What is colored coated aluminum plate？

In many fields such as architectural decoration, home appliance manufacturing, and transportation, a material that combines beauty and practicality is gradually emerging, which is colored coated aluminum plate. This material has received widespread attention in the market due to its unique appearance and excellent performance. So, what exactly is colored coated aluminum plate, and what are its characteristics and advantages?

1. Core components: synergy between aluminum substrate and coating

The substrate for colored coated aluminum plates is usually made of aluminum manganese alloys such as 3003 and 5052, or aluminum magnesium alloys with a thickness range of 0.2-1.5mm. These alloys have excellent corrosion resistance (salt spray test ≥ 1000 hours) and processing performance, and can meet complex forming requirements such as stamping and bending. The surface coating consists of three layers: primer, topcoat, and clear coat. The primer is made of epoxy resin and has an adhesion strength of level 1 (GB/T 1720-1979); The topcoat is mainly made of polyester or fluorocarbon resin, and its weather resistance (QUV accelerated aging test) can reach more than 5000 hours; The varnish layer enhances the surface glossiness (60 ° angle gloss value ≥ 80).

2. Key process: Conversion from substrate to finished product

1. Pre treatment: Hexavalent chromium conversion film treatment (Cr ⁶⁺ content<0.1g/m ²) is used to form a chemical conversion layer of 1-3 μ m, which enhances the adhesion of the coating.
2. Coating: Use roll coating technology to control the coating thickness at 15-25 μ m (dry film), and achieve coating uniformity (film thickness deviation ± 2 μ m) through three roll reverse coating technology.

3. Curing: Cure in an oven at 230-250 ℃ for 10-15 seconds to achieve a cross-linking degree of over 90%, ensuring hardness (pencil hardness ≥ 2H) and solvent resistance (MEK wiping>100 times).

3. Performance advantage: unity of functionality and decoration

1. Corrosion resistance: After passing the neutral salt spray test (NSS) for 1000 hours without foaming or peeling, the lifespan of the uncoated colored coated aluminum plate is increased by 3-5 times.
2. Decorative: It can achieve more than 2000 color effects such as metallic color, solid color, and imitation wood grain, with a color fastness (ISO 105-B02) of 4-5 levels.
3. Processability: Can withstand 180 ° bending (R=0t) without cracks, suitable for complex shaped building components.

4. Environmental friendliness: Compliant with ROHS directive, VOC emissions<50g/m ², reduced by 80% compared to traditional solvent based coatings.

4. Typical application: Value embodiment in multiple fields

1. In the field of architecture: used for curtain wall systems in airport terminals and sports venues, such as Beijing Daxing Airport, which uses fluorocarbon colored coated aluminum plates with no fading for 20 years.
2. Home appliance industry: Polyester colored coated aluminum plates are used for refrigerator and air conditioner casings, which enhance product texture with fingerprint resistance (droplet angle>90 °).
3. Transportation vehicles: The interior panels of subway cars are coated with flame-retardant coatings (oxygen index ≥ 32%) to meet fire safety requirements.
4. Lighting fixtures: The reflector is made of high gloss colored coated aluminum plate, with a reflectivity of 92%, which is 15% higher than ordinary aluminum plate.
With the continuous advancement of technology and the increasing market demand, the application fields of colored coated aluminum plates are constantly expanding. From traditional architectural decoration to emerging fields such as new energy vehicles and electronic information, colored coated aluminum plates have shown tremendous development potential. In the future, with the continuous improvement of material properties and continuous innovation of processing technology, colored coated aluminum plates will play an important role in more fields, adding more brilliant colors to our lives.