Table of Contents:
Table of Contents
Introduction: What is Galvanized Iron?
Galvanized Iron is Iron iron with a protective Zinc zinc coating on the outside. By coating the Iron iron with Zinczinc, the material is well protected from corrosion, something that Iron iron by itself is known to struggle with. This is critical as rust/corrision corrosion will eat away at the exterior and core of the Iron iron causing structural integrity issues [1].
How it's
made:Iron can be Galvanized in a variety of ways.
One is theMade
Hot Dip
The hot-dip method
whichinvolves submerging the Iron surface into molten
Zinczinc. Before the Iron is placed into the molten
Zinczinc, it must first be chemically cleaned to remove any surface impurities. The
Ironiron is then submerged into a highly concentrated
Zinczinc bath (~95%+ pure). While in the bath, the
Zinczinc and Iron metallurgically bind together to form metallic layers, with the
Zinczinc preventing corrosion to the inside Iron [2].
Cold Dip
Another method is cold-dip galvanization, which involves coating the outer layer of
Ironiron with a
Zinczinc-rich paint. The paint can be applied from a variety of methods from hand brushes to spray guns. Another cold method of application is electrogalvanizing, which is similar to electroplating, in that
Zinczinc is used as the
Anodeanode to electroplate the
Ironiron metal, providing a strong bond between the
Zinczinc and Iron layers [2].
Advantages vs.
Disadvantages:Galvanized Iron provides three main benefits in terms of corrosion protection and longevity. The first is barrier protection, where the Zinc layer provides aDisadvantages
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Applications
Galvanized Iron has a variety of application from structures to nuts/bolts. It is used almost everywhere becuase because of its protection against corrosion and its longevity against the elements. Although Galvanized Iron is fairly common, its similar counter part, Galvanized Steel, is used much more often because of its strength benefits over Iron. It is used in structures like bridges, buildings, streetlights, etc for its recyclable properties and corrosion resistance. Furthermore, it is used in nuts, bolts, washers, etc so that the any joints that are held together don't experience corrosion overtime [4].
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