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US 4,066,398 AGranted
Corrosion inhibition
AssigneeChemed Corporation
InventorChih Ming Hwa
Life of this patent
Estimating the term…
Abstract
Corrosion inhibiting compositions containing hydroxyamine phosphate ester or water-soluble derivative thereof, together with water-soluble zinc salt and 1,2,3-triazole or water-soluble derivative thereof; and methods for inhibiting corrosion in aqueous systems therewith.
Claims5
A method for inhibiting corrosion of a metal surface consisting of a member of the group consisting of steel and aluminum, which consists of maintaining in an aqueous fluid in contact with said surface a corrosion inhibiting amount of a corrosion inhibiting composition consisting essentially of:
- a. water-soluble hydroxyamine phosphate ester, said amine phosphate ester comprising the reaction product of polyphosphoric acid, phosphorus pentoxide or a mixture of polyphosphoric acid and phosphorus pentoxide with a water-soluble hydroxyamine;
- b. sufficient water-soluble zinc compound to provide from 0.005 to 15 parts by weight of zinc ion for each part by weight of said phosphate ester;
- and
- c. sufficient water-soluble 1,2,3-triazole to provide from 0.005 to 15 parts by weight of said azole or azole derivative for each part by weight of said phosphate ester.
1 more element
Dependencies are inferred from the claim text.