Pretreatment process of aluminum plate and aluminum alloy

Pretreatment process of aluminum plate and aluminum alloy

Aluminum materials are extremely unstable in the air, and it is easy to generate oxide films that are difficult to identify with the naked eye. Due to the different processing methods of aluminum parts, such as casting and molding, or directly shearing from the rolling plate, or mechanical fine processing and forming, or after being formed by different processes and then heat treatment or welding, etc., the surface of the workpiece will show different states, different degrees of dirt or traces, so the pretreatment process method must be selected according to the actual situation of the workpiece surface in the pretreatment process. In the pretreatment process, it is necessary to pay attention to: although the natural oxide film on the surface of the fine machined parts is just formed, the unmachined surface is left with an overly thick oxide layer formed during the casting process, and a layer of oily sintered coke is formed before the workpiece is transferred to the heat treatment or welding process, the treatment precautions for these cases are as follows:

Fine processed parts in the pretreatment process need to pay attention to the problem: although the natural oxide film on the surface of fine processed parts is just formed, easy to remove, but greasy and heavy, especially in and around the hole (due to the lubrication needs of the machining process and added), such workpieces must first be cleaned by organic solvents, if directly washed with alkali not only greasy and heavy is difficult to remove, and the fine processing surface can not withstand long-term strong alkali corrosion, the result will also affect the roughness of the workpiece surface and the coordination of tolerances, and may eventually become a waste.

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