Applications and Features of anodized aluminum tread plates :
1. Excellent Corrosion Resistance. The corrosion resistance of  aluminium chequered plate is unmatched by many tread metal sheets, so it can be applied to extremely humid environments such as ships, carriages, and open air.

2. Amazing Surface Treatment Effect. The surface of  five bar aluminum alloy tread plate treated by roller printing shows a very clear pattern line, wear-resistant and non-slip, the decorative effect is so amazing !

3. Bearing Strength. The strength of  aluminium chequered plate is higher. This high strength makes Grade very suitable for aluminum chequer plate flooring applications.

 

Color: red black gold silver aluminum or customed

Alloy: 1050 1060 3003 1100 5052 6061 5754 etc

Anodization thickness:1-25 um

 

Welcome your inquiry!

 

Anodizing Process of Aluminum Coil & Performance Advantages

Aluminum coils are indispensable core materials in architectural decoration, industrial manufacturing and outdoor engineering. However, the natural oxide film on the aluminum surface is thin and unstable, failing to provide long‑lasting anti‑corrosion protection and decorative effects. As a mature and high‑efficiency surface treatment technology, continuous aluminum coil anodizing can form a dense, firmly bonded artificial oxide layer on the aluminum substrate. This article comprehensively elaborates on the complete technological process, working principle, film thickness standards and core advantages of aluminum coil anodizing, providing professional reference for engineering selection and processing production.

1. Working Principle of Aluminum Coil Anodizing

Standard operating parameters for conventional anodizing:

• Voltage: 20‑30 V
• Current density: 10‑15 A/dm²

The formed oxide film has a dual‑layer structure: a thin and dense inner barrier layer and a thick porous outer layer, with a pore density of up to 100 million pores per square millimeter. This unique porous structure lays a solid foundation for subsequent uniform dyeing and hole‑sealing treatment. Notably, the anodized film is perfectly integrated with the aluminum base material — 1/3 of the film layer grows outward, and 2/3 penetrates inward into the substrate, ensuring ultra‑high bonding strength without peeling or falling off.

2. Complete Continuous Anodizing Technological Process

The full set of continuous anodizing production line is about 220 meters long, realizing automated and streamlined processing from raw material pretreatment to finished product sealing. The whole process is divided into four core stages: pretreatment, anodizing, coloring and sealing, with strict multi‑stage rinsing to ensure no impurity residue and stable product quality.

2.1 Pretreatment: Foundation for High‑Quality Oxide Film

Pretreatment is the key link to remove surface oil, oxide scale and impurities, avoiding defects such as uneven film layer and color difference in subsequent processing. The standard process is as follows:

• Cleaning: Adopt mild alkaline solution for degreasing treatment at room temperature or above, matched with 2‑cycle circulating rinsing to completely remove surface oil and dust.
• Etching: Use sodium hydroxide solution with stabilizers for surface etching to remove natural oxide films and burrs, followed by 3‑cycle rinsing.
• Acid Pickling & Neutralization: Adopt mixed sulfuric‑nitric acid for neutralization treatment to eliminate residual alkaline substances, with 3‑cycle rinsing to ensure surface acidity balance.

After pretreatment, professional surface inspection is required to screen out visual defects, mechanical damage and metallurgical flaws to ensure qualified raw materials enter the anodizing stage.

2.2 Core Anodizing Treatment

After qualified pretreatment, the aluminum coil enters the electrolytic tank for anodizing film formation. The core process conditions are strictly controlled:

• Electrolyte: High‑purity sulfuric acid solution
• Temperature: Constant temperature above room temperature (equipped with cooling system for temperature adjustment according to production needs)
• Power supply: Stable DC power supply
• Cathode: Special aluminum‑based cathode
• Post‑treatment: 3‑cycle precise rinsing to remove residual electrolyte on the surface

Through standardized electrolysis reaction, a uniform and dense porous Al₂O₃ protective film is stably formed on the surface of the aluminum coil.

2.3 Coloring & Sealing: Final Quality Enhancement

The porous structure of the anodized film can fully adsorb color dyes, realizing rich and uniform color decoration. After coloring, the sealing process is carried out immediately: the porous aluminum oxide reacts with water to form hydrated aluminum oxide (Al₂O₃·H₂O), which completely seals the surface micropores.

Sealing treatment can lock the color permanently, effectively prevent surface oxidation and corrosion, and greatly improve the weather resistance and stain resistance of the aluminum coil.

Complete Process Flow Summary: Cleaning → Etching → Acid Pickling → Anodizing (Oxide Film Formation) → Coloring → Sealing

3. Standardized Anodizing Film Thickness for Different Application Scenarios

The anodized film thickness directly determines the corrosion resistance and service life of the aluminum coil. We formulate targeted minimum film thickness standards for different usage environments to balance cost and performance:

Grade	Film Thickness (μm)	Applicable Scenarios
10	10 μm	Indoor decoration, dry‑bonded interior materials, low‑corrosion indoor environment
15	15 μm	General indoor materials, partial wet‑bonded scenes, suburban non‑polluted atmospheric environment
20	20 μm	Building exterior wall cladding, urban conventional atmospheric environment, general industrial facilities
25	25 μm	High‑corrosion environments, heavy‑pollution industrial zones, coastal salt‑fog areas

4. Core Advantages of Anodized Aluminum Coil

Compared with ordinary untreated aluminum coils and other surface treatment processes, continuous anodizing technology has irreplaceable comprehensive advantages:

• Superior Corrosion Resistance: The dense integrated oxide film isolates air and moisture, effectively resisting atmospheric oxidation, acid‑base corrosion and salt‑fog erosion, with a service life several times that of ordinary aluminum materials.
• Excellent Decorative Performance: The uniform porous structure ensures full and even dye adsorption, with rich color options, high color fastness, no fading or color difference for long‑term use.
• Ultra‑High Bonding Strength: The oxide film grows integrally with the aluminum substrate, without coating falling off, peeling or blistering, with stable physical and chemical properties.
• Customized & Targeted: The film thickness can be flexibly customized according to indoor and outdoor usage environments and corrosion levels, meeting the differentiated needs of decoration, construction and industrial fields.

As a professional and mature surface strengthening process, aluminum coil anodizing realizes dual upgrading of protective performance and decorative effect through standardized and streamlined technological processes. With stable quality, strong durability and wide applicability, it has become the preferred surface treatment solution for high‑end architectural decoration and industrial aluminum materials.