Coated steels

To inhibit corrosion, steel may be coated with metallic or organic finishes. Metallic finishes are typically zinc (Z), zinc-iron alloy (ZF), zinc-aluminium alloy (ZA), aluminium-zinc alloy (AZ) and aluminium-silicon-alloy (AS) all of which may be applied by hot-dipping of steel into the molten metal. The degree of corrosion protection is directly related to the thickness of the metallic coating (BS EN 10326: 2004). Organic coatings (BS EN 10169: 2003) may be divided into liquid paints, powder coatings and films. Certain products are suitable only for interior applications.

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