The ISO 2228-2010 anodic oxidation of aluminium and aluminium alloys - Determination of anodic oxide coatings Film thickness, beam of light Microscope nondestructive method specifies a nondestructive detection method for anodic oxide coatings Film thickness of aluminium and aluminium alloys. This method uses beam of light microscope technology to accurately determine the film thickness of the film layer without destroying the material by analyzing the Optical inspection characteristics of anodic oxide coatings. This technology is suitable for different types of aluminum alloys and anodic oxide coatings, especially in applications requiring high accuracy and non-destructive measurement. The standard provides a scientific basis for the quality control of aluminum and aluminum alloys, and helps to improve the efficiency and accuracy of the production and inspection process.