In the fields of architectural decoration, industrial manufacturing, cold chain insulation, outdoor engineering and other fields, aluminum coils are lightweight metal materials that are widely used. The mainstream aluminum coils on the market are mainly divided into two types: color-coated aluminum coils and rolled plain aluminum coils.
The base materials of the two are the same, but their properties are different. There is a big gap in the adaptation scenarios. Reasonable selection can effectively control costs and improve the service life of the project.
1. Core essential differences
The base materials of the two aluminum coils are high-purity aluminum alloy coils such as 1060, 3003, and 5052. The basic aluminum properties are exactly the same, and the differences in performance and appearance all come from the post-surface treatment process.
Rolled plain aluminum coil: directly formed from aluminum ingots through hot rolling and cold rolling without any post-processing such as spraying, coating, coloring, etc., retaining the original silver-white rolling surface of the aluminum material with subtle native texture. The production is only physical processing without chemical coating. It is the most basic raw material of original ecological aluminum coil.
Color-coated aluminum coil: Using plain aluminum coil as the base material, after degreasing, pickling, and passivation pretreatment, special coatings such as polyester (PE) and fluorocarbon (PVDF) are evenly sprayed through the roller coating process, and then solidified at high temperature to form. The core upgrade is to form a dense organic protective coating on the surface, which has both anti-corrosion protection and personalized decorative effects.
2. Comparison of six core dimensions
1. Appearance and texture
The mill finish aluminum coil has a uniform silver-white metallic primary color, and the original fine lines on the surface are clearly visible. It is non-decorative and has no covering power. Minor flaws in the base material will be directly exposed. It is only suitable for functional scenes without appearance requirements.
Color-coated aluminum coils are extremely malleable and can be customized with various textures such as solid color, matte, high-gloss, wood grain, stone grain, frosted, etc. The paint film is uniform and smooth, with excellent hiding properties. It can perfectly cover the defects of the base material and is visually neat and high-end. It can meet the appearance needs of various high-end decoration scenes.
2. Anti-corrosion and weather resistance
Aluminum has its own natural thin oxide film and has basic anti-rust capabilities, but there is a significant gap in protection levels between the two. Plain aluminum coils only rely on natural oxide layer protection and have limited corrosion resistance. They are only suitable for dry indoor room temperature environments. They are prone to oxidation and blackening and white spots when exposed to the sun outdoors, humid and rainy, coastal salt spray, and acid-base industrial environments. Long-term use in the open air will cause rapid aging.
Color-coated aluminum coils adopt the dual protection of "aluminum substrate + organic coating". The pre-treatment layer seals the pores of the substrate, and the surface coating isolates air, moisture, ultraviolet rays and acid and alkali corrosion. Among them, fluorocarbon color-coated aluminum coils are extremely resistant to aging and corrosion. They can still retain more than 95% of their protective properties after 15 years of use in coastal environments, and their weather resistance far exceeds that of plain aluminum coils.
3. Processing performance
Both have the same base material and consistent mechanical properties. They both have the advantages of being lightweight, good toughness, easy to cut, bend, and stamping, and are suitable for most construction and industrial processing techniques.
The subtle difference is that the coating of color-coated aluminum coils has strong adhesion and is not easy to peel off during conventional bending processing, but deep drawing and repeated bending require an adapted coating process; plain aluminum coils are not bound by coatings, have higher processing error tolerance, and no risk of peeling off, and are more suitable for precision components and deep forming processing.
4. Service life
The service life of plain aluminum coils is 10-15 years in a dry indoor environment. However, if it is exposed to outdoor, humid, and corrosive environments, oxidative discoloration, surface blooming, and protective performance will continue to decline in 3-5 years, requiring regular maintenance.
The conventional outdoor service life of polyester color-coated aluminum coils is 10-15 years, and the service life of high-end fluorocarbon color-coated aluminum coils can be more than 20 years. There is no need for frequent maintenance throughout the process and the performance is extremely stable.
5. Cost price
The production process of plain aluminum coils is simple, there is no coating process cost, and the unit price is lower. The cost-effective advantages are concentrated in short-term, temporary, and hidden projects.
The single purchase price of color-coated aluminum coils is higher due to the additional painting, curing and other processes. However, with the advantages of ultra-long life, maintenance-free, and corrosion resistance, it greatly reduces the cost of later maintenance, renovation, and replacement, and has a better overall cost performance for long-term outdoor and permanent projects.
6. Applicable scenarios
Plain aluminum coils focus on functionality and low cost, and are suitable for pipe insulation, equipment linings, industrial heat dissipation components, packaging base materials, indoor hidden steel structure protection, ordinary mechanical accessories and other scenarios with mild working conditions and no need for decoration.
Color-coated aluminum coils are both decorative and durable and are widely used in open-air, high-beauty and high-durability scenarios such as building roofs, exterior curtain walls, indoor ceilings, integrated thermal insulation panels, outdoor billboards, transportation facilities, photovoltaic roofs, and high-end home appliance casings. Specially customized models can also achieve special functions such as flame retardant, antibacterial, and easy cleaning. If you look for a reliable painted aluminum coil supplier, Haomei Aluminum is a good choice.