铝质材料在空气中是极不稳定的，容易生成用肉眼也难以识别的氧化膜。由于HG买球平台合法吗 铝件加工工艺方法的不同，如铸造成型，或是由延压板材直接剪切而成，或是机械精细加工成型，或是经不同工艺成型后又经热处理或焊接等，工件表面都会呈现不同状态，不同程度的污物或痕迹，为此在前处理工序中必须根据工件表面的实际情况选择前处理的工艺方法。
Aluminum materials are extremely unstable in air and are prone to forming oxide films that are difficult to identify with the naked eye. Due to the different processing methods of aluminum parts in Dalian CNC machining, such as casting molding, direct cutting from extruded sheet metal, mechanical fine processing molding, or forming through different processes and then heat treatment or welding, the surface of the workpiece will present different states and degrees of dirt or marks. Therefore, in the pre-treatment process, the pre-treatment method must be selected according to the actual situation of the workpiece surface.
