If you handle a lot of galvanized steel products, you may have noticed a powder-like substance called white rust which can develop on the surface of the material. Also known as wet storage stain, it can appear as black spots initially and affect the appearance of the metal as it deteriorates. Your local steel supplier can inform you of best practices when buying and handling galvanized steel. The guide below describes the causes of white rust and how to prevent it.

What Is White Rust?

Visible as a chalky, white coating on the surface of galvanized steel and other zinc-coated metal materials, white rust is a type of corrosion that occurs when the metal is stored in a wet environment and exposed to oxygen and hydrogen. It’s a common problem for galvanized steel that is stored improperly, causing condensation to form and become trapped between the metal.

Is White Rust Harmful To Metal?

The zinc coating applied to galvanized steel is intended to act as a protective coating to prevent the steel below from oxidizing. When white rust forms, it can cause the coating to become weak and flake off, leaving the steel below exposed to the elements.

How Do You Prevent White Rust?

There are several ways to prevent white rust formation. Steel suppliers recommend eliminating water exposure and condensation in areas where your steel is stored. You should increase the airflow in your facility and control the humidity level by using a cooling system along with dehumidifiers. Additionally, cold zinc coated materials should never be brought into a warm environment; this can cause condensation to form on the metal and lead to white rust.

When you need a dependable steel supplier, trust the team at Incom in Kailua Kona, HI. They provide a wide range of metal fabrication services including custom truck racks, pipe fittings, and handicap railings. For information on high-quality welding or steel products, call them today at (808) 329-1311 to discuss their offerings. You can also visit the steel supplier online to learn more about their services.