It’s not just "galvanized", but "thickly galvanized" – Average hot-dip galvanized layer thickness exceeds industry standards, making the anti-corrosion foundation of spiral ground piles more solid.
Release time:
2025-12-08
Factory control starts with raw materials—we only select Q355 high-strength steel, with each batch inspected for tensile strength and ductility. The fully automated production line realizes precision processing of spiral blades: variable-pitch parameters (140-210mm) are set by computer numerical control, and blade thickness (16mm) is monitored in real time. For our spiral ground piles, anti-corrosion is never just "galvanized"—it’s "thickly galvanized", a core advantage that makes the anti-corrosion foundation more solid. To achieve this, we first upgraded the pretreatment system to a four-stage process: shot blasting for deep derusting (removing rust and oxides up to 0.1mm), alkaline degreasing (eliminating oil stains with food-grade degreaser), acid pickling for oxide removal, and activation treatment. This ensures the pile surface is ultra-smooth, laying a perfect base for thick zinc layer adhesion.
The key to "thickly galvanized" lies in precise process control. We use a 50-ton large-capacity zinc pot with dual intelligent temperature controllers, keeping the zinc liquid at a stable 450±5℃—this constant temperature ensures zinc-iron alloy fully reacts to form a thick coating. The pile body is hoisted by a servo motor system, lifting and lowering at a constant 0.8m/min; slower speed allows more zinc liquid to adhere, while uniform speed avoids uneven thickness. The result? An average hot-dip galvanized layer thickness of 95μm, which not only surpasses the 85μm national standard but also exceeds the 75μm industry average by 26.7%. Every millimeter of this thickness is strictly inspected: 8 random points are tested per pile with ultrasonic thickness gauges (up from 5 in industry practice), and any point below 90μm is directly rejected. This thick zinc layer forms a dense "corrosion barrier"—salt spray testing shows it resists 1200 hours of continuous corrosion, 50% longer than the industry average 800 hours. Even at spiral blade corners and weld joints (easy to have thin layers), we use a 360° rotating spray auxiliary device to ensure thickness reaches 90μm+, with no gaps. Before delivery, each pile undergoes adhesion and pinhole tests; on-site, technicians recheck the anti-corrosion layer to ensure it’s intact.
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