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Centrifugal Hot-Dip Galvanizing Line
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Ideal for small metal components; not recommended for large/thin-walled/precision-mating parts (risk of deformation):
● Fasteners: Bolts, nuts, washers, self-tapping screws
● Pipe Fittings: Couplings, elbows, flanges, valve bodies
● Small Structural Parts: Clamps, brackets, chain links
● Electrical Hardware: Cable clamps, suspension hooks, U-bolts
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Comparison Item |
Centrifugal Type |
Hanging Type |
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Suitable Parts |
Small, high-volume |
Large, irregular |
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Thread/Hole Treatment |
Clean, no blockage |
Prone to zinc buildup; manual cleaning needed |
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Coating Uniformity |
Good (centrifugal control) |
Excellent (free-hanging) |
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Labor Cost |
Low (high automation) |
High (manual operations) |
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Production Efficiency |
High (100s kg/hour) |
Moderate-low (slow cycles) |
● Zinc kettle capacity: 1–10 tons; Operating temperature: ~450°C (adjustable)
● Centrifuge speed: 800–2500 rpm (stepless variable); Load per basket: 20–150 kg
● Cycle time: 60–180s/basket; Control system: PLC + HMI
● Coating thickness: 20–80 μm (adjustable)
● Power T&D: Grounding clamps, electrical connectors (weather-resistant)
● Construction: Fasteners, brackets (long-term corrosion protection)
● Automotive: Small underbody/engine components
● Petrochemical: Valves, couplings (corrosive environment resistance)
● Agricultural Machinery: Small parts (cost-effective durability)
With high efficiency, reliability and eco-compliance, it’s the preferred corrosion protection solution for small parts, enabling high-quality, low-cost smart production.
Pretreatment Enclosed Room
A dedicated enclosed equipment for the pretreatment process of hot-dip galvanizing production lines. It provides a clean and environmentally friendly environment for component degreasing, pickling and other processes, isolating impurities to prevent secondary pollution, collecting and treating harmful gases, accurately controlling process parameters, and centrally recycling waste liquid, ensuring pretreatment quality and production environmental protection, and adapting to different production line needs.
The robotic arm
The robotic arm in a centrifugal galvanizing production line is a key component for automated operation. It automatically picks up and transfers work baskets—loaded with parts—through successive process stations, including degreasing, pickling, fluxing, hot-dip galvanizing, centrifugal spinning, and cooling.
Typically constructed from corrosion- and heat-resistant materials (such as stainless steel or coated structural components), the arm is equipped with specialized grippers to ensure secure and stable handling of baskets throughout the process. Its movements are controlled by a PLC system, executing pre-programmed cycles with precise lifting, horizontal travel, and rotation capabilities for accurate and smooth positioning.
By integrating a robotic arm, the production line significantly reduces manual labor, enhances operational safety, ensures process consistency, and improves overall efficiency—making it an essential element in the modernization and intelligent upgrade of centrifugal galvanizing systems.
Core Process Flow
Degreasing, pickling, rinsing and fluxing to remove oils/oxides for optimal zinc adhesion.
Preheat to 200–300°C to prevent splashing/thermal shock and reduce zinc consumption.
Immerse in ~450°C molten zinc for 10–60s, forming a dense Fe-Zn alloy layer + pure zinc coating.
Defining step—spin at 800–2500 rpm post-zinc bath to expel excess zinc from threads/blind holes, controlling coating thickness and preserving dimensions.
Air/water cooling to solidify coating; optional passivation/oiling to prevent white rust.
Finished parts conveyed to collection bins for inspection/packaging.
Key Technical Features
Handles 10–100+ kg per cycle, suitable for high-volume standardized production.
Centrifugal force ensures uniform coating without clogging, meeting fastener dimensional tolerances.
PLC + HMI control for parameter setting/monitoring; supports data logging and fault diagnostics.
Insulated zinc kettle reduces energy loss; fume filtration and flux regeneration align with green standards.
Single/multi-station setups; integrable with pretreatment/packaging lines for smart manufacturing.
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