Use of phosphino polymer and polyhydroxypolycarboxylic acid as corrosion inhibitor
AssigneeBaker Hughes, A Ge Company, LLC
InventorsMary Jane Legaspi Felipe, David N. Fulmer, Bing Bing Guo, Khac Truc Nguyen
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Abstract
A polyhydroxypolycarboxylic acid and a water soluble phosphino polycarboxylate may be added to an aqueous system, such as a cooling water system, in order to inhibit corrosion as well as the deposition of corrosion within the system. The water soluble phosphino polycarboxylate may be derived from a phosphinyl unsaturated monomer and an ethylenically unsaturated carboxylic acid monomer. The aqueous system may be a cooling water system such as a cooling tower, a closed cooling water system, an air-conditioning water systems, a wastewater treatment system as well as a deionized water production system.
Claims18
A method of inhibiting corrosion in a cooling water system comprising adding to the water system a corrosive inhibiting effective amount of a corrosion inhibitor system free of zinc salts, zinc oxides and zinc sulfates, the corrosion inhibitor system consisting essentially of:
- (a) a polycarboxylic acid selected from the group consisting of polyhydroxydicarboxylic acids, polyhydroxytricarboxylic acids or a mixture thereof;
- and
- (b) a water soluble phosphino polymer either (i) derived from a phosphinyl unsaturated monomer and an ethylenically unsaturated carboxylic acid or ester;
- or (ii) a polycarboxylic acid or polycarboxylate having at least one pendant phosphino group or a phosphino group within the backbone of the polymer.
A method of inhibiting the deposition of scales in a cooling water system comprising adding to the water system a scale inhibiting effective amount of a corrosion inhibitor system composed of only organic components, the corrosion inhibitor system consisting essentially of:
- (a) a polyhydroxypolycarboxylic acid selected from the group consisting of polyhydroxydicarboxylic acids, polyhydroxytricarboxylic acids or a mixture thereof;
- and
- (b) a water soluble phosphino polycarboxylate.
A method of inhibiting corrosion in a cooling water system comprising adding to the water system a corrosive inhibiting effective amount of a corrosion inhibitor system consisting essentially of:
- (a) a polyhydroxypolycarboxylic acid selected from the group consisting of polyhydroxydicarboxylic acids, polyhydroxytricarboxylic acids or a mixture thereof;
- and
- (b) a water soluble phosphino polymer.
Dependencies are inferred from the claim text.