Allied’s zinc Flo-Coat® galvanized steel tubing is the product of choice for residential and commercial construction. The unique, in-line Flo-Coat® process provides a triple layer of corrosion protection that stands the test of time.
The process begins with flat strip steel, which is cold formed and electric-resistance or induction welded. The cold forming and quenching process creates greater yield and tensile strength compared to alternative tubing of the same O.D. and gauge. After welding, the tube goes through three coating baths. The first coating bath bonds zinc to the hot tubing, and is followed by a conversion coating bath.REQUEST A QUOTE
The process chemically changes the zinc already on the surface of the tube. The compounds which are formed make the zinc even less subject to corrosion than unprotected zinc. This conversion coating also provides another layer of protection for longer resistance to white rust corrosion.
The excess solution is then removed from the tube and the tube is dried to prepare for its third and final protective coating bath…an application of a clear organic polymer to give the tube superior corrosion resistance, added aesthetic appeal, and long-lasting surface brightness. This coating is then cured to a smooth, hard finish near the end of the in-line process. The result is a smooth, shiny end product appearance that is unmatched in terms of strength and durability – it will not oxidize or “gray down” with age, nor will the coating flake off during fabrication operations.
Allied’s Flo-Coat® galvanized steel tubing provides outstanding corrosion protection because of the synergism created between the three coatings. The conversion coating passivates the zinc to slow down the white rust growth process, and the clear topcoat then “seals in” the protection.
Pregalvanized products do not provide this “sealed” protection. On the inside of Allied’s Flo-Coat galvanized steel tubing a corrosion-resistant zinc based coating is applied after the tube is welded, and completely covers the interior. When pregalvanized steel is formed and welded, the inside weld area is left bare – unprotected since the interior cannot be re-metalized. The exposed metal is immediately left to be attacked by all corrosive elements. The exterior of the weld is re-metalized, but is still far more susceptible to corrosion than Allied’s Flo-Coat® galvanized steel tubing.
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