What is color-coated galvanized steel?
Color-coated galvanized steel coil is a composite material made of galvanized steel coil (hot-dip galvanized or electro-galvanized) as the base material, which is then coated with high-performance coatings (polyester, fluorocarbon, silicon modification, etc.) after surface chemical treatment (such as passivation and phosphating) and cured at high temperature.
What is the structure of galvanized steel sheet?
|
Number of layers |
Materials/Processes |
Function |
|
Substrate |
Cold-rolled steel plate |
Provide strength and formability (such as DC01, S350GD, etc.) |
|
Plating |
Hot-dip galvanized (Z) or electro-galvanized (ZE) |
Anti-rust protection (zinc layer thickness is usually 10-275g/m²) |
|
Coating |
Polyester (PE), fluorocarbon (PVDF), etc. |
Decoration + additional protection (weather resistance, corrosion resistance, self-cleaning, etc.) |
Which is better, galvanized steel or color-coated galvanized steel?
Performance comparison between the two
|
Performance |
Galvanized steel |
Color-coated galvanized steel |
|
Rust-proof life |
5-15 years (depending on the thickness of the zinc layer) |
15-30 years (dual protection of coating + zinc layer) |
|
Maintenance cost |
Requires regular inspection and repainting (exposed zinc layer will oxidize) |
Maintenance-free (high-quality coating is self-cleaning and aging-resistant) |
|
Environmental protection |
Recyclable, but the galvanizing process is highly polluting |
Recyclable, some coatings contain VOCs (environmentally friendly coatings must be selected) |
|
Easy installation |
Requires subsequent spraying (if aesthetics are required) |
Direct installation, no secondary treatment required |
The choice between galvanized steel and color-coated galvanized steel depends on the specific application scenario and requirements
Galvanized steel: economical and practical, suitable for concealed projects/short-term anti-rust needs;
color-coated galvanized steel: all-rounder, suitable for long-term outdoor use + scenarios with high decorative requirements.
Color-coated galvanized steel sheets are used for?
(1) Construction
Roof/exterior wall: steel structure factory, stadium, commercial complex
Decorative enclosure: antique tile, curtain wall, canopy
Interior decoration: suspended ceiling, partition, elevator car
(2) Home appliances and transportation
Home appliances: refrigerator, air conditioner, washing machine shell
Automobile: RV body, new energy battery box cover
(3) Industry and agriculture
Cold storage/cold chain: insulation sandwich panel (polyurethane filling)
Greenhouse: corrosion-resistant aluminum zinc substrate
Application of color-coated galvanized steel
Long-term outdoor exposure:
Building roofs/exterior walls (PVDF coating has a weather resistance of 20 years)
Billboards, traffic facilities (requires long-lasting color)
High decorative requirements:
Commercial complex curtain walls, villa roofs (antique tile effect)
