Hot Dip Galvanizing is a long lasting and cost effective
method of protecting metals from Corrosion. Some time Paint or powder coating
is being applied over galvanized steel to create a duplex system. In order to
increase economic life of structure or to increase protection in very
aggressive environment this duplex system is used in which colors are being
added for safety. These paint coatings are applied after metals passes through galvanizing
process or some time later when the galvanized coating weathered. It is also
very useful for industrial galvanized steel beams.
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| Painted Galvanized Steel |
When you remove the metal from galvanized bath, zinc
quickly reacts with environment immediately and eventually forming adherent,
water in-soluble layer that is known as Zinc Patina. Three stages of weathering
of zinc are:
1.
Newly Galvanized (that is up to 48 hours after
galvanizing process)
2.
Partially Weathered (between 48 hours and 2 year
after galvanizing process in this form zinc patina is formed partially)
3.
Fully weathered ( Between 8months and 2 years
with completely formed zinc patina)
After viewing the above information you can easily know the
importance of Painted Galvanized Steel. It is being used through out the world
in order to increase the life of economic structures.
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