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Aluminum metal and aluminum alloys have good fluidity and plasticity, but they tend to turn black during use. Why? The following are the reasons for the blackening of the surface of aluminum alloy die castings:

1. Unreasonable process design

The aluminum alloy parts are not handled properly after cleaning or pressure inspection, which creates conditions for the die cast aluminium alloy parts to turn black and accelerate the generation of mildew.

2. Improper storage management

When the aluminum alloy die castings are stored at different heights in the warehouse, the moldy conditions are also different.

3. Internal factors of aluminum alloy

Many aluminum alloy die-casting manufacturers do not do any cleaning treatment after die-casting and machining processes, or simply flush with water, they cannot be thoroughly cleaned, and the surface of die-cast aluminum has corrosiveness such as mold release agent, cutting fluid, saponification fluid, etc. Substances and other stains, these stains accelerate the speed of black mold spots of aluminum alloy die castings.

4. External environmental factors of aluminum alloy

Aluminum is an active metal, which is easily oxidized to become black or mouldy under certain temperature and humidity conditions, which is determined by the characteristics of aluminum itself.

5. Selection of cleaning agent is not appropriate

The selected cleaning agent is highly corrosive, causing corrosion and oxidation of die-casting aluminum.

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