Abrasion Resistance
Zinc is bonded to the base steel by the
galvanizing process by over 3600 psi (2.48 x
107 Pa) due to
the metallurgical bond that occurs during
the dipping process. This fact along
with the development of the intermetallic
alloy layers that are harder than bare steel
combine to ensure a highly abrasion resistant
coating. Handling requirements for galvanized
reinforcing steel are minimum and damage in
the field is not typical.
Other
coatings damage easily during shipment or
through rough handling on the job site. Experts
will argue that all organic forms of barrier
protection (such as paint) by their nature
are permeable to some degree. Galvanized coatings
are impermeable. Furthermore, if the galvanized
coating is physically damaged, it will continue
to provide cathodic protection to the exposed
steel. If individual areas of underlying steel
or iron become exposed by as much as 1/4"
(7 mm) in diameter, the surrounding zinc will provide
these areas with cathodic protection for as
long as the coating lasts.
Cathodic
Protection
