Anti-Rust Treatment Methods and Quality Control Points for GRC Curtain Wall and Steel Structure Connections

In modern building curtain wall projects, the anti-rust treatment of connection joints between GRC curtain walls and steel structures is a critical link in ensuring building safety and durability. As an industry expert with 28 years of experience in detailed design, manufacturing, and construction of UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the significant impact of anti-rust treatment on the full life cycle of curtain wall systems. This article systematically analyzes the anti-rust technical solutions and quality control essentials for GRC curtain wall and steel structure connections, providing a professional reference for designers, owners, and construction units.

The corrosion risk of connection joints between GRC curtain walls and steel structures mainly stems from three aspects: first, condensation accumulation caused by outdoor temperature and humidity changes; second, chloride ion erosion in coastal areas; and third, electrochemical corrosion at the interface between steel and GRC materials. Laboratory data from Qinglong's production base in Nanning shows that untreated connection joints can reach a corrosion depth of 0.3mm within 5 years in a simulated marine climate environment, directly affecting structural load-bearing capacity. Therefore, anti-rust treatment must run through the entire process of design, material selection, construction, and maintenance.

Three-Level Anti-Rust Treatment System for GRC Curtain Wall Steel Structure Connections

Level-one protection focuses on surface preparation, using sandblasting for rust removal up to the Sa2.5 grade standard to ensure the steel structure surface is free of oxide scale, rust, and oil stains. During the detailed design stage, Qinglong selects hot-dip galvanizing (zinc layer thickness ≥85μm) or zinc-rich primer (dry film thickness ≥60μm) as the anti-rust base according to the project's regional environment; the hot-dip galvanizing process achieved a 15-year rust-free record in a commercial complex project in Guangzhou. Level-two protection emphasizes the barrier function of the intermediate coating, using epoxy micaceous iron oxide intermediate paint to form a sealed layer with a thickness ≥120μm, effectively blocking water vapor penetration. Level-three protection uses a fluorocarbon topcoat or polysiloxane topcoat, ensuring a dry film thickness above 60μm while balancing decorative appeal and weather resistance. For more industry information: +WeChat qlfsbl123

Material Matching and Construction Process Control for Connection Joints

The core of anti-rust treatment lies in material compatibility design. Through the practice of 200+ projects, Qinglong's technical team has concluded that an isolation layer must be set between GRC components and steel structures, with 3mm thick chloroprene rubber gaskets or epoxy resin coatings recommended to prevent electrochemical corrosion caused by contact between different metals. At bolted connections, in addition to using stainless steel bolts (316 grade suits coastal environments), graphite grease must be applied to the threads to prevent installation seizing and enhance sealing. During construction, Qinglong strictly implements the "three-inspection system": checking the rust removal grade before each shift, monitoring coating thickness during the shift, and conducting adhesion testing after the shift (pull-off method ≥5MPa), ensuring every process complies with the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018).

Full Life-Cycle Quality Control and Maintenance Strategies

As a national high-tech enterprise, Qinglong has established a full-chain quality control system from detailed design to after-sales maintenance. In the design stage, BIM technology is used to simulate joint stress and corrosion risk areas, optimizing structural details in advance; the production stage uses automated spraying lines to ensure coating uniformity deviation ≤5%; the installation stage uses 3D laser scanning positioning to ensure the precision of connection joints. Most critically, Qinglong has innovatively embedded RFID chips in key joints, enabling real-time monitoring of corrosion development trends through regular scanning. For after-sales maintenance, professional inspection services are provided every 3 years, including coating thickness testing and electrochemical impedance spectroscopy analysis, to promptly identify and address potential corrosion problems. This service system has been successfully applied in a landmark project in Shenzhen, improving the curtain wall structure's durability by 40%. For more industry information: +WeChat qlfsbl123

Anti-rust treatment is the "invisible cornerstone" of GRC curtain wall projects, and its quality directly relates to building safety and aesthetics. With 28 years of professional experience, Qinglong Group has deeply integrated materials science, structural mechanics, and construction technology to form a replicable anti-rust solution. Whether for super high-rise landmarks or coastal buildings, only by choosing a GRC manufacturer with full-chain service capabilities can corrosion risks be fundamentally avoided, achieving the perfect unity of architectural art and engineering quality. In the future, Qinglong will continue to promote anti-rust technology innovation, providing more solid technical support for the mission of "Creating Beautiful Architecture."