Barrier coating

A coating that protects primarily by impermeability, isolating the substrate from water, oxygen and dissolved ions rather than by galvanic or inhibitive action. High build epoxies and coatings pigmented with lamellar materials such as micaceous iron oxide or glass flake are typical examples.

Related terms

Micaceous iron oxide

MIO

A naturally occurring lamellar form of iron oxide used as a flake pigment in intermediate and finish coats of heavy duty protective paints. The overlapping flakes align parallel to the surface, lengthening the path for moisture penetration and shielding the binder from ultraviolet light.

Coatings & protectionConstructionMarineIndustrial

Corrosion inhibitor

A chemical species that reduces the corrosion rate of a metal when present in relatively small amounts, either dosed into the surrounding environment, for example in cooling water systems, or incorporated as inhibitive pigments within a primer.

Coatings & protectionAerospaceAutomotiveConstructionMarineGreen energyIndustrial

Fusion bonded epoxy

FBE

A thermosetting epoxy powder coating applied electrostatically to preheated steel, on which it melts, flows and cures to form a continuous film. It is a standard factory applied coating for buried and subsea pipelines and for corrosion protected reinforcing bar.

Coatings & protectionManufacturing processesConstructionMarineGreen energyIndustrial

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