Aluminum Alloy Housing with Bumpy Texture via Segmented Anodizing

The surface treatment process is segmented into multiple distinct stages: first anodic oxidation to form oxide layer, mechanical polishing to create bumpy texture, anti-etching protection with photo-sensitive ink for pattern definition, etching to create convex-concave patterns, and second anodic oxidation for final protective layer. This segmentation allows each stage to optimize for specific functions (protection, texture, decoration) independently, resolving the contradiction between protective effect and appearance diversity.

Anti-etching protection is applied before the etching process, creating a protective film that prevents etching in specific areas. This preliminary action enables precise control over where etching occurs, allowing complex convex-concave patterns to be formed while maintaining protective oxide layers in other areas, thus achieving both protection and decorative diversity.

Multiple functions are merged into integrated process steps. For example, the anti-etching protection step combines pattern definition with protective film formation, and the etching step simultaneously creates the convex-concave decorative pattern while the anodic oxidation steps provide protective functionality. This merging reduces the number of separate operations needed while achieving diverse textures and patterns.

The process utilizes parameter changes in the anodic oxidation (voltage, time, electrolyte concentration) and etching (solution composition, temperature, time) to achieve different surface textures and patterns from the same basic materials. By adjusting these parameters, diverse appearances are obtained without adding substantial process complexity, as the same equipment and basic steps are used with varying parameters.