die-casting, such as surface treatment, baking paint, electrophoretic passivation, to solve the oxidation problem of aluminum alloy die-casting parts. Moreover, aluminum alloy die-casting parts should also be stored in a dry and cool environment to prevent oxidation.

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