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Hot‑Dip Galvanizing (HDG)

sand casting (41)

This method dips the iron or steel into molten zinc, which bonds with the surface and forms a protective layer. It involves the following steps:

 

Cleaning: This is to remove all forms of oil and dirt with a caustic solution.

 

Pickling: This next step involves putting the metal into acid to remove rust.

 

Fluxing: Once pickling is done, the metal goes into a flux solution to stop it from oxidizing before dipping.

 

Dipping: The steel is then dipped into a molten zinc bath until the temperature is the same as the bath, which is around 450°C.

 

Cooling: The material is then removed and allowed to cool, typically in air, solidifying the coating. (Quenching in water is sometimes used but is not the standard step; cooling is.)

 

This process creates a metallurgical zinc-iron alloy layer bonded to the steel, covered by an outer layer of pure zinc which, as it solidifies, can develop a shiny, snowflake look called a spangle.

galvanized steel structural components

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