Reasons for Blackening of Aluminum Alloy Die Castings

Reasons for Blackening of Aluminum Alloy Die Castings

Nowadays, the aluminum die-casting industry is gradually developing, and aluminum alloy die-casting is widely used. Aluminum alloy casting is usually made of metal materials, which have good flowability and ductility. But during the production of aluminum alloy die castings, blackening occurs. What is the reason for this?

Aluminum alloy die-casting process

1. The process technology is not scientific.

The negligence of aluminum alloy die castings after sorting or pressure inspection has established standards for mold growth and blackening of castings, accelerating the conversion of mold.

2. Delayed handling of logistics warehousing.

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

3. Internal elements of aluminum alloy profiles.

Many die-casting manufacturers do not do all the necessary cleaning or simple tap water cleaning after the aluminum die-casting and mechanical processing processes, which cannot ensure complete neatness. The surface of die-casting aluminum is left with corrosive chemicals such as release agents, cutting oil, saponification solution, and other dust, which accelerates the rate of long mold spots turning black in aluminum alloy die-casting parts.

4. Environmental factors of aluminum alloy profiles.

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

5. Cleaning agents cannot be used properly.

The cleaning agent used has strong corrosion, resulting in air oxidation of die-casting aluminum.

Many die casting factories neglect many key points during the production of aluminum alloy die castings, which leads to the blackening of aluminum alloy die castings. Only good storage standards can be established, and the problem of organizing, drying, and turning black in a timely manner can be solved very well.