Wedone Group offers turnkey hot-dip galvanizing plants and automated solutions

WEDONE enclosed pretreatment system for hot-dip galvanizing lines

Acid-resistant enclosed pickling area with automatic material handling system

Enclosed galvanizing pretreatment system connected to acid mist extraction equipment

Enclosed Pretreatment System for Hot-Dip Galvanizing WEDONE

Contained Pickling and Automated Material Handling for Cleaner Galvanizing Operations

The WEDONE Enclosed Pretreatment System contains the cleaning, pickling, rinsing and fluxing processes within an acid-resistant enclosure. Controlled extraction maintains negative pressure inside the enclosure, helping prevent acid mist from escaping into the workshop.

• Acid-resistant construction with a heavy-duty steel structure
• Negative-pressure control for effective acid mist containment
• Compatible with automatic cranes and RGV material handling systems
• Sealed roof openings help protect hoist drives from corrosive fumes
• Automated doors and material-transfer controls
• Custom-designed for the tank arrangement, production process and workshop layout
• Helps improve worker safety, workshop cleanliness and environmental compliance

The system can be integrated with an acid gas scrubber, chemical tank management system and PLC controls to provide a coordinated pretreatment solution.

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Key Advantages

High-Quality Surface Preparation: Ensures optimal adhesion for zinc coating.

Fully Enclosed Design: Prevents chemical and fume leakage, enhancing workplace safety.

Energy and Chemical Efficiency: Optimized recirculation and dosing systems reduce consumption.

Durable Construction: Built from corrosion-resistant materials suitable for acidic and alkaline solutions.

Environmental Compliance: Integrated waste treatment and ventilation systems meet international standards.

Typical Technical Parameters

Steel Width	Up to 2,500 mm (customizable)
Operating Temperature	40–90°C (pickling/fluxing baths)
Material	Stainless steel, FRP, or coated steel
Integration	Compatible with hot-dip galvanizing lines and downstream rinsing/drying systems
Control	PLC automation for bath monitoring, chemical dosing, and line speed

Working Principle

The system combines pickling, rinsing, and fluxing processes within a fully enclosed structure. Contaminated solutions and fumes are contained and treated, preventing emissions and protecting the working environment. Automated controls regulate bath temperatures, chemical concentrations, and line speed to ensure consistent steel surface preparation.

Application in Hot-Dip Galvanizing

Enclosed Pretreatment Systems are widely used for strips, sheets, and profiles. By providing consistent cleaning, pickling, and fluxing, they improve zinc coating adhesion, enhance surface quality, and reduce chemical and fume emissions, supporting sustainable and efficient galvanizing operations.

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Frequently Asked Questions

What processes can be included inside the enclosed pretreatment system?

The enclosure can contain degreasing, rinsing, pickling, fluxing and other required pretreatment stages. The tank arrangement and process sequence are customized according to the products being galvanized and the required production capacity.

How does the system prevent acid mist from escaping?

An extraction system maintains controlled negative pressure inside the enclosure. Sealed openings, controlled airflow and automated doors help direct acid-laden air toward the acid gas scrubber instead of allowing it to escape into the workshop.

Can the system work with automatic material handling equipment?

Yes. It can be integrated with automatic cranes, RGV systems, monorails, transfer trolleys or conveyors. PLC controls can coordinate tank positioning, lifting, transfer and process timing.

Can an existing galvanizing plant be upgraded with an enclosure

Yes. WEDONE can develop a retrofit solution according to the existing tanks, building dimensions, material flow, crane arrangement and available installation space. A site survey and detailed layout information are normally required.

What information is needed to design the system?

Please provide the tank dimensions and arrangement, steel-product dimensions, jig weight, production capacity, pretreatment process, material-handling method, workshop layout and applicable emission requirements.

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