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| About Zinc Metallizing Zinc Metallizing is a thermal spray application of a zinc and aluminum coating applied to steel. The gas flame bonding of the zinc to the grit blasted steel is needed to remove any rust or mill scale and prepare the steel for proper adhesion of the zinc. This process protects the steel from corrosion for decades longer than paint alone. This process has been used around the world for 90 years. Steel of every shape and size may be metallized either before or after installation. Zinc Metallizing process The metallizing process always begins with proper surface preparation. Next, aluminum wire or zinc wire is continuously melted in an electric arc spray or gas flame spray gun. Droplets of molten metal from the wire are deposited onto the steel forming the protective coating. This sprayed metal coating is both a barrier coating and a galvanic coating in one. A single metallized coating protects steel for 30 years or longer depending upon the application, coating thickness and sealing. Metallizing is the most effective, long lasting protective coating available today. A metallized coating can outlast paint by a factor of more than two to one. Aluminum versus Zinc Wire Sprayed aluminum is preferred for use in industrial environments, especially where there are high concentrations of sulfur dioxide and other pollutants. Zinc provides greater galvanic protection than aluminum and protects gaps in the coating better than pure aluminum. Zinc-Aluminum Wire (85/15) At Avant Guards Coatings, we use Zinc-Aluminum Wire (85/15), which combines the benefits of pure zinc with the benefits of pure aluminum in the metallized coating. It is very often used as a substitute for pure zinc because it is somewhat more chloride and sulfur dioxide resistant than pure zinc, while retaining the greater electro-chemical activity of pure zinc. In the case of structural steel, with a ten-year inspection cycle and minor periodic maintenance by re-sealing, a sprayed metal coating can provide an indefinitely long service life well in excess of 30 years. When maintenance is finally required, it may not be necessary to completely remove an intact metallized coating by abrasive blasting. More About Zinc Metallizing
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A DIVISION OF AVANT GUARDS MANUFACTURING
232 Varet Street Brooklyn, New York 11206 Phone: 718.366.6565 Fax: 718.3660010 info@avantguards.com