What Protection Do GRC Exterior Walls in Acid Rain Regions Need? A Complete Anti-Acid Corrosion Solution

GRC exterior walls in acid rain areas (pH≤5.6) require triple reinforcement through "material modification, surface protection, and follow-up maintenance." The core goal is to resist hydrogen ion erosion from acid rain and avoid surface powdering and strength degradation. Through acid-resistant formulations and long-lasting protection, Qinglong extends the service life of GRC exterior walls in acid rain areas to over 20 years, with projects in Guizhou and Ningbo, Zhejiang, all performing excellently.

1. Material Modification: Enhancing Internal Acid Resistance

Optimizing material formulations is the foundation of acid resistance. Cement selection: low-alkali sulphoaluminate cement (alkali content ≤0.6%) is used, offering better acid corrosion resistance than ordinary cement; Qinglong cement retains ≥90% of its strength after 30 days of immersion in acid resistance tests. Aggregate upgrade: high-purity quartz sand (SiO₂ content ≥98%) is used for strong acid resistance; Qinglong aggregates have a mud content ≤0.3%, reducing acid erosion carriers. Acid-resistant admixtures: 5-8% silica fume plus nano silicon dioxide is added to form dense hydration products; Qinglong admixtures reduce internal GRC porosity by 20% and increase acid penetration resistance by 40%. Fiber protection: alkali-resistant glass fibers are surface-coated with an acid-resistant coating; Qinglong fibers have an acid resistance retention rate ≥85%, with no breakage after acid erosion.

2. Surface Protection: Building an Acid-Resistant Barrier

Surface treatment blocks acid rain erosion pathways. Acid-resistant coating: fluorocarbon paint or special acid-resistant coating (thickness ≥50μm) is applied; Qinglong fluorocarbon paint has a fluorine content ≥25% and resists acid corrosion for over 10 years. Silane impregnation agent: penetration depth ≥3mm forms a hydrophobic layer on the surface; Qinglong silane impregnation agent reduces surface water absorption by 60%, making it difficult for acid rain to penetrate. Sealing treatment: acid-resistant sealant is used at panel joints and nodes to prevent acid rain from seeping through gaps; Qinglong acid-resistant sealant shows no aging after 1,000 hours of acid immersion. Surface polishing: polished with diamond grinding pads of 1,000 grit or higher to form a dense glassy layer; after Qinglong polishing, surface hardness reaches 5.5H and acid erosion resistance is improved by 30%.

3. Follow-up Maintenance and Qinglong Project Practice

Regular maintenance extends the effective life of acid resistance. Cleaning frequency: clean once every 3-6 months to remove acidic deposits from the surface; Qinglong cleaning uses neutral detergents to avoid secondary corrosion. Regular protection: apply acid-resistant protective agent once every 2-3 years; Qinglong protective agents continuously strengthen acid resistance. Damage repair: when surface powdering or scratches are found, repair promptly with acid-resistant repair agent; Qinglong repair agents match the acid resistance of the original panels. Project cases: a municipal project in Guizhou (with frequent acid rain), using Qinglong's acid-resistant solution, has shown no surface powdering after 8 years of use, with a strength retention rate of 92%; the landscape GRC components supporting the Ningbo International Convention Center in Zhejiang, after acid-resistant treatment, have endured 5 years of acid rain erosion with no degradation in appearance or performance, earning recognition from the local construction authority.