Anodized Aluminum Coil

Anodized aluminum coil is a new functional material made from aluminum alloy coil as the base, processed through electrochemical anodizing to form a dense oxide layer, combining metallic texture with high protective performance.

Anodized aluminum coil enhances aluminum’s corrosion and wear resistance. This technology provides a uniform, decorative, and protective surface. Due to its durable surface and resistance to cracking, it is commonly used in building components, home appliances, vehicles, and furniture.

Anodized Aluminum Coil Specifications

Anodized Aluminum Coil Parameters

Features of Anodized Aluminum Coil

• Processing Performance: Moderate hardness, can be bent and formed, suitable for high-speed stamping, no complex surface treatment required.
• Weather Resistance: Standard oxide layer (3μm) is suitable for indoor use, while thickened oxide layer (10μm) can withstand outdoor environments.
• Environmental Friendliness: No paint coating, fireproof (non-combustible at 600℃), compliant with environmental standards.

Advantages of Anodized Aluminum Coil

• Surface Characteristics and Aesthetics: The anodized aluminum coil has a high surface hardness and good scratch resistance, maintaining metallic texture and luster. The micropores in the oxide film can absorb dyes, allowing coloring into various beautiful and vivid colors, including black, gold, and light bronze. The colors are long-lasting and stable, resistant to fading or discoloration. The uniform thickness of the oxide layer helps to control color differences effectively.
• Excellent Durability: Anodized aluminum coil is corrosion-resistant and has good weather resistance, effectively resisting harsh environments such as humidity, UV radiation, and pollutants, resulting in a long service life. The surface oxide film also provides excellent insulation and high breakdown voltage.
• Good Processing Adaptability: Anodized aluminum coil has good workability and strong decorative effect. With moderate hardness, it can be easily bent and formed and can undergo continuous high-speed stamping, facilitating direct product processing. This reduces production costs and shortens production cycles.
• Environmental Protection and Safety: Anodized aluminum coil is non-toxic (when heat-sealed in water) and highly recyclable. It is non-combustible (compliant with DIN 4102 and other standards) and does not produce toxic gases, meeting fire and environmental protection requirements. The surface is resistant to dirt, easy to clean, and corrosion-resistant.

Typical Alloys for Anodized Aluminum Coil

Typical alloys for Anodized Aluminum Coil are from the 1000 Series, 3000 Series, and 5000 Series. These aluminum alloy series each have unique characteristics, meeting the demands of different fields and applications. Anodizing further enhances the corrosion resistance and surface hardness of these alloys, making them suitable for more demanding environments.

1000 Series Anodized Aluminum Coil

Characteristics

• High Purity: 1000 series aluminum alloys are known for their high purity, typically containing 99% or higher aluminum content.
• Good Corrosion Resistance: This makes it perform well in many environments, especially for applications not requiring high strength.
• Electrical and Thermal Conductivity: Exhibits excellent electrical and thermal conductivity.

Common Alloy Numbers

• 1050 Anodized Aluminum Coil: Offers excellent corrosion resistance, suitable for chemical processing, food processing, and other fields.
• 1060 Anodized Aluminum Coil: Widely used in electrical, chemical, and food industries for various applications.

Applications

• Architectural Decoration: Suitable for wall panels, curtain walls, window frames, etc.
• Food Packaging: Used for food packaging materials and aluminum foil rolls.
• Electrical Industry: Commonly used for insulation layers in wires and cables.

3000 Series Anodized Aluminum Coil

Characteristics

• Alloying: Manganese is the primary alloying element, providing good corrosion resistance and processing performance.
• Medium Strength: Compared to the 1000 series, the 3000 series has higher strength but still maintains good formability.
• Good Formability: Easy to process into various shapes.

Common Alloy Numbers

• 3003 Anodized Aluminum Coil: Offers good corrosion resistance and formability, suitable for various consumer and industrial applications.
• 3105 Anodized Aluminum Coil: Commonly used in architectural decoration and household appliance components, with excellent strength and corrosion resistance.

Applications

• Building Materials: Used for roofing and wall materials.
• Containers and Packaging: Commonly used for producing cans, bottle caps, and other packaging materials.
• Automotive Parts: Also used in some automotive components.

5000 Series Anodized Aluminum Coil

Characteristics

• Alloying: Magnesium is the primary alloying element, providing excellent strength and corrosion resistance.
• Excellent Strength-to-Weight Ratio: Very suitable for applications requiring high strength and lightweight.
• Weldability: Good welding performance, suitable for manufacturing complex structural parts.

Common Alloy Numbers

• 5052 Anodized Aluminum Coil: Features excellent corrosion resistance and fatigue strength, suitable for marine environments and pressure vessels.
• 5083 Anodized Aluminum Coil: Performs exceptionally well in extreme environments, commonly used in marine and aerospace fields.
• 5005 Anodized Aluminum Coil: 5005 anodized aluminum coil offers excellent corrosion resistance and aesthetic appeal, mainly used in construction, transportation, and decorative applications.

Applications

• Marine and Shipbuilding: Widely used in marine engineering and ship manufacturing.
• Automotive Industry: Used for body panels and chassis components.
• Industrial Equipment: Such as pressure vessels, storage tanks, etc.

Anodized Aluminum Coil Surface Treatment

Brushed Anodized Aluminum Coil

Brushed anodized aluminum coil features a finely textured surface created by brushing the aluminum before anodizing.

• Advantages: Adds a stylish, modern look; enhances aesthetic appeal; improves resistance to environmental factors.
• Applications: Architectural elements, interior design, and high-visibility installations.

Anodized Embossed Aluminum Coil

Anodized embossed aluminum coil is characterized by its unique patterns and textures, achieved through embossing the aluminum before anodizing (e.g., stucco, hammer, five bar, diamond, 1 bar, etc.).

• Appearance: Features unique patterns and textures, providing depth and visual interest.
• Advantages: Increases decorative appeal, enhances material durability, maintains corrosion resistance.
• Applications: Decorative facades, custom signage, interior design elements.

Mill Finish Anodized Aluminum Sheet

Mill finish anodized aluminum sheet starts with a raw, unprocessed surface that is then subjected to an anodizing treatment.

• Appearance: Retains the natural, industrial look of the metal with minimal alteration.
• Advantages: Preserves the original metal appearance, increases corrosion resistance, extends service life.

Mirror Finish Anodized Aluminum Sheet

Mirror finish anodized aluminum sheet is known for its highly reflective surface, achieved through a combination of polishing and anodizing processes.

• Appearance: Almost glass-like, with high reflectivity and clarity.
• Advantages: Creates stunning visual effects; enhances durability; improves corrosion and rust resistance.
• Applications: Decorative panels, signage, architectural elements, and high-visibility fixtures.

Clear Anodized Aluminum Sheet Metal

Clear anodized aluminum sheet metal features a transparent anodizing layer that preserves the natural appearance of the aluminum while providing enhanced protection.

• Appearance: Maintains the natural color and texture of the metal while providing a protective layer.
• Advantages: Preserves the original appearance, offers better corrosion and environmental damage resistance, easy to maintain.
• Applications: Architectural applications, structural components, and custom manufacturing projects.

Applications and Selection Guide for Anodized Aluminum Coil

Anodized aluminum coil is a high-performance aluminum alloy coil, widely used in building facades, interior decoration, transportation, home appliance panels, precision electronic equipment, and consumer products.

Building and Interior Decoration

Transportation

Industrial and Electronic Equipment

Medical and Public Facilities

Used in hospital wards and public areas for decoration, providing smooth surfaces that are easy to clean and disinfect, ensuring hygiene and safety.

Consumer Goods and Crafts

High-end luggage, kitchenware, crafts, and signage also use anodized aluminum coil for aesthetics, corrosion resistance, and wear resistance.

Specifications of Anodized Aluminum Coil

Hot-Selling Anodized Aluminum Coil Sizes

How to Choose Anodized Aluminum Coil

Alloy Type and Temper: Common base materials include aluminum alloys such as 1060, 3003, 5052, etc. The temper (e.g., H14/H12) affects the mechanical properties.

Oxide Film Thickness:

• 3-5µm: Suitable for general indoor decoration and components.
• 10-15µm: Suitable for outdoor environments, offering better weather resistance.
• 20µm or above: Commonly used for building facades or specific industrial applications requiring high durability. Hard anodized films can even reach 60-200µm.

Color and Surface Treatment: In addition to common colors (natural, black, champagne, bronze, etc.), various surface finishes are available, such as brushed, mirror, embossed (e.g., orange peel, rhombus, bean texture), etc.

Specifications and Dimensions: The thickness, width, and length of anodized aluminum coil should be chosen according to your processing requirements and final product form. Typical thickness ranges from 0.10mm to 6.00mm, and the maximum width can reach 2000mm (coil).

Usage and Processing Precautions

• Processing Characteristics: Anodized aluminum coil can generally be bent, stamped, or sheared. However, for thicker coils or certain alloyed anodized materials, intense forming (such as deep drawing) may cause the oxide film to crack. It is recommended to confirm processing limits with the supplier if necessary.
• Storage and Protection: The product surface is usually covered with a polyethylene protective film, which should be removed within a certain period after processing and before installation (for example, within 6 months after installation) to avoid residual aging. Store in a dry, well-ventilated environment, and avoid contact with corrosive substances.

Anodized aluminum coil is a high-performance metal material with excellent performance, stylish appearance, and environmental friendliness. Its robust oxide film provides long-lasting protection and aesthetic effect, while maintaining good processing adaptability.

Why is Anodized Aluminum Coil So Popular?

Aesthetic Appeal

Provides a deep color and glossy surface, giving products a high-end appearance.

Corrosion and Wear Resistance

• The anodized coating adds extra corrosion protection, suitable for harsh environments.
• Enhances wear resistance, extending the product's lifespan.

Improved Adhesion

Enhances the adhesion of paints and adhesives, allowing for various color and design options.

Anodized Aluminum Coil Process

Pre-treatment

• Purpose: To clean and prepare the aluminum surface for effective anodizing.
• Cleaning: Thoroughly removes oil, dust, and other impurities from the aluminum surface to ensure uniformity and adhesion in subsequent treatments.
• Etching: Chemically etches the aluminum surface to create a matte satin finish. The degree of etching can be adjusted based on requirements (light, medium, heavy).
• Brightening: For aluminum surfaces that are already bright, further enhances gloss through immersion treatment. Different brightness effects can be adjusted as needed.

Anodizing

• Purpose: To form a hard anodized film on the aluminum surface to improve corrosion and wear resistance.
• Surface Preparation: Immerses the pre-treated aluminum coil in an electrolyte bath to prepare for anodizing.
• Forming the Anodic Film: Uses electrical current to make the aluminum coil an anode, forming the anodized film through the current passing through the aluminum surface.
• Composition: The film layer is made of aluminum itself, not an added coating.
• Characteristics: The film layer is hard, porous, and its thickness can be strictly controlled based on the final product's needs.

Post-treatment

• Purpose: To further treat the anodized film, improving appearance and performance.
• Coloring: Colors the porous anodic film to meet different color requirements. Coloring methods include:
• Organic Dye Filling: Injects organic dyes into the pores to add color to the aluminum surface.
• Electrochemical Deposition of Metal Salts: Deposits metal salts at the bottom of the pores to produce various colors and enhance color durability.
• Sealing: Seals the aluminum coil through a hot water bath to close the pores of the anodic film, enhancing corrosion resistance and durability. The sealing process helps improve the stability and weather resistance of the film layer.

Through these treatments, anodized aluminum coils not only achieve an attractive appearance but also increased durability, making them widely used in construction, automotive, electronics, and other industries.

Anodizing Methods

Anodizing is a common aluminum surface treatment method that significantly enhances aluminum's corrosion resistance and hardness. Although different anodizing methods have variations in operation, their basic processes are similar.

Continuous Coil Anodizing

Advantages

• Wide range of metal and film thicknesses: Can handle different thicknesses of aluminum, providing strong adaptability.
• Less material processing: Because it processes coil material, it reduces processing steps.
• Precise color control and uniformity: Achieves more consistent color and coating thickness through continuous processing.
• Cost-effectiveness: Bulk production brings cost advantages and high production efficiency.

Disadvantages

• Exposed edges of stamped parts: The edges of the coils may be exposed, affecting appearance and durability.
• Cracking under severe deformation: Cracks may occur if the aluminum deforms severely during forming.
• Limited to thin sheets and foils: Not suitable for thick plates or complex shapes of aluminum.

Anodized Aluminum Sheets

Advantages

• Small batch production: Suitable for production tasks with low volume requirements.
• Thicker films: Can achieve thicker anodized coatings, enhancing durability.
• Anodized edges: The edges of processed aluminum sheets perform well.

Disadvantages

• Color differences: Since individual sheets are processed, color differences may occur.
• Higher cost: The cost of processing sheets is higher compared to coil processing.
• Film thickness variation: There may be issues with uneven film thickness.
• Cracking during severe forming: Sheets may crack due to severe forming during processing.

Batch or Single Piece Anodizing

Advantages

• Small batch production: Suitable for small batch or single piece production.
• Thicker films: Can achieve thicker anodized coatings, enhancing protective performance.
• Anodized edges: The quality of the edges after processing is high.

Disadvantages

• Color differences: Color variations may occur between pieces, especially in small batch production.
• Complex operation: Processing single pieces or small batches involves more complex operations.
• Higher cost: Single piece processing is more expensive compared to coil or sheet anodizing.

Each anodizing method has its unique advantages and applicable scenarios. Choosing the appropriate method can effectively enhance the performance and appearance of aluminum materials.

Common Questions About Anodized Aluminum Coils

Can anodized aluminum coils be colored?

Yes, anodized aluminum coils can be colored using a process known as "anodizing and dyeing." During this process, the porous anodic layer created during anodizing can be infused with dyes to achieve various colors. The anodic layer helps lock in the dye, ensuring that the color remains stable over time.

Is anodized aluminum safe for direct contact with food?

Yes, anodized aluminum is considered safe for direct contact with food and beverages. The anodic layer is non-toxic and inert, making it suitable for applications where food safety is a concern.