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What is the reason why the die-casting mold is easy to turn black?

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In the process of die-casting mold production, due to some reasons, the die-casting mold will turn black. So what is the reason for this situation? Let’s get to know it together.

1. The process technology is not scientific. The negligence of aluminum alloy castings after cleaning or pressure inspection sets the standard for the growth of mold and blackening of aluminum alloy castings, and accelerates the conversion of mold.
2. Logistics warehouse management is not timely. If the aluminum alloy castings are stored in the warehouse with different aspect ratios, the mold growth will be different.
3. The internal elements of aluminum alloy profiles. Many manufacturers of aluminum alloy die-casting parts do not do everything to clean up after the aluminum die-casting and machining process, or simply fill with tap water, which cannot guarantee complete cleaning. The surface of die-cast aluminum has release agent, cutting oil, Soap foot liquid and other corrosive chemicals and other dirt, this kind of dirt accelerates the rate of blackening of mold spots on aluminum alloy castings.
4. Environmental factors of aluminum alloy profiles. Aluminum is a lively metal, and it is very easy to oxidize and grow black or mold under certain temperature and environmental humidity standards. It is determined by the characteristics of aluminum itself.
5. It is improper to use cleaning agents. The cleaning agent used is highly corrosive, causing the die-cast aluminum to corrode and air oxidation.