This standard details the recommended practice for hot-dip galvanizing of iron and steel to protect them against corrosion. It comprehensively covers the required surface preparation (degreasing, pickling, fluxing), zinc bath temperature maintenance, and dipping processes.
Describes procedures for hot-dip galvanizing of iron and steel articles, related to corrosion protection for fencing and barriers.
Quick Reference Values
recommended zinc bath temperature445°C to 465°C
hydrochloric acid concentration for pickling10% to 15% by mass
sulfuric acid concentration for pickling5% to 15% by mass
sulfuric acid pickling temperature60°C to 80°C
minimum zinc purityConforming to IS 209 (typically 98.5% to 99.95%)
Practical Notes
Fabricators must ensure proper venting and draining holes are provided in tubular and hollow sections to prevent explosive pressure build-up during dipping.
IS 2629 covers the galvanizing 'process' and best practices; however, engineers must refer to IS 4759 for the actual specified coating thickness and mass requirements.
Special care must be taken against hydrogen embrittlement when galvanizing high-tensile steel (referencing IS 6158).