HOT
DIPPED GALVANIZING
with a corrosion resistant finish applied to the steel after fabrication.
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Hot Dipped Galvanizing Corrosion Protection with Zinc
nuts and other small parts requires corrosion protection. The proven
effectiveness of zinc in controlling corrosion makes it an ideal choice
for protecting structural steel. Hot dipped galvanizing is generally the
most effective method of applying zinc to steel.
to the two fold nature of the coating. The zinc coating provides barrier
and cathodic protection to the underlying steel surface.
a series of zinc-iron alloy layers which, together with the outer zinc
layer, are metallurgically bonded to the steel surface. The resulting
barrier coating has a very low corrosion rate (Figure 1) and, because
of the hard alloy layers, is highly resistant to mechanical damage.
Galvanized steel is much less susceptible to coating damage from
handling than is painted steel.
of the work piece in molten zinc. This process ensures a uniform coating
on all surfaces, even on those areas not normally accessible to mechan-
ical applicators.
areas of bare steel (up to 1/4 inch wide) accidentally exposed in service.
The sacrificial nature of zinc prevents the steel from corroding adjacent
to the galvanized coating, thus preventing undercutting and blistering of
the protective film. In comparison, exposed steel on painted surfaces
will corrode immediately. The resulting rust occupies several times the
volume of steel from which it was formed, causing the lifting and
subsequent flaking of the adjacent paint film (Figure 2).
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