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Zinc spray, which is also referred to as metallizing, is done by melting zinc powder or zinc wire in a flame or electric arc and projecting the molten zinc droplets by air or gas onto the surface to be coated. The zinc used is nominally 99.5% pure or better and the corrosion resistance of the coating produced by this technique is approximately equal to the hot-dip galvanized coating.

The renovated area shall have a zinc coating thickness at least as thick as that specified in A123/A123M for the thickness grade required for the appropriate material category. For best results, thickness measurements for the metallized coating should be taken with either a magnetic or an electromagnetic gauge. 

See Also:
The Inspection of Hot-Dip Galvanized Steel Products

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