This standard provides a code of practice for the hot-dip galvanizing of steel structures. It specifies requirements for the base steel material, the galvanizing process including surface preparation and zinc bath composition, and the properties, inspection, and testing of the final zinc coating.
Lays down recommendations for hot dip galvanizing of fabricated steel structures and components, such as metal fencing and crash barriers, for corrosion protection.
Quick Reference Values
Minimum zinc purity for galvanizing bath98.5% by mass
Typical zinc bath temperature445 to 465 °C
Minimum average coating mass for steel > 5mm thick610 g/m²
Minimum average coating thickness equivalent for steel > 5mm thick86 µm
Minimum individual coating mass for steel > 5mm thick460 g/m²
Practical Notes
This standard has been withdrawn. For current practice, refer to IS 2629 (Recommended practice for hot-dip galvanizing) and IS 4759 (Specification for hot-dip zinc coatings).
Proper surface preparation (degreasing, pickling, fluxing) is absolutely critical to achieve good adhesion and a uniform coating.
Be aware of potential distortion of thin or complex fabricated parts due to the high temperature of the molten zinc bath.