01
DEGREASING
Soil and grease removal: A hot alkaline cleaning solution is used to remove oil and grease
Process
Surface Preparation
Hot-Dip Galvanizing
01 Degreasing
Soil and grease removal: A hot alkaline cleaning solution is used to remove oil and grease
02 Rinsing
To prevent alkaline from reacting with pickling solution, preventing unnecessary acid waste
03 Scale Removal or Pickling
The steel passes through an acid bath to remove surface rust and mill scale to produce a clean metallic surface
04 Rinsing
To remove acid and iron salt
05 Pre-Fluxing
The cleaned steel is immersed in a hot flux solution (usually zinc ammonium chloride) to prevent oxidation and ensure that the surface is chemically clean before its immersion in molten zinc
06 Galvanizing Bath
The dried fabrication is next immersed in molten zinc where it immediately reacts to form the zinc-iron alloy layers on its surface. The period of immersion depends solely on the zinc and weight of the steel product
07 Quenching
The steel is withdrawn from the molten zinc bath at a controlled speed. In addition to the zinc/alloy layers, a coating of relatively pure zinc solidifies at the surface when chilled in water. This total zinc coating is metallurgically bonded to the steel, completely covering the whole article
08 Finishing
All materials will be transferred to the de-racking section for final inspection and touch-up of any bare spots and removal of sharp edges