HOT-DIP GALVANIZING
AZZ Galvanizing Services • 3100 W. Seventh St. • Suite 500 • Fort Worth, Texas 76107
Phone: 817-810-0095 • Fax: 817-336-5354
©2010 AZZ incorporated. All rights reserved
How is Hot-Dip Galvanizing Applied?
Step 1: Preparation
As the steel products arrive at our plant, they are thoroughly inspected for drainage and
venting requirements. In the staging area, an efficient handling method is chosen to
transport the material through the initial cleaning process.
Step 2: Cleaning
The material is cleaned in three steps:
• Total immersion in a hot alkali solution to remove organic compounds.
• Acid pickling removes rust or scale.
• Fluxing eliminates oxides from the surface of the steel and promotes the proper--
-----------metallurgical bonding of the zinc in the next step.
Step 3: Hot-Dip Galvanizing
The steel is totally submerged in a bath of molten zinc until it reaches bath temperature
(approximately 840° F.) at which time the zinc reacts with the steel to form zinc/iron
intermetalic layers on all surfaces, inside and out.
Step 4: Quality Inspection
The galvanized steel product is cleaned, weighed and then thoroughly inspected for coating
thickness, appearance and compliance with applicable ASTM specifications. Calibrated
instrumentation insures efficient inspection.
