Application industries

Galvanized steel weathers with a beautiful, protective patina over time, but many architects and designers want their steel to be colorful. Galvanizing steel ensures a long part life, and powder coating gives builders an extensive color palette. But powder coating is not a simple process.

What is Powder Coated Galvanized Steel?

A powder coat can be the second step in producing colorful galvanized steel. The powder coat is applied over hot dip galvanized steel at the galvanizing facility.

The first step in producing powder coated galvanized steel is galvanizing. The steel part is coated with a thin layer of molten zinc. The zinc serves as a barrier against the elements and as a cathode for the electrochemical processes that would otherwise oxidize the iron in the steel. Water and ionic compounds from the environment react with the zinc coating rather than with the steel beneath it. Hot dip galvanizing requires exceptional attention to details and rigorous procedures to ensure the product conforms to ASTM standards. It is important that the steel is not quenched with water or chromate solution.

The second step in producing powder coated galvanized steel is the application of the powder coat to the galvanized part. An even layer of polyester powder coating is applied to the recently galvanized steel and cured in a stove at 180° C.

Powder coatings must be applied within 12 hours of the galvanizing process. All surfaces must be clean and free from grease. Care must be taken in the powder coating process to avoid the formation of pinholes spots and uneven coating.

Advantages of Choosing Powder-Coated Galvanized Steel：

Why use both galvanizing and powder coating? This “duplex system” combines the strengths of each to maximize durability and corrosion resistance. Here’s how:

Enhanced Corrosion Resistance

Combining galvanization and powder coating provides superior protection, particularly in harsh or coastal environments.

Extended Lifespan

The American Galvanizers Association (AGA) and the Society for Protective Coatings (SSPC) indicate that this duplex process can extend a part’s lifespan up to two and a half times longer than using either coating alone.

Improved Aesthetic Appeal

Powder coating adds a uniform, attractive finish, available in various colors, enhancing the appearance of galvanized steel.

Lower Maintenance

The increased toughness lowers the need for regular upkeep, making it perfect for extended-use applications.

Cost Efficiency Over Time

While initial costs may be higher, the extended lifespan and reduced maintenance result in long-term savings.

How Long Does Powder-Coated Galvanized Steel Last?

Powder-coated galvanized steel can last 15-25 years or more, depending on exposure and maintenance, offering long-lasting protection in harsh environments.

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