Duplex coating system

A corrosion protection system in which hot-dip galvanised steel is overcoated with paint or powder coating. The organic coating protects the zinc and the zinc protects the steel at any damage, so a well designed duplex system generally lasts longer than either coating used alone.

Also known as: duplex system

Related terms

Hot-dip galvanising

HDG

The process of coating steel or iron with zinc by immersion in a bath of molten zinc, forming metallurgically bonded zinc-iron alloy layers with an outer zinc surface. The coating protects both as a barrier and sacrificially, continuing to protect the steel at small areas of damage.

Coatings & protectionManufacturing processesConstructionAutomotiveMarineGreen energyIndustrial

Powder coating

A dry finishing process in which electrostatically charged powder, commonly polyester, epoxy or hybrid chemistry, is sprayed onto an earthed component and then fused and cured in an oven to form a continuous film. The process is essentially solvent free and allows overspray to be recovered and reused.

Coatings & protectionManufacturing processesConstructionAutomotiveIndustrialGreen energy

Primer

A preparatory coating applied to a substrate before an adhesive, sealant, coating or waterproofing membrane, improving adhesion by sealing porosity, binding dust or providing a chemically compatible surface. Primer selection depends on both the substrate and the product to be applied over it.

Resins & adhesivesCoatings & protectionRoofing & waterproofingAerospaceAutomotiveConstructionMarineGreen energyIndustrial

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