AGV

Process

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
HOT DIP GALVANIZING

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The steel is withdrawn from the molten zinc bath at a controlled speed.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

Surface Preparation
Hot-Dip Galvanizing
Degreasing

01 Degreasing

Soil and grease removal: A hot alkaline cleaning solution is used to remove oil and grease

Rinsing

02 Rinsing

To prevent alkaline from reacting with pickling solution, preventing unnecessary acid waste

Scale Removal or Pickling

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

Rinsing

04 Rinsing

To remove acid and iron salt

Pre-Fluxing

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

Galvanizing Bath

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

Quenching

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The steel is withdrawn from the molten zinc bath at a controlled speed.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

Finishing

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