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Galvanized, Galvalume and Galvanneal are three of the more popular coatings used to protect steel from corrosion. Each of these coatings has unique properties and advantages, making them suitable for different applications and we will provide more clarity on why you may choose one over the other!
Galvanized coating is made by dipping steel into molten zinc, which forms a protective layer over the surface of the steel. Zinc is an excellent sacrificial material, which means that it will corrode before the steel does. This means that even if the zinc layer is damaged, the steel beneath it will remain protected. Galvanized coating is affordable and easy to apply, making it a popular choice for various applications.
Galvalume is a coating made of a combination of aluminum, zinc, and silicon. The aluminum provides a barrier against corrosion, while the zinc provides sacrificial protection. Silicon is added to improve the adhesion of the coating to the steel. Galvalume is a popular choice for roofing and siding applications, where it provides excellent corrosion resistance.
Galvanneal is a coating made of a zinc-iron alloy. The steel is dipped into a molten zinc-iron alloy, which forms a tightly bonded coating on the surface of the steel. Galvanneal is often used in applications where the steel will be painted, as it provides excellent paint adhesion.
Galvanized Steel
Galvanneal Steel
Galvalume Steel
Appearance
Galvanized Steel Shiny Rough Spangle
Galvanneal Steel Dull Gray Matte
Galvalume Smooth Matte Spangle
Weldability
Galvanized Steel Less Weldable
Galvanneal Steel Ideal for Spot Welding
Galvalume Less Weldable
Paintability
Galvanized Steel High (Not Necessary)
Galvanneal Steel Higher
Galvalume High (Not Necessary)
In conclusion, each of these products has unique properties and advantages, making them suitable for different applications. Galvanized coating is affordable and easy to apply, making it a popular choice for outdoor or electrical applications. Galvalume provides excellent corrosion resistance, making it suitable for harsh environments. Galvanneal provides superior paint adhesion, making it an excellent choice for applications where the steel will be painted. Understanding the differences between these products can help you choose the right product for your specific needs.
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Since 1998, Online Metals has expanded our catalog to over 85,000 different cut sizes, grown our national footprint to seven pickup locations across the U.S., and continued to improve upon our best-in-class customer experience.
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