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The anodized oxide film (mainly aluminum oxide) acts as a reliable barrier, effectively isolating the aluminum substrate from air, moisture, acids, alkalis, and other corrosive substances. Compared with unprocessed aluminum sheets, it has significantly improved resistance to rust and corrosion, making it suitable for long-term use in harsh environments such as coastal areas, industrial zones, and outdoor settings.
The oxide film formed by anodization has higher hardness (Mohs hardness 3â5, depending on the anodization process) than the aluminum substrate. It can withstand friction and abrasion from external objects, reducing surface scratches and wear, thus maintaining the product's appearance and performance for a longer time.
The porous structure of the anodized film allows for easy adsorption of dyes, enabling the aluminum sheet to be colored into a variety of colors (such as silver, gold, black, red, blue, and green) with uniform color and good light fastness. Additionally, through processes like sandblasting, brushing, or engraving before anodization, it can achieve diverse surface textures, meeting personalized decorative needs.
The aluminum oxide film has good heat resistance, which can withstand high temperatures up to 200â300°C without decomposing or discoloring. At the same time, it has excellent electrical insulation performance, making it an ideal material for electronic product casings and electrical components.
The anodization process is environmentally friendly, producing no harmful pollutants. The anodized aluminum sheet is non-toxic, odorless, and recyclable. Its oxide film is not easy to peel off or fade, with a service life of up to 10â30 years (depending on the application environment and film thickness), reducing the need for frequent replacement.
| Process Type | Characteristics | Typical Applications |
|---|---|---|
| Sulfuric Acid Anodization | Most common process, low cost, uniform film thickness (5â20 Ξm), good dyeability, and high transparency | Architectural decoration, furniture panels, electronic product casings, daily necessities |
| Chromic Acid Anodization | Thin film (2â5 Ξm), good adhesion to paint and adhesives, excellent corrosion resistance in harsh environments | Aerospace components, automotive parts, industrial equipment that requires secondary coating |
| Hard Anodization | Thick film (20â100 Ξm), high hardness (Mohs hardness 5â7), excellent wear resistance and heat resistance | Mechanical parts, tool surfaces, cylinder liners, mold components |
| Boric Acid Anodization | Good electrical insulation, low toxicity, suitable for precision electronic components | Printed circuit boards, semiconductor components, electrical insulation parts |
Wall claddings, ceiling panels, door and window frames, handrails, and decorative screens. The rich colors and textures can enhance the overall aesthetic of the space.
Building exterior walls, curtain walls, canopies, and signboards. Its excellent corrosion resistance and weather resistance can withstand wind, rain, and sunlight without fading or rusting.
Casings for mobile phones, tablets, laptops, and TVs. The wear-resistant and decorative oxide film can improve the product's texture and service life.
Electrical insulation parts, heat sinks, and printed circuit boards. Benefiting from its insulation and heat resistance properties.
Automotive interior and exterior parts, such as door handles, trim strips, and wheel covers. It is lightweight and corrosion-resistant, contributing to fuel efficiency.
Aerospace components, such as aircraft interior panels and structural parts. The chromic acid anodized sheets have excellent adhesion and corrosion resistance.
Furniture panels, table tops, and cabinet doors. The wear-resistant and easy-to-clean surface is suitable for daily use. Cookware, cutlery, and decorative items are non-toxic and safe, meeting food contact standards.
Hard anodized sheets are used for mechanical parts, tool surfaces, and mold components to improve wear resistance. Chemical equipment linings and pipelines benefit from the corrosion-resistant film that withstands chemical media.
