Anodized aluminum

1. What Is Anodized Aluminum?

Anodized aluminum is aluminum sheet, coil, plate and profile treated by an electrochemical anodizing process. Unlike paint, powder coating or electroplating that attaches coatings on the metal surface, anodizing grows a dense, integrated aluminum oxide (Al₂O₃) film from the aluminum substrate itself. The oxide layer bonds metallurgically with the base metal and will never peel, flake or fall off under normal service conditions.

TMR AL specializes in full-series anodized aluminum raw materials, including anodized aluminum sheets, coils, checkered tread plates, embossed stucco aluminum coils, precision aluminum slugs and embossed freezer aluminum panels. We support customized alloy, film thickness, surface texture, color and post-printing processing for signage, lithography, construction, electronics, machinery and household industries.

Core Production Workflow of Anodized Aluminum

• Pre-treatment: Degreasing → alkaline etching → neutralization & desmutting → full rinsing
• Anodizing electrolysis: Form controlled oxide film in sulfuric acid bath
• Optional coloring: Organic dyeing / electrolytic metal salt coloring / natural clear finish
• Sealing treatment: Hot water sealing or cold nickel-cobalt sealing to block film pores
• Drying, inspection, cutting & packaging

Anodized aluminum plate sheet is suitable for various signs and nameplates, and can be laser engraved, silk-screen UV printed, and curtain wall panels, aluminum-plastic panels, fireproof panels, electrical panels, cabinet panels, and furniture panels; it is also widely used in mechanical parts, aircraft and automobile parts, precision instruments and radio equipment, building decoration, machine casings, lamps and lanterns, electronic consumer products, household appliances, automobile decoration, interior decoration, handicrafts and other industries.

2. Main Anodizing Process Classifications & Technical Parameters

We supply three mainstream anodizing types to match different functional and decorative demands:

Type I: Chromic Acid Thin Film Anodizing (0.5–7.5μm)

Ultra-thin oxide layer with minimal dimensional change. High flexibility and uniform corrosion resistance. Ideal for ultra-thin precision parts, aerospace connectors and thin aluminum accessories with strict tolerance requirements.

Type II: Standard Sulfuric Acid Decorative Anodizing (5–25μm, Most Widely Used)

Balanced decoration, corrosion resistance and dye absorption performance. Supports full color customization (silver, black, champagne gold, rose gold, bronze, blue, red etc.). Indoor use ≥3μm film thickness; outdoor curtain wall & exterior panels adopt 12–25μm thick film, passing 1500–3000h salt spray test (ASTM B117).

• Natural clear anodizing: Retain original metallic silver texture, zero fading, eco-friendly, perfect for high-end minimalist products.
• Colored anodizing: Electrolytic coloring delivers superior UV resistance, suitable for long-term outdoor exposure; organic dyeing offers rich bright colors for consumer electronics and crafts.

Type III: Hard Coat Hard Anodizing (25–100μm)

Produced under low temperature & high current density. Ultra-high surface hardness up to 500HV, outstanding wear resistance and dielectric insulation. Used for mechanical friction parts, automotive structural components, heavy-duty equipment and marine anti-corrosion panels.

Other Custom Surface Finishes

• Bright polished anodizing: Mirror reflective surface via chemical polishing before oxidation
• Matte etched anodizing: Uniform soft matte texture, anti-glare for display panels and nameplates
• Stucco embossed anodized coil: Anti-scratch, anti-fingerprint, dedicated to refrigerator & freezer inner liners
• Tread checkered anodized plate: Anti-slip surface for walkway, equipment platform and vehicle floor

3. Available Aluminum Alloy Substrates & Specifications

Applicable Alloy Grades

• 1xxx pure aluminum (1060/1100): High ductility, uniform oxidation color, best for signage & lithography printing
• 3xxx aluminum-manganese (3003): Excellent anti-rust performance, standard for refrigeration lining & cable trays
• 5xxx aluminum-magnesium (5005/5052): Superior corrosion resistance, ideal for humid household appliance panels
• 6xxx aluminum-magnesium-silicon (6061): High strength, matched for mechanical parts, curtain wall panels and structural frames

Standard Size Range

• Anodized aluminum coil: Width 600–1900mm, thickness 0.3–3.0mm
• Anodized aluminum sheet: Thickness 0.6–8.0mm, max width 2000mm, customizable length
• Checkered / embossed plate: Custom embossing pattern, thickness 1.5–10mm
• Precision aluminum slug: Small-sized anodized blank for laser engraving metal business cards, nameplates

4. Core Advantages of TMR AL Anodized Aluminum Sheets & Coils

4.1 Superior Anti-Corrosion & Anti-Oxidation Performance

The compact ceramic-like Al₂O₃ oxide film completely isolates aluminum substrate from air, water and corrosive mediums. Fully rust-proof and oxidation-free long-term. 20μm thick exterior-grade anodized panels maintain stable color for 10+ years under direct sunlight without fading or chalking.

4.2 High Hardness & Excellent Scratch Resistance

Surface hardness far exceeds bare aluminum and coated aluminum. Anti-fingerprint, static-free, not easy to absorb dust. Repeated wiping and daily cleaning keep the surface bright without abrasion marks, retaining pure metallic luster permanently.

4.3 Outstanding Decorative Texture & Diverse Customization

Natural metal texture cannot be replicated by painting. Multiple surface options: matte, bright mirror, brushed, embossed, checkered. Rich color system including natural silver, black, gold, titanium, bronze, customized brand colors. Supports secondary deep processing: laser engraving, silk-screen UV printing, digital lithography, embossing, bending, stamping and cutting.

4.4 Easy Processing & Cost-Efficient Production

Moderate hardness for continuous high-speed stamping, bending, CNC cutting and forming. Finished anodized materials skip secondary surface treatment, greatly shortening production cycles and lowering manufacturing costs.

4.5 Eco-Friendly & Fully Recyclable

Anodizing is a pollution-reduced surface treatment process without volatile organic solvent. The oxide film is pure aluminum oxide; 100% of aluminum substrate can be recycled with zero loss of metal value, meeting global green building and electronic environmental standards.

4.6 Wide Temperature & Multi-Scenario Adaptability

Stable performance under high temperature, low temperature and humid environments. Suitable for indoor constant-temperature spaces, outdoor open-air construction, refrigeration low-temperature equipment and electrical power parts with heat generation.

5. Full-Range Industrial Application Scenarios

5.1 Signage & Printing Industry

• Laser engraved metal business cards, color aluminum alloy business cards, aluminum alloy file folders
• Equipment nameplates, machine rating plates, license plate raw materials
• Lithographic printing base sheets, advertising billboard panels, wall logo signs

5.2 Architectural & Decoration Engineering

• Exterior curtain wall panels, interior wall decorative panels, aluminum plastic composite panels, fireproof aluminum panels
• Ceiling aluminum sheets, elevator cabin lining, bridge expansion joint aluminum plates
• Hotel, mall, office building, villa interior decorative veneers, furniture cabinet panels

5.3 Refrigeration & Household Appliance

• Chest freezer, refrigerator, wine cabinet, tea cabinet inner lining embossed anodized coils
• Water-contact small household appliance corrosion-resistant panels, lamp housing, air conditioner decorative frames
• Mailboxes, storage cabinet panels, kitchen hardware decorative parts

5.4 Electronic & Communication Equipment

• LED circuit aluminum substrates, aluminum-based copper clad laminates
• LED power supply housings, communication equipment casings, server racks, electrical control panels
• Consumer electronics shells: notebook, audio, digital peripheral metal frames

5.5 Transportation & Rail Transit

• High-speed rail, subway cable trays and cable trench cover plates
• Automobile interior & exterior decorative trim, vehicle anti-slip tread plates
• Aircraft lightweight precision aluminum structural parts

5.6 Machinery, Instruments & Handicrafts

• Precision instrument housings, radio & electronic equipment components
• General mechanical wear-resistant parts, hardware equipment casings
• Metal craft ornaments, decorative aluminum art panels

6. TMR AL Product Supporting Services

• Custom alloy, thickness, width, film thickness, color and surface texture according to customer drawings
• Secondary processing support: laser engraving, UV silk printing, stamping, bending, slitting, cutting, embossing
• Complete inspection before delivery: film thickness test, salt spray corrosion test, hardness test, color difference detection
• Stable bulk supply for engineering, factory mass production and retail customization orders
• Technical consultation: professional scheme matching for different industry usage environments (indoor/outdoor, wear-resistant, anti-corrosion, low-temperature)

7. Quality Compliance Standards

Our anodized aluminum products comply with international mainstream standards:

• ISO 7599 (General specification for anodic oxidation coatings on aluminum)
• EN 12373 (European architectural aluminum anodizing standard)
• AAMA 611 (American architectural exterior anodizing color stability standard)
• ASTM B117 (Neutral salt spray corrosion test standard)

All batches provide test reports of film thickness, salt spray resistance and color difference to support engineering bidding and export customs clearance.