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Facts about Hot-Dipped Galvanizing

The process of using zinc to protect steel from corrosion (hot-dipped galvanizing) is a 150 year old practice. Hot-dipped galvanized steel lasts longer today than it did 20 years ago. This is due to the enforcement of our environmental laws, which keep our air cleaner and less contaminated with corrosive emissions. The galvanized surface (zinc coating) is self-sacrificing which means that the coating slowly sacrifices itself by galvanic action to protect the base steel. This sacrificing action continues as long as any zinc remains in the immediate area. How is it done?

  1. Receiving & Inspection Material loaded on racks Inspected for proper venting & bracing
  2. Cleaning and Degreasing Caustic solution 8-12% sodium hydroxide 3-4% sodium metasilicate 160 to 180F Removal of paints/grease Rinse required
  3. Pickling 10-15% Hydrochloric acid Removal of full range of iron oxides Bare metal exposed to react to zinc bath Rinse required
  4. Preflux 15-25% ammonium chloride, 140 - 180F Forms ferric chloride & ammonia to prevent oxidation
  1. Dry & Preheat 350 air dryer Evaporate all water Preheat steel surface prior to zinc bath
  2. Molten Zinc bath Immersion in 850F molten zinc Galvanic reaction is complete when base metal reaches zinc temperature Pure zinc outer coating deposited when removed from molten zinc bath
  3. Inspection & Shipping Coating thickness & visual quality Mark with drawing number

Features & Benefits

(SOURCE : American Galvanizers Association, Inc.)

Touch Up & Repair

Hot-dipped galvanized areas damaged by welding, flame cutting or during handling, transport or assembly and are larger than 3/16" on flat surfaces or 1/10" on cut ends should be repaired by the following recommended method.

Cold Galvanizing Compound

Welding

Hot-Dipped Galvanized Equipment Maintenance

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