Additive for corrosion control

Abstract

An additive comprising tris (2-carboxyethyl) phosphine (“TCEP”) and/or tris (3-hyroxypropyl) phosphine (“THPP”) may be added to an aqueous system in an effective amount to inhibit corrosion of the metallurgy within the aqueous system, wherein the additive may be in the form of a solution and maintains its stability and effectiveness in inhibiting corrosion in a wide range of temperature, pressure, and pH conditions of the aqueous system.

What is claimed is: 
     
         1 . A method for inhibiting corrosion upon metallurgy in contact with an aqueous system comprising:
 introducing an additive comprising tris (2-carboxyethyl) phosphine (“TCEP”) and/or tris (3-hyroxypropyl) phosphine (“THPP”) to the aqueous system in contact with the metallurgy, the amount of the additive being effective to inhibit corrosion of the metallurgy within the aqueous system.   
     
     
         2 . The method of  claim 1 , wherein the amount of TCEP and/or THPP present in the additive ranges from about 10 wt. % to about 15 wt. %. 
     
     
         3 . The method of  claim 1 , wherein the additive is in the form a solution. 
     
     
         4 . The method of  claim 3 , wherein solution contains a solvent selected from a group consisting of water, methanol, propanol, ethylene glycol, and combinations thereof. 
     
     
         5 . The method of  claim 1 , wherein the effective amount of the additive ranges from about 5 ppm to about 50,000 ppm based on a total volume of fluid in the aqueous system. 
     
     
         6 . The method of  claim 1 , wherein the aqueous system is selected from the group consisting of an aqueous fluid, a hydrocarbon fluid containing water, a cooling tower, a cooling water system, a wastewater treatment system, and combinations thereof. 
     
     
         7 . The method of  claim 1 , wherein the aqueous system further comprises at least one additional component selected from the group consisting of a scale dissolver, a biocide, a chlorine-containing component, a surfactant, a dispersant, a passivator, and combinations thereof. 
     
     
         8 . The method of  claim 1 , wherein the aqueous system has a pH from about 1.5 to about 9. 
     
     
         9 . A treated aqueous system comprising:
 an aqueous system in contact with metallurgy; and   an effective amount of additive comprising TCEP and/or THPP, the amount of the additive being effective to inhibit corrosion of the metallurgy contacting the aqueous system.   
     
     
         10 . The treated aqueous system of  claim 9 , wherein the effective amount of the additive ranges from about 5 ppm to about 10,000 ppm based on the total volume of fluid in the aqueous system. 
     
     
         11 . The treated aqueous system of  claim 10 , wherein the effective amount of the additive ranges from about 10 ppm to about 600 ppm based on the total volume of fluid in the aqueous system. 
     
     
         12 . The treated aqueous system of  claim 9 , wherein the additive is in the form of a solution. 
     
     
         13 . The treated aqueous system of  claim 12 , wherein the amount of TCEP and/or THPP in the solution ranges from about 10% to about 15% based on a total volume of fluid in the additive solution. 
     
     
         14 . The treated aqueous system of  claim 9 , wherein the aqueous system is selected from the group consisting of an aqueous fluid, a hydrocarbon fluid containing water, a cooling tower, a cooling water system, a wastewater treatment system, and combinations thereof. 
     
     
         15 . The treated aqueous system of  claim 9 , wherein the aqueous system further comprises at least one additional component selected from the group consisting of a scale dissolver, a biocide, a chlorine-containing component, a surfactant, a dispersant, a passivator, and combinations thereof. 
     
     
         16 . The treated aqueous system of  claim 15 , wherein the surfactant is selected from the group consisting of a nonionic surfactant, a cationic surfactant, an anionic surfactant, a zwitterionic surfactant, and combinations thereof. 
     
     
         17 . The treated aqueous system of  claim 15 , wherein the passivator is selected from a group consisting of nitrite, polyhydroxycarboxylic acid, polyhydroxycarboxylic acid salt, and combinations thereof. 
     
     
         18 . The treated aqueous system of  claim 15 , wherein the biocide is selected from a group consisting of sodium hypochlorite, NaHClO, chlorine dioxide, chlorine, bromine, a non-oxidizing biocide, and combinations thereof. 
     
     
         19 . The treated aqueous system of  claim 15 , wherein the scale dissolver is selected from a group consisting of hydrochloric acid, sulfuric acid, and combinations thereof. 
     
     
         20 . The treated aqueous system of  claim 9 , wherein the aqueous system has a pH greater than about 7.5.