Reaction product of nitrogen bases and phosphate esters as corrosion inhibitors

Abstract

A method for inhibiting corrosion of metal surfaces in an aqueous medium, comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR1## compositions of the formula ##STR2## and mixtures thereof, wherein R is R 2 .paren open-st.OCH 2 CH 2 .paren close-st. x , wherein R 2 is a substituted or unsubstituted alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from about one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible.

What is claimed is: 
     
       1. A method for inhibiting corrosion of ferrous metal surfaces in an aqueous medium . .containing.!. .Iadd.contacting or to contact .Iaddend.at least one of living Skeletonema costatum or living fish, the method comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion of ferrous metal surfaces in the medium, the corrosion inhibitor . .having a BOD-28 of at least about 70% in the medium.!. .Iadd.having an EC 50  for Skeletonema costatum of at least about 1 ppm by weight .Iaddend.and comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR13## compositions of the formula ##STR14## and mixtures thereof, wherein R is . .R 2  --OCH 2  CH 2  -- x  .!..Iadd.R 2  .paren open-st.OCH 2  CH 2  .paren close-st. x  .Iaddend., wherein R 2  is an alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible. 
     
     
       2. A method as set forth in claim 1 wherein the agent is a composition of the formula ##STR15## wherein R and R'N are defined in claim 1. 
     
     
       3. A method as set forth in claim 2 wherein R 2  is an unsubstituted alkyl group. 
     
     
       4. A method as set forth in claim 3 wherein the basic nitrogen compound is a compound of the formula ##STR16## 
     
     
       5. A method as set forth in claim 3 wherein x is from about two to about five. . .6. A method as set forth in claim 1 wherein the corrosion inhibitor has an EC 50  for Skeletonema costatum of at least about 1 
     
     
        ppm by weight..!.7. A method as set forth in claim . .6.!. .Iadd.1 .Iaddend.wherein the corrosion inhibitor further has a partitioning less than about three, a YL of, at most, about three and a flash point greater 
     
     
        than about 56° C. 8. A method as set forth in claim 1 wherein the 
     
     
        medium contains fish. 9. A method as set forth in claim 1 wherein R 2  is an unsubstituted alkyl, aryl or aralkyl group of from about five to 
     
     
        about fifteen carbon atoms. 10. A method for inhibiting corrosion of ferrous metal surfaces in an aqueous medium . .containing.!. .Iadd.contacting or to contact .Iaddend.at least one of living Skeletonema costatum or living fish, the method comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion of ferrous metal surfaces in the medium, the corrosion inhibitor . .having a BOD-28 of at least about 70% in the medium.!. .Iadd.having an EC 50  for Skeletonema costatum of at least about 1 ppm by weight .Iaddend.and comprising the acid/base reaction product of a phosphate ester of the formula wherein R is R 2  .paren open-st.OCH 2  CH 2  .paren close-st. x , wherein R 2  is an alkyl, an aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from one to about ten, and a 
     
     
        basic nitrogen compound that is at least water-dispersible. 11. A method as set forth in claim 10 wherein the . .agent.!. .Iadd.reaction product .Iaddend.is a composition of the formula ##STR17## wherein . .R and R'N are defined in claim 8 where.!. R is defined as in 
     
     
        claim 8 and where R'N is a basic nitrogen compound. 12. A method as set 
     
     
        forth in claim 11 wherein R 2  is an unsubstituted alkyl group. 13. A method as set forth in claim 12 wherein the basic nitrogen compound is a compound of the formula ##STR18## 
     
     
       14. A method as set forth in claim 12 wherein x is from about two to about 
     
     
        five. 15. A method as set forth in claim 10 wherein the corrosion inhibitor has an EC 50  for Skeletonema costatum of at least about 1 
     
     
        ppm by weight. 16. A method as set forth in claim . .16.!. .Iadd.15 .Iaddend.wherein the corrosion inhibitor further has a partitioning less than about three, a YL of, at most, about three and a flash point greater 
     
     
        than about 56° C. 17. A method as set forth in claim 10 wherein the 
     
     
        medium contains fish. 18. A method as set forth in claim 10 wherein R 2  is an unsubstituted alkyl, aryl or aralkyl group of from about 
     
     
        five to about fifteen carbon atoms. .Iadd.19.  A method as set forth in claim 1 wherein said medium is free of Skeletonema costatum and living fish when said corrosion inhibitor is incorporated therein and is therafter contacted with Skeletonema costatum or living fish. .Iaddend..Iadd.20. A method as set forth in claim 10 wherein said medium is free of Skeletonema costatum and living fish when said corrosion inhibitor is incorporated therein and is therafter contacted with Skeletonema costatum or living fish. .Iaddend..Iadd.21. A method for inhibiting corrosion of ferrous metal surfaces in an aqueous medium contacting or to contact at least one of living Skeletonema costatum or living fish, the method comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion of ferrous metal surfaces in the medium, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula compositions of the formula ##STR19## and mixtures thereof, wherein R is R 2  .paren open-st.OCH 2  CH 2  .paren close-st. x , wherein R 2  is an alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, provided that if R 2  is an alkyl, it is a straight chain alkyl, each carbon atom having at least one hydrogen and x is an integer of from one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible. .Iaddend..Iadd.22. A method as set forth in claim 21 wherein the agent is a composition of the formula ##STR20## wherein R and R'N are defined in claim 21. .Iaddend..Iadd.23. A method as set forth in claim 22 wherein R 2  is an unsubstituted straight chain alkyl group. .Iaddend..Iadd.24. A method as set forth in claim 23 wherein the basic nitrogen compound is a compound of the formula .Iaddend. ##STR21## 
     
     
       .Iadd.25.  A method as set forth in claim 23 wherein x is from about two to about five. .Iaddend..Iadd.26. A method as set forth in claim 21 wherein said medium is free of Skeletonema costatum and living fish when said corrosion inhibitor is incorporated therein and is therafter contacted 
     
     
        with Skeletonema costatum or living fish. .Iaddend..Iadd.27.  A method as set forth in claim 1 therein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.28. A method as set forth in claim 2 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.29. A method as set forth in claim 3 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. 
     
     
        .Iaddend..Iadd.30.  A method as set forth in claim 4 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.31. A method as set forth in claim 5 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.32. A method as set forth in claim 7 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.33. A method as set forth in claim 8 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.34. A method as set forth in claim 9 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.35. A method as set forth in claim 10 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.36. A method as set forth in claim 11 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. 
     
     
        .Iaddend..Iadd.7.  A method as set forth in claim 12 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.38. A method as set forth in claim 13 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.39. A method as set forth in claim 14 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.40. A method as set forth in claim 16 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.41. A method as set forth in claim 17 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend..Iadd.42. A method as set forth in claim 18 wherein the corrosion inhibitor has a BOD-28 of at least about 70% in the medium. .Iaddend.