Hot dip galvanizing line

Hot dip galvanizing line

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Hot dip galvanizing line

Hot-dip galvanizing is a process whereby molten zinc reacts with the iron substrate to produce an alloy layer, thus combining both the substrate and the coating. The hot-dip galvanizing process starts with pickling the steel workpiece, in order to remove the iron oxide from the surface of the workpiece, after pickling, it is cleaned by ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tanks, and then it is sent to hot-dip galvanizing tanks. Hot dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life.


For enhanced protection against the elements, Hot Dip Galvanizing Line incorporates a sophisticated chromatizing process. This adds an extra layer of defense, ensuring that the products are safeguarded against the harshest environmental conditions.


Introduction of hot-dip galvanizing process

Loading→degreasing→water washing→acid washing→water washing→Fluxing→drying & preheating→hot-dip galvanizing→cooling→passivation→ Drying → Inspection

Description of the process

(1) Degreasing

Chemical degreasing or water-based metal degreasing cleaning agent can be used to remove oil until it is wet by water.

(2) Acid washing

(3) Fluxing

It can keep the workpiece with certain activities before dip plating.

(4) Drying and preheating

Remove residual moisture to prevent zinc explosion, resulting in zinc splash.

(5) Hot-dip galvanizing

(6) Passivation

Reduce or prolong the time of white rust appearance, are passivated with chromate, such as Na2Cr2O7 80 ~ 100g / L, sulfuric acid 3 ~ 4ml / L.

(7) Cooling

Generally water cooling, but the temperature should not be too low.

(8) Inspection

The surface of the plating is bright, detailed, and free of flow hanging and wrinkled skin. The bending press can be used to bend the sample piece for 90~180°, and the hammer can also be used to knock for inspection.


Unveil a world of possibilities as steel wire, tubesheet undergo remarkable transformation. Hot Dip Galvanizing Line is tailored to complete every step in accordance with your specific orders.

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