Published July 2021

Datasheet 1: Corrosion Protection Using Zinc Coatings

The various processes for protecting steel from corrosion using zinc coatings and their characteristics

  • Hot dip galvanizing (general galvanizing)
  • Continuous galvanizing
  • Thermal zinc spraying
  • Metallic coating with zinc dust (sherardizing)
  • Zinc mechanical plating
  • Zinc-rich painting
  • Zinc electro-plating
  • Cathodic protection

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Hot dip galvanizing coating
A metalurgically bonded coating of zinc-iron alloy is formed with an outer layer of pure zinc. A typical coating thickness is 45-85 µm, but thicker coatings can be produced on structural steelwork by grit blasting the steelwork prior to galvanizing.

Continuous galvanizing coating
The continuous hot dip galvanizing of steel strip, wire and tube involves passing through molten zinc in an automated plant. Although alloyed with base steel, the coating is generally much thinner than batch galvanizing.

Thermal zinc spraying coating
The coatings aren`t alloyed with the base steel and while the coating can be built-up to the required thickness, they are always slightly porous. Read more in the datasheet…