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NEW! - Hot dipped galvanized finish
The steel products displayed on this thumbnail page are now available
with a corrosion resistant finish applied to the steel after fabrication.
Contact us for pricing!

Hot Dipped Galvanizing Corrosion Protection with Zinc

Steel used to construct buildings, equipment, ornamental iron, bolts,
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.
Why Galvanizing Works
The excellent corrosion resistance of hot dipped galvanized steel is due
to the two fold nature of the coating. The zinc coating provides barrier
and cathodic protection to the underlying steel surface.
Corrosion Protection And Long-Lasting Good Looks
A unique blend of special high grade zinc, nickel, and other earthly
metals combined with processing systems dedicated to maximizing the
aesthetic of the steel product makes galvanizing an ideal choice for
decades of steel corrosion protection and long-lasting good looks.
Galvanized Steel With Aesthetic Appeal
We realize that the professional community demands more than just
steel corrosion protection. The galvanized steel must have an aesthetic
appeal as well, whether it will be left in its galvanized finish or primed
and painted. Duragalv combines the best of both worlds.
Up To 200% Harder Than The Steel Itself
Duragalv uses a series of alloying elements designed to increase the
toughness of the metal coating. It is harder than typical galvanizing. The
alloys on the surface include more iron which makes this protective
coating harder than the base steel. In some cases it is 200% harder than
the steel being coated. This hardness provides greater durability for the
metal coating.
What Makes Duragalv Special?
Duragalv is a unique blend of special High-Grade Zinc (the most environmentally sensitive zinc available) combined with processing
systems dedicated to maximizing the aesthetic of the steel product. By
combining nickel, utilizing the dry kettle process and creating extensive
testing and monitoring procedures, We have taken the art of hot dip
galvanizing to the next level.
Environmentally Friendly And Green Too
Best of all, Duragalv is environmentally friendly and is a “partner” in
the “Green Building” community.
What is the production process for hot-dip galvanizing?
Step 1: Surface preparation
Thorough cleaning is necessary as zinc will only adhere to clean steel. This gets accomplished by:
• Degreasing: a hot alkaline cleaner is used to remove oil, grease, dirt, loose particles, and any other contaminates
   that may exist on the surface of the material
• Acid pickling: an acid bath is used to remove mill scale and oxides
• Fluxing (dry kettle): pre-fluxing in a zinc ammonium chloride solution to remove oxides and to prevent oxidation
   prior to dipping into molten zinc
Step 2: Immersion in bath of molten zinc
During this step, the steel is immersed in a bath of molten zinc at approximately 830°F. The mix in the bath consists
of ~98% pure zinc and 2% additives (Al, Bi, Ni). The zinc reacts with the iron in steel and it forms a coating which is
metallurgically bonded to the steel. Also, the zinc flows into recesses and other areas difficult to access, coating all
areas of complex shapes thoroughly for corrosion protection. Hot dip galvanizing is the only coating system that
protects tubular steel on the inside. The zinc goes “in, around, over, under and through” the fabrication.
The size of zinc baths varies from galvanizer to galvanizer and this restricts the size of steel that can be galvanized.
When choosing a galvanizer, make sure that the size of the zinc bath is big enough to accommodate the size of your
products such as large structural shapes.
The final product is protected against corrosion as zinc creates a barrier between steel and the environment and also
cathodically protects the base metal.
Step 3: Finishing
After the steel is withdrawn from the galvanizing bath, excess zinc is removed by draining, by vibrating or for small
items, by centrifuging. The galvanized item is then cooled in air.
Step 4: Inspection
Steel is inspected after galvanizing to verify conformance with specs.
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