State of the Art

There are two basic types of preconstruction primer: those relying on the high adhesion and chemical resistance properties of the binding media (two-pack epoxies are typical) that may contain inhibitive pigments such as zinc phosphate; and primers pigmented with metallic elements anodic to steel (most commonly zinc), which provide cathodic protection even when a break in the coating exposes the steel, actually preventing steel corrosion and underrusting of the primer until the anodic metal is exhausted.
However, it is not easy to create a competitive preconstruction primer as it must provide several fundamental requirements including:

  • Protecting the steel plate against corrosion during storage and fabrication (welding, cutting, drilling);

  • Acting as the first layer for the subsequent painting of the structure;

  • Not giving off an excessive amount of gas during welding and cutting;

  • Having sufficient thermal stability so as not to degrade when exposed to welding and cutting high temperatures;

  • Providing ease of application, quick drying, wear and scratch resistance, bending flexibility and so on.

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Typical coating for steel substrate