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Aluminum oxidation processing Aluminum alloy casting is generally cast in metal molds. Metal aluminum and aluminum alloys have good fluidity and plasticity, but they easily turn black during use. Therefore, the Xiehe Prototype Processing Manufacturer will briefly introduce it to you. Let’s look at the reasons why the surface of the workpiece turns black.

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

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

(3) Warehouse management is not in place. When aluminum alloy die-casting parts are stored at different heights in the warehouse, their moldy conditions are also different.

(4) External environmental factors of aluminum alloy. Aluminum is an active metal and is easily oxidized and turned black or moldy under certain temperature and humidity conditions. This is determined by the characteristics of aluminum itself.

(5) Improper selection of cleaning agents. The cleaning agent selected is highly corrosive, causing corrosion and oxidation of die-cast aluminum.

The above content is what Xiehe Processing Manufacturer introduces to you about the reasons why the surface of the workpiece turns black. I hope it can be helpful to everyone.