Composition and method for inhibiting corrosion and scale

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United States of America Patent

PATENT NO 11085118
APP PUB NO 20170306506A1
SERIAL NO

15634416

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Abstract

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A composition and method of inhibiting corrosion, white rust, and scale formation on components in a water system. The composition preferably comprises an amino-acid based polymer (most preferably a polyaspartic acid or a salt thereof), hydroxyphosphonoacetic acid, and a second phosphonic acid (preferably a phosphonocarboxylic acid), and does not require the use of regulated metals. The composition is effective even in the presence of biocides. A preferred method of inhibiting white rust comprises adding an amino-acid based polymer or hydroxyphosphonoacetic acid or both to the water system. A preferred method of inhibiting corrosion, white rust, and scale formation comprises adding an amino-acid based polymer, hydroxyphosphonoacetic acid, and a phosphonocarboxylic acid to the water system. Preferably the active concentrations are at least 3 ppm each of the amino-acid based polymer and hydroxyphosphonoacetic acid when added to a volume of water in the water system.

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Patent Owner(s)

  • NCH CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Drewniak, Marta Carrollton, US 8 51
Steimel, Lyle H Flower Mound, US 17 218

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