In the process of aluminum alloy CNC machining, the oxidation problem is a common challenge that needs to be solved. Oxidation may not only affect the surface quality of aluminum alloy, but also reduce its corrosion resistance, wear resistance and other properties. The following are several methods to solve the oxidation problem in the process of aluminum alloy CNC machining:

Ⅰ.Anodic oxidation treatment: 

Anodic oxidation is a commonly used surface treatment method, which improves the performance of aluminum products by forming an oxide film on the surface of aluminum products. This oxide film can not only improve the corrosion resistance, hardness and wear resistance of aluminum alloy, but also increase its decorativeness.

There are various types of anodic oxidation treatments, including sulfuric acid anodic oxidation and hard anodic oxidation. Hard anodic oxidation can form a harder and more wear-resistant oxide film, which is especially suitable for application scenarios with high requirements for wear resistance.

Ⅱ.Sand blasting treatment: 

Sand blasting treatment impacts the surface of aluminum products by spraying sand grains or other particulate materials at high speed to achieve the effects of cleaning, deburring and increasing roughness. This helps to improve the adhesion of the aluminum alloy surface and provide a better foundation for subsequent surface treatments such as anodic oxidation.

Ⅲ.Polishing treatment:

Polishing treatment uses tools such as polishing wheels and polishing liquids to polish and brighten the surface of aluminum alloy to obtain a smooth and flat surface. This can not only eliminate the oxide layer generated during the processing, but also improve the surface quality of aluminum alloy.

Ⅳ.Electroplating treatment: 

Electroplating is a process in which aluminum products are immersed in an electrolyte containing metal ions, and the metal ions are deposited on the surface of aluminum products under the action of electric current to form a metal coating. This method can effectively prevent the further oxidation of aluminum alloy and improve its corrosion resistance.

Ⅴ.Laser marking treatment: 

Although laser marking is mainly used for marking and engraving, in some cases, it can also be used to clean or change the micro-structure of the aluminum alloy surface, thereby indirectly reducing the oxidation problem.

In addition, the following points need to be noted to prevent and reduce the oxidation problem in the process of aluminum alloy CNC machining:

• Select high-quality aluminum alloy materials to reduce the impurities and oxides that may exist in the raw materials.

• Strictly control the temperature and environmental conditions during the processing to avoid the oxidation of aluminum alloy caused by high temperature or humid environment.

• Timely clean and dry the aluminum alloy parts after processing to prevent the oxidation caused by the remaining cutting fluid or moisture.