1. Basic service life range
Regular service life
Untreated aluminum corrugated sheet (such as pure aluminum or low alloy models) has a service life of about 20 years in general environment, mainly relying on the natural oxide film of aluminum to resist corrosion.
Surface treated Aluminum Corrugated Sheet Roof (such as fluorocarbon coating, rare earth passivation layer) can increase its service life to 30–50 years, and can still maintain stable performance in highly corrosive environments.
High specification product life
Aluminum Corrugated Sheet Roof made of aluminum-magnesium-manganese alloy (such as 5754/3003) with a thickness of ≥1.5mm, combined with enhanced surface technology (such as high-temperature baking varnish, nano coating), can have a service life of 60–120 years;
Special composite materials such as zinc-magnesium-aluminum corrugated steel sheet (such as for prefabricated water tanks) can have a service life of more than 50 years in a stable climate.
2.Influencing Factors & Optimization Measures for Aluminum Plates
| Influencing Factors | Specific Manifestations | Optimization Plan |
|---|---|---|
| Alloy Composition | 1-series: best corrosion resistance, low strength; 5-series (e.g., 5052): balanced properties; 7-series (e.g., 7050): high strength, low corrosion resistance | Prefer aluminum-magnesium-manganese alloys (5-series) for optimal performance |
| Surface Treatment Process | Fluorocarbon coating extends service life up to 25 years; rare earth passivation keeps annual corrosion rate ≤0.015mm, even in harsh environments | Use multi-layer protective coatings or apply anodizing treatment |
| Thickness & Corrugated Structure | YX35-125-750 with ≥2mm thickness offers over 30% better deformation resistance and longer service life compared to 1mm plates | Choose high-strength corrugated models and thicker plates for large-span or high-load scenarios |
| Installation Environment | Salt spray/polluted areas (coastal, industrial) accelerate corrosion; dry/mountainous areas yield longer durability | Apply sealant; ensure regular cleaning and maintenance |
3.Comparison of service life in typical application scenarios
Building roof/curtain wall
Civil building (moderately corrosive environment): about 40–60 years (requires fluorocarbon coating + regular maintenance);
Industrial plant (high temperature and high humidity): about 25–30 years (recommended to have supporting insulation layer and drainage system).
Special project
Photovoltaic bracket substrate: life needs to match photovoltaic modules (≥25 years), 2.5mm thick aluminum-magnesium-manganese alloy corrugated plate is recommended;
Reservoir/chemical plant: zinc-magnesium-aluminum composite plate is used, with a design life of 30–50 years.
Note: The recycling rate of aluminum corrugated plate waste is as high as 80–99.99%, and the long-term cost performance is significantly higher than that of color steel tiles. When purchasing, you need to pay attention to the third-party test report (such as salt spray test ≥3000 hours) and warranty terms
