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Aluminum oxidation processing Aluminum alloy casting is generally cast with metal molds. Metal aluminum and aluminum alloys have good fluidity and plasticity, but they tend to turn black during use. Let's take a look at the reasons for the blackening of the surface of the workpiece.

(1) The process design is unreasonable. Improper handling of aluminum alloy die castings after cleaning or pressure inspection creates conditions for aluminum alloy die castings to become moldy and black, and accelerates the formation of mildew.

(2) Internal factors of aluminum alloy. Many aluminum alloy die-casting manufacturers do not do any cleaning after the die-casting and machining processes, or simply rinse with water, which cannot be thoroughly cleaned. There are mold release agents, cutting fluids, saponification fluids and other corrosive substances remaining on the surface of die-casting aluminum. Substances and other stains, which accelerate the blackening of aluminum alloy die casting mold spots.

(3) Warehouse management is not in place. Aluminum alloy die castings are stored at different heights in the warehouse, and the moldy conditions are also different.

(4) Aluminum alloy external environmental factors. Aluminum is an active metal, which is easily oxidized and blackened or moldy under certain temperature and humidity conditions, which is determined by the characteristics of aluminum itself.

(5) The choice of cleaning agent is not appropriate. The selected cleaning agent is highly corrosive, causing corrosion and oxidation of die-casting aluminum.

The above content is the reason for the blackening of the surface of the workpiece introduced by the aluminum alloy parts processing manufacturer. I hope it can be helpful to everyone.