The core of the anodizing process involves constructing a dual-layer oxide film—a barrier layer plus a porous layer—on the metal surface through anodic oxidation reactions in an electrolytic cell. The process logic is as follows: first, purify the substrate through pretreatment; then, control the growth and dissolution equilibrium of the oxide film via electrolysis; finally, impart decorative properties and high corrosion resistance to the film layer through post-treatment (dyeing and sealing). Since the oxide film originates from the workpiece itself, its adhesion far surpasses that of electroplated coatings. Consequently, it finds extensive application in the protection and decoration of aluminum products (such as architectural extrusions, electronic enclosures, and automotive components).
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