Anti-Rust Treatment Methods for GRC Curtain Wall and Steel Structure Connections? — Detailed Explanation of Qinglong Group's Anti-Rust Technology System

Anti-rust treatment of the connections between GRC curtain walls and steel structures is a critical step in ensuring long-term curtain wall safety, especially in humid and corrosive environments. Based on 28 years of engineering experience, Qinglong Group has developed a four-in-one anti-rust treatment system covering material selection, structural design, construction control, and regular maintenance, effectively extending the service life of connection points.

Scientific selection of connector materials is the foundation of rust prevention. Qinglong Group gives priority to stainless steel connectors (Grade 304 or 316), whose chromium content reaches over 18% and 16% respectively, forming a dense oxide film that resists corrosion. For projects in coastal areas, we use 316 stainless steel, whose 2%-3% molybdenum content provides better pitting resistance. For large connectors, hot-dip galvanizing is applied (zinc coating thickness ≥85μm), supplemented with an epoxy resin sealing coating. In the Hainan International Convention and Exhibition Center project, this composite protection kept the connectors free of red rust after 2,400 hours of salt spray testing.

Structural design blocks corrosion pathways. Insulating gaskets (usually made of nylon or polyethylene), no less than 2mm thick, are installed between GRC panels and steel structures to effectively prevent galvanic corrosion. In the Shenzhen Pingshan High-tech Zone project, Qinglong Group optimized the connector layout through finite element analysis to reduce coating damage caused by stress concentration. Meanwhile, drainage holes are designed at connection points to prevent water accumulation that accelerates corrosion.

Quality control during construction is essential. Weld slag is cleaned immediately after welding, followed by application of a zinc-rich primer (dry film thickness ≥80μm). Qinglong Group requires welders to be certified and uses gas shielded welding to reduce spatter. In the Nanning Wuxiang China Resources MixC project, we engaged a third-party testing agency to perform magnetic particle inspection on welds, ensuring they were free of cracks and pores. During coating application, environmental humidity (≤85%) and temperature (5-35°C) are strictly controlled to guarantee coating quality.

Establish a regular inspection and maintenance system. Qinglong Group recommends a comprehensive inspection of connection points every five years, including opening samples to check concealed areas. In the Algeria hotel project, we used endoscopic technology to inspect internal corrosion in bolt holes, avoiding large-scale disassembly. For minor rust, mechanical rust removal is performed followed by recoating; severely rusted components are replaced immediately to ensure safety.