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.
© 2020 American Galvanizers Association. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. The information provided herein is not intended as a representation or warranty on the part of the AGA. Anyone making use of this information assumes all liability arising from such use.