With the development of society and the advancement of technology, equipment manufacturers have higher and higher requirements for the internal quality and appearance of aluminum alloy shell parts. In order to meet the ever-increasing internal quality and appearance requirements, manufacturers have adopted various methods to improve the internal and external quality of aluminum alloy shell parts. In production practice, the external quality of aluminum alloy parts is often improved by anodizing surface treatment process. After anodizing treatment, a layer of anodic oxide film with a certain thickness, strength and beautiful appearance can be formed on the surface of the aluminum alloy shell parts. Through electron microscope observation, it can be found that the structure of the anodic oxide film is honeycomb, and the center has a micropore that grows perpendicular to the surface of the aluminum substrate, showing the beauty of the shape that cannot be seen in other surface treat...