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Organic coloring

Sulfuric acid anodizing produces a porous, highly adsorptive film that is colorless and transparent, with appropriate thickness, porosity, and adsorption capacity, and can be dyed in various colors. The oxalic acid anodizing process is more expensive than the sulfuric acid method and yields a yellow‑tinted film. When the oxide layer exceeds 50 μm, it develops a natural yellow or brown hue, known as a naturally colored film. Chromic acid anodizing, due to its thin film, limited porosity, and inherent grayish tone, is generally not suitable for coloring. For dyeing, the oxide film must have an appropriate thickness, sufficient porosity, good adsorption capacity, and be free from surface damage and contamination.

Keywords:

Vibratory Polishing

Hard anodizing

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