Compositions – Preservative agents – Anti-corrosion
Patent
1991-05-31
1992-12-15
Stoll, Robert L.
Compositions
Preservative agents
Anti-corrosion
252392, 25238962, 252180, 210700, C23F 11167, C23F 1114
Patent
active
051714779
ABSTRACT:
The present invention is directed to a method of inhibiting corrosion in aqueous systems which employ amino acid chelants in concentrations which are corrosive to the metal surfaces in contact with the aqueous system. The method comprises adding to the system a corrosion inhibiting amount of 1-hydroxyethane-1,1-diphosphonic acid (HEDPA). The corrosion inhibiting amount is generally in the range of from 0.5% to 10% on the basis of the concentration of amino acid chelant in the system.
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The Nalco Water Handbook 2nd edition, section 3.20, 1988.
Betz Handbook of Industrial Water Conditioning eighth edition 1980, p. 108.
Alkyl Phosphonates as Inhibitors for Metal Corrosion in Detergents Containing Chelating Agents; Hellsten et al, Tenside Detergents, 8(5) p. 237-247 (1971).
Chemical Abstracts (40) 3212, "Method of Treating Boilers" (for scale-removal and prevention) (Bersworth).
Barr James P.
Fee Valiri
Stoll Robert L.
W. R. Grace & Co.,-Conn.
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