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| Galvanized (zinc coated) |
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Galvanized (zinc-coated) steel is produced with a coating weight of 610 g/m2 (2 oz/ft2) of surface (total both sides) to provide zinc coating thickness of 43 µm (0.0017in.) on each surface. Zinc corrodes much more slowly than steel in natural environments and it galvanically protects steel at small discontinuities in the coating. Its excellent resistance to corrosion is due to the formation of protective films on zinc during exposure. On the average, the rate of attack of zinc is approximately 1/25 that of steel in most atmospheres and various waters. High corrosion rates in strongly acidic and strongly alkaline solutions can be attributed to the absence of film on the metal surface (stable films are present on the surface when the corrosion rates are low). |
