Hot dip galvanizing provides the most effective form of corrosion protection for fabricated steel. During the HDG process the zinc coating forms a chemical bond with the steel, to become part of the physical structure. This creates 3 layers of protection for predictable performance:
- Barrier protection is the physical envelope of galvanizing around the steel. In hollow sections, i.e. pipes, this envelope is internal & external.
- Zinc patina reduces the exposure of the galvanizing coating to the environment
- Cathodic protection from the surrounding galvanizing coating protects small areas of exposed steel from corrosion.