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Non-Toxic Corrosion Inhibitor

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Non-Toxic Corrosion Inhibitor
l Patent No. U.S. 6,503,305
Hammond Group, Inc. has been granted a patent for a non-toxic chemical composition that inhibits corrosion in metal substrates. The composition contains a phosphorus compound comprised of an acid and a metal selected from the group consisting of an alkali, alkaline earth or transition metal. The composition also contains a boron compound comprising an acid and a metal selected from the group consisting of an alkali, alkaline earth, or transition metal. The process of making the chemical composition comprises the steps of filling a mixer with 30-60% by weight of hot water and adding 10-20% by weight of barium carbonate or strontium carbonate, 10-20% by weight of phosphoric acid (75%), 5-15% by weight of lime, and 10-20% by weight of boric acid; mixing the contents for 10-15 minutes to create a wet slurry; pouring the wet slurry into an attrition mill for 15-60 minutes; drying the wet slurry and milling it to an average particle size of one to two microns to form a dry pigment; and pushing the dry pigment through a 325 mesh sieve.

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