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Powder Coating of Galvanized Zinc Monotube Structures for Department of Transportation

Powder Coating of Galvanized Zinc Monotube for Department of Transportation Doubleleg structure Monotube base
Montube curve prep Monotube first article Monotube fixture
Monotube fixture Monotube long shot Single leg strcutre

Broken Arrow Powder Coating has assisted the Oklahoma Department of Transportation, City of Tulsa Oklahoma, Science Applications International Corporation (SAIC Engineers) with the development of a powder coating specification for transportation highway elements such as, hand rails, light poles, and ornamental components. The consultation led to the powder coating of hot dipped, galvanized zinc, monotube interstate highway sign structures. Once we were awarded the bid, we were able to ramp up our powder coating operation in just four days to meet the increased demand.

The 35-ft. highway sign structures received an initial SSPC-SP1 brush blast and mechanical sanding to prepare the galvanized surface for powder coating. The overhead highway sign structures include several components and were powder coated in Broken Arrow’s 10 x 12 x 35-ft. oven.

Powder coating galvanized zinc metals extends the life, thus reducing repair and replacement costs over the lifetime of the structure. By encapsulating the heavy metal zinc structures, transportation departments lessen their impact on the environment by not allowing zinc or zinc oxide to leach into the eco-system.

For highlights of this powder coating project see the table below.

Highlights of Powder Coating for Zinc Monotube Structures

Product Description The powder coating process was used to coat galvanized zinc monotube components for transportation, highway and bridge structures.
Capabilities Applied/Processes 
  • SSPC-SP1 Surface Preparation and Brush Blast
  • Mechanical Sanding
  • Powder Coating

Equipment Used 10x12x35-ft. capacity oven

Coating Super-durable TGIC Polyester Powder Coat

Coating Characteristics 
  • Black Powder Coat Finish
  • Very Good Adhesion Characteristics
  • Corrosion Resistant
  • Excellent Exterior Durability

Substrate Carbon Steel / Hot Dipped Galvanized Zinc

Overall Component Dimensions 20-ft. H x 90-ft. L x 2-ft. Diameter

Total Component Weight 22,000 lbs.

Powder Coating Thickness Per Oklahoma Department of Transportation’s Specifications

Number of Components 6 complete structures

Industry for Use Department of Transportation

Inspection Performed Exceeded Oklahoma Department of Transportation’s Inspection and Testing Parameters

Product Name Powder Coated Galvanized Zinc Monotube

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