Hot dip galvanizing is a method of coating a steel with metallic zinc to prevent it from corroding. Preliminarily the object to be hot dipped galvanized is passed through a chemical clean to remove all rust, oil & surface scales. After the cleaning, the cleaning solutions is rinsed off the surface and the steel is taken further for coating.
The steel is then dipped into a bath of hot molten zinc which has been heated to a temperatur eof 460 Deg Celcius. The steel substrate is then removed from the bath and allowed to cool in a quenching tank. When the substrate is colled, the zinc coating is metallurgically bonded to the steel. High tensile fasteners like B7/2H, Grade 8.8, 10.9 & 12.9 Fasteners are commonly Hot Dipped Galvanized.