Hot dip galvanizing || Mechanical technology

Описание: In modern steel fabrication and construction, protecting metal surfaces from rust and corrosion is critical. One of the most effective, widely used methods is hot-dip galvanizing.
The photo/video shows workers operating an industrial line dipping large steel pipes into a treatment bath – likely a step in the pickling, rinsing, or hot zinc dipping process. Water splashing indicates intensive cleaning or cooling.
Detailed process description
Step 1 – Surface Preparation
Steel pipes are cleaned mechanically to remove dirt, grease, and loose rust.
Step 2 – Chemical Pickling
Steel is dipped in acid (typically sulfuric or hydrochloric) to remove remaining rust and oxides.
Step 3 – Water Rinse
After pickling, steel is thoroughly rinsed to remove residual acid. This step is likely what's pictured, with strong water jets rinsing the pipes.
Step 4 – Fluxing
Pipes are immersed in zinc-ammonium chloride to improve adhesion and prevent oxidation before dipping.
Step 5 – Hot-Dip Galvanizing
After drying, the steel is immersed in molten zinc at ~450 °C. Zinc reacts with the steel surface to form a durable, corrosion-resistant layer.
Step 6 – Cooling and Inspection
Finally, the coated steel is cooled in water or air and inspected for thickness, surface finish, and quality.
Advantages
Long-lasting rust protection for decades.
Lower maintenance costs over time.
Enhanced durability for infrastructure.
Suitable for harsh environments (marine, chemical industry).
More cost-effective than repeated painting.
Wide Applications
Lamp posts, railings, fences.
Structural pipes for warehouses, bridges Telecom and power transmission poles. Water and gas pipelines.
Industrial and residential outdoor structures.
Modern Technology in the Photo
The factory setup includes an overhead crane with specialized clamps:
Automated lifting, dipping, and transferring.
Higher productivity with less manual labor.
Reduced accident risk.
Precise timing and movement for uniform coating.
The visible water splash suggests a high-pressure rinsing or cooling stage, ensuring clean surfaces before zinc coating or rapid cooling after.
Safety and Environmental Considerations
Worker protection with hard hats, reflective vests, gloves.
Safe acid/wastewater treatment.
Reclaiming excess zinc.
Emissions control with fume extraction.
Conclusion
The scene in the photo is part of a modern hot-dip galvanizing process, essential for protecting steel from rust, extending service life, and cutting maintenance costs. Automated equipment and trained workers ensure high quality and safe, efficient production.

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