Why aluminum alloy die castings turn black

　　We know that aluminum alloy is a non-ferrous metal structural material, with low density but high strength, good forging and flow properties. However, why is there blackening when using aluminum alloy die castings?

　　I have summarized that there are several main reasons for this

　　1. Do not use cleaning agents improperly:

　　The cleaning agent used has strong corrosion, which leads to air oxidation of die cast aluminum.

　　2. Delayed logistics and warehousing management:

　　Storing aluminum alloy die castings in a warehouse with different aspect ratios results in varying levels of mold growth.

　　3. Unscientific process technology:

　　The negligence of aluminum alloy die castings after cleaning or pressure inspection has set a standard for mold growth and blackening of castings, accelerating the transformation of mold.

　　4. Environmental factors of aluminum alloy profiles:

　　Aluminum is a cheerful metal material that is very prone to air oxidation, blackening or mold growth under high temperature and environmental humidity standards. It is determined by the characteristics of aluminum itself.

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