Hot dip galvanising

It is the process by which iron and steel can be treated to prevent rusting.

In essence it involves dipping the article with a chemically clean surface into a bath of molten zinc which reacts with the iron and forms a coating.

National Galvanising Industries pty ltd

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Galvanising Process

Hot dip galvanising is an immersion process where steel sections and fabrications undergo the following operations:

Hot caustic degreasing

Hydrochloric acid pickling

Rinsing

Prefluxing in zinc ammonium chloride solution

Hot dip galvanising

Quenching

Removal of oil, organic materials, selected mill primers and paint

Removal of rust and mill scale

Removal of pickling acid residues

Surface conditioning

At 450-460°C

Surface conditioning

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