In building fire protection systems,steel fire doors serve as crucial fire-resistant partitions,and their durability and maintenance costs directly impact user experience and safety.Steel fire doors employing electrostatic spraying technology,through optimized coating structure and material selection,achieve five years of maintenance-free corrosion resistance in indoor environments,making them the preferred solution for public buildings and residential projects.
Electrostatic Spraying:The”Precise Adhesion Technique”for Anti-corrosion Coatings.Electrostatic spraying utilizes a high-voltage electrostatic field to charge powder coating particles,which then adhere to the steel door surface and are cured at high temperatures to form a dense coating.Compared to traditional spray painting processes,its advantages are significant:
Coating Uniformity:Under the influence of an electric field,powder particles evenly cover all corners of the door,especially areas prone to dust accumulation such as door frame corners and door closer mounting holes.Coating thickness deviation is≤0.05mm,preventing corrosion caused by localized thin coatings;
Enhanced Adhesion:The coating bonds tightly to the cold-rolled steel substrate through intermolecular forces.Cross-cut adhesion testing shows that the coating peeling area is<5%,far exceeding the national standard limit of 15%;
Improved Environmental Friendliness:Powder coating utilization reaches over 95%,and oversprayed powder can be recycled and reused,reducing volatile organic compound(VOC)emissions and meeting green building requirements.
Five-Year Corrosion Protection:Dual Guarantee of Materials and Processes
The core of achieving five years of maintenance-free operation lies in the weather-resistant design of the coating system:
Primer Rust Prevention:Utilizing an epoxy zinc-rich primer with a zinc content≥80%,it delays corrosion of steel substrates through sacrificial anode protection.
Topcoat Weather Resistance:The polyester powder topcoat incorporates UV absorbers,maintaining its color for 10 years under indoor lighting conditions and resisting acid and alkali corrosion,making it suitable for humid environments such as kitchens and bathrooms.
Thickness Control:The total coating thickness is≥80μm,with the topcoat accounting for 60%,ensuring coating abrasion resistance.After 500 cycles of rubber friction testing,there is no bare substrate.
Application Scenarios:From Public Areas to Residential Spaces
Commercial Buildings:Fire doors for evacuation routes in shopping malls and office buildings,offering outstanding abrasion resistance in high-traffic environments.
Residential Projects:Fire doors for elevator lobbies and pipe shafts,reducing property maintenance costs due to the five-year maintenance-free feature.
Industrial Plants:Fire doors for equipment rooms,with a chemically resistant coating adaptable to complex working conditions.
Steel fire doors achieve”five years of corrosion protection and maintenance-free operation”through electrostatic spraying,providing a sustainable solution for building fire safety with the advantages of low cost and long life.