1.How does paint type and performance affect service life?
Ordinary decorative paint: It has weak protection and mainly serves the purpose of aesthetics. It can extend the life of the paint by 1-3 years in a dry indoor environment; if it is in a humid or slightly corrosive environment, it may only extend the life by 6 months to 2 years.
Anti-corrosion paint: Contains anti-rust pigments and weather-resistant ingredients, which can extend the life of the paint by 5-15 years in a moderately corrosive environment; it can also extend the life of the paint by 3-10 years in a harsh environment.
Special anti-corrosion paint: It forms electrochemical protection with the metal surface. After matching with topcoat, it can extend the life of the paint by 10-30 years in a highly corrosive environment.
2.How do coating thickness and construction quality affect service life?
Single coating: Even with anticorrosive paint, the life extension effect will be discounted, which may be only 50%-70% of the standard coating.
Multi-layer composite coating: When the thickness reaches 80-200 microns, the protection effect is significantly improved, and the life is extended by 2-3 times compared with the single coating.
Construction defects: It will cause local premature corrosion, and in severe cases, the life extension effect may be halved or even invalid.
3.How does the corrosion intensity of the operating environment affect the service life?
Dry indoor environment (such as indoor furniture and equipment): The life span can be extended by 5-20 years after painting (mainly due to aging of the paint layer rather than corrosion, such as fading and chalking).
Wet/mildly corrosive environment (such as rural outdoor, non-coastal areas): Anti-corrosion paint can extend the life span by 3-10 years, ordinary paint by 1-3 years.
Strongly corrosive environment (such as seaside, acid rain area, industrial area): High-performance anti-corrosion paint is required, otherwise ordinary paint may fail within 1 year, while high-quality coating can extend the life span by 3-15 years.
4.What are the factors that extend lifespan in common scenarios?
Indoor steel structure (dry): paint layer aging resistance (fluorocarbon paint is better)
Outdoor ordinary steel structure (urban): UV resistance and rainwater erosion resistance
Automotive bodies (outdoor use): coating thickness (≥100 microns) and weather resistance
Seaside guardrail (high salt spray): resistance to salt spray and humidity penetration