Powder coating

Powder coating is a dry finishing process used to apply a protective and decorative layer to metals, which is highly relevant as a secondary coating over galvanized steel pipes.

Process and Purpose

The process involves electrostatically charging a free-flowing, dry powder (typically a thermoset polymer like polyester or epoxy) and spraying it onto the grounded steel pipe. The electric charge holds the powder to the surface. The pipe is then heated in a curing oven, causing the powder to melt, flow out, and chemically react to form a highly durable, solid "skin."

When applied over a galvanized surface, this forms a Duplex System. The powder coat acts as an impermeable barrier (Layer 2), significantly slowing down corrosion rates compared to galvanized steel alone (Layer 1). This combination offers unparalleled durability, excellent aesthetic finish, and extends the product's service life dramatically, making it ideal for high-exposure structural and architectural tubing.