Hot dip Galvanizing

Hot-Dip Galvanizing is a process of coating iron or steel with a thin layer of zinc by passing it through a molten zinc bath at a temperature of around 4500°C. When exposed to the atmosphere, pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate. Zinc carbonate is a dull grey, fairly strong compound that stops further corrosion in many circumstances, protecting the steel from the elements. Galvanized steel is widely applied in situations that require rust-resistance and can be identified by a crystallized pattern on the surface (spangle). Hot Dip Galvanizing is done in our In-house galvanizing plant having a 7m long x 1.2m wide x 1.2m deep bath. We have two Hot Dip Galvanizing baths.

As per international standards, we use 7 tank process, which includes:

  • Decreasing
  • Washing
  • Pickling
  • Rinsing
  • Prefluxing
  • Quenching
  • Dichromating

References taken for the standardization process are:

  • British Standard: EN ISO 1461: 1999
  • American Standard: ASTM-A 123
  • German Standard: DIN 50976
  • Indian Standard: IS 2629

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