Perhaps the most critical choice made in the design of fabrication connections is how to protect the fasteners from corrosion. Hot-dip galvanizing delivers long-term, maintenance-free corrosion protection in a variety of exposure conditions. Whether used in atmospheric, concrete, soil, or fresh- or salt-water applications, hot-dip galvanizing delivers maximum service life. There will be no difficult field repairs and no labor and material costs normally associated with replacing unprotected fasteners.
Left unprotected, steel will corrode and suffer loss of mechanical properties and integrity that is very dangerous when it happens to fasteners. Hot-dip galvanizing prevents corrosion by coating steel with zinc. The galvanized coating is metallurgically bonded to the underlying steel, forming an impervious barrier between the steel substrate and the corrosive environment. The hot-dip galvanized coating also preferentially corrodes to protect the fastener’s underlying steel and is able to protect small areas of the fastener’s steel that may become exposed when mechanically damaged. Hot-dip galvanizing is the most effective method for delivering both long-term barrier protection and cathodic protection.