Galvanizing of castings is covered by BS EN ISO 1461 : 2009.
Hot dip galvanizing of cast iron provides excellent protection from corrosion and the coating is applied by immersion in molten zinc at 450°C forming a tough, adherent coating which is bonded to the base metal by a series of zinc-iron alloy layers overlaid with free zinc.
If any problems are experienced with hot dip galvanized castings, they can usually be traced back to the surface condition of the casting. Causes include burnt-on moulding sand, oxides from the annealing process, traces of graphite or pollution, or surface flaws such as shrinkage holes.
This datasheet offers information on the following:
- types of castings
- castings surface preparation for hot dip galvanizing
- design of cast iron sections
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