Hot Dip Galvanizing is the process of dipping fabricated metal into kettle containing molten zinc.
This process provides significant advantage over other corrosion protection methods as the iron in the steel metallurgically reacts with the molten zinc and form a tightly-bonded alloy coating.
Hot Dip Galvanizing is done in accordance with British Standard specification, BS EN ISO 1461 standard which specifies a minimum coating thickness to be applied to steel in relation to the steels section thickness.
| Category | Minimum Mean Coating Mass (g/sq m) and Thickness (um) | ||
|---|---|---|---|
| Not Centrifuged Steel | Steel > 6mm in thickness | 610 (g/sq m) | 85 (um) |
| Steel > 3mm & <=6 mm in thickness | 505 (g/sq m) | 70 (um) | |
| Steel > 1.5mm & <=3 mm in thickness | 395 (g/sq m) | 55 (um) | |
| Steel > 1.5mm in thickness | 325 (g/sq m) | 45 (um) | |
| Not Centrifuged Iron Casting | Steel > 6mm in thickness | 575 (g/sq m) | 80 (um) |
| Steel < 6mm in thickness | 505 (g/sq m) | 70 (um) | |
| Centrifuged Articles with Thread | > 6mm in diameter | 360 (g/sq m) | 50 (um) |
| <=6 mm in diameter | 180 (g/sq m) | 25 (um) | |
| Centrifuged Others Articles
(Including Iron Cast) |
> 3mm in diameter | 395 (g/sq m) | 55 (um) |
| <=3 mm in diameter | 325 (g/sq m) | 45 (um) | |
