Quality Mechanical Steel Tube for the Conveyor Industry

Galvanizing Coating

Allied uses special high-grade quality zinc for its galvanizing operation. Our zinc is 99.99% pure and contains only a trace amount of lead. Hot-dipped galvanized pipe or pipe made from pre-galvanized steel coils normally use Prime Western grade zinc and other grades which contain a high level of lead, sometimes more than 1% by weight.

Conversion Coating

The conversion coating over the galvanized surface is formed due to a chemical reaction and this film becomes an integral part of the zinc coating. The film passivates the highly reactive zinc surface and retards the formation of white rust by a substantial margin. Also, the conversion film enhances bonding or adhesion of any additional paints or coatings applied over the galvanized surface.

Clear Organic Polymer Coating

The clear organic polymer coating is applied as a third coat or final finish on the exterior surface. This final layer acts as a barrier coating and further reduces the atmospheric corrosion of the product. However, there is an interesting phenomenon that occurs as a result of the combination of the second and third coating. Combined performance (corrosion protection of these two coatings) is more than the summation of the individual protection provided.

Zinc-Rich Paint Interior Coating

We have a number of ID (interior diameter) zinc coatings which have been specially formulated to meet specific customer fabrication requirements. We are continuously upgrading our ID coatings to maximize the overall corrosion resistance of the interior of the tube. All our ID coatings are applied after the tube is welded…thereby assuring a uniform coating on the entire interior surface. In addition, none of our ID coatings will contaminate paint or powder coat cleaning systems.

Tight Inside Diameter Tolerances & More Advantages

  • The cold-forming and quenching process creates greater yield and tensile strength than competitive product alternatives.
  • The tube is welded prior to the application of coating; thus the weld area is as protected from corrosion as the rest of the tube body.
  • Flo-Coat tubing exhibits greater corrosion resistance because of the synergism created between the coatings; the conversion coating passivates the zinc to slow down the white rust growth process, and the clear top-coat then “seals in” the protection.
  • The clear third coating also acts as a primer for painting or powder coating. Extensive pre-cleaning is unnecessary, and excellent adhesion is achieved, even at high baking temperatures.
  • Powder coating over Allied´s galvanized substrate provides substantial corrosion resistance superiority over powder coating a raw/uncoated substrate. Powder coating over a galvanized surface provides corrosion protection 5-6 times longer than the same over raw or bare surface.
  • Welding Flo-Coat is easily done in the exact same manner as welding bare steel. Allied´s zinc coating contains the lowest lead content achievable (99.9% pure zinc, average 13 ppm), so lead oxide fumes generated during welding are kept to an absolute minimum. Hot-dip galvanized products usually contain up to .5% lead (5000 ppm).
  • Allied’s galvanized products can be easily fabricated…bent, swaged, wall-to-wall flattened…without deformation of the triple layer of protection. Competitive products tend to flake and chip during fabrication.

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