Galvanized Steel Sheet: Addressing: The Issue of Corrosion Susceptibility

Steel has always been and continues to be a favorite among engineers. They find it very suitable for various functions. Steel sheet is prized for it many qualities. Engineers view it as the solution to diverse structural and architectural applications. While corrosion susceptibility is an issue, there are solutions. Galvanized steel sheets are one-response scientists have found to be effective.

Steel Sheet: Strong and Functional

Steel sheet possesses several mechanical properties that make it admirably suitable for engineering applications. The following qualities alone make it attractive for structural and other uses:

Strength

Toughness

Ductility

• Good formability

• Great weldability

• Easy to paint

• Readily available

• Ferromagnetic properties

• Recyclability

• Low cost

However, sheet steel does suffer from a susceptibility to corrosion. This occurs when moisture is present. It also undergoes oxidation at elevated temperatures. As a result, to make use of the metal’s more favorable properties, it is essential to provide some form of protection. The result is susceptible galvanized steel sheets.

Protecting Steel from Corrosion

Fabricators and other metal workers can draw on one of several methods to provide steel sheet with protection against corrosion. These include:

• Creating an alloy

• Altering the environment e.g. reducing the humidity

• Application of a coating – usually metallic

One of the most widely employed methods is continuous hot dipping and applying a protective metallic coating. Coatings can consist of any of the following metal or metal alloys:

• Zinc

• Zinc-iron alloy

• Aluminum

• Aluminum-silicon alloy

• Zn-5Al alloy

Of all the metals and metal alloys on this list, zinc proves to be a favorite among fabricators.

Zinc Coated Galvanized Steel Sheets

Hot-dip zinc coating is the most commonly employed means of providing steel sheet with the protection it needs to prevent corrosion. Fabricators will determine the most effective thickness for galvanized steel sheets. The thickness will depend upon the specific application. For example, steel requires a thicker coating for highway drainage culverts than for automobile components.

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