1187Nonmetallic Barrier Coatings

Barrier coatings act, as their name suggests, by providing a barrier between the metal substrate and the environment. Barrier coatings may be found in the form of organic paints, enamels, varnishes and lacquers. Paints are by far the most common barrier coating in existence today, consisting essentially of three components: a solvent (organic or water based) providing fluidity, a pigment suspended in the solvent, and additives that promote drying and can provide additional properties. It has been estimated that over 50% of all metal surfaces for which an impervious, pore-free, adherent and attractive property is required are treated with paints of one sort or another [56].

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