How to Choose Corrosion-Proof Coatings for Steel Structures?

The "Triple剑客" combination showcases its prowess in the steel structure anticorrosion field, along with innovative coatings such as epoxy zinc-rich primer and epoxy iron oxide intermediate coat.Acrylic AcidPolyurethane (or fluorocarbon) topcoats form a classic protective system, proven over decades in large-scale projects.​

Epoxy zinc-rich primer serves as the first line of defense, containing over 70% zinc content. The zinc powder forms a conductive network, acting as a "bodyguard" for the steel surface by protecting it through sacrificial anodes. When the steel surface has minor damage, the zinc powder undergoes oxidation first, forming a dense zinc oxide layer to block the corrosion medium from entering. It is particularly suitable for long-lasting protection of substrates like bridges and storage tanks, maintaining over 5 years of electrochemical protection in high dust industrial environments.​

The intermediate layer of epoxy iron oxide mica paint, constructed with lamellar iron oxide, forms a physical barrier like a "tough armor" layer by layer, blocking moisture and salt penetration. Its unique lamellar structure extends the penetration path of corrosive mediums by 3-5 times, while enhancing adhesion with the layers above and below, increasing the overall coating thickness to 150-200μm. In steel structure factories in coastal humid areas, it effectively delays the blistering and peeling of the coating.​

Surface Paint SelectionAcrylic AcidPolyurethane or fluorocarbon paint. The former boasts excellent weather resistance, showing no significant fading after 5 years of outdoor exposure, with a光泽 retention rate of over 80%, making it ideal for the exterior decoration of city landmarks. The latter excels in resistance to acids and alkalis, and offers superior UV protection, maintaining its shine for over 15 years in coastal high-humidity environments, making it the perfect choice for facilities like port cranes and offshore platforms, and is known as the "face" of the system.​

New TypeSpecialty Cyanide Gel Waterproof and Anticorrosive CoatingBreaking the traditional mold, this product features a one-piece bottom. Designed for two-component coatings, it must be mixed in specific ratios before use. It is a rigid coating that, upon curing, forms a hard protective layer with a compressive strength exceeding 20MPa, capable of withstanding certain external force impacts. Although the process requires component mixing, the operational procedure is not complex. The triple-cyanogen chloride coating has a thickness of around 300 micrometers, excels in damp environments such as underground pipelines and sewage treatment pools, providing both waterproofing and corrosion resistance. It achieves the effects of a conventional three-layer system while allowing a single-pass application thickness of up to 100μm, reducing the construction period by 40%, making it an efficient choice for small-scale projects.​

These coatings, from division to integration, construct protective barriers through various mechanisms, providing comprehensive protection for the safety and lifespan of steel structures.