US2007187646A1PendingUtilityA1

Surface-active amines and methods of using same to impede corrosion

49
Individually held — no corporate assignee on recordPriority: Feb 16, 2006Filed: Feb 16, 2006Published: Aug 16, 2007
Est. expiryFeb 16, 2026(expired)· nominal 20-yr term from priority
Inventors:Billy D. Fellers
F28F 19/00C23F 14/02C23F 11/141
49
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Claims

Abstract

Surface-active amines that impede corrosion on metal surfaces in industrial or other systems, corrosion resistant apparatuses comprising the amines, methods of identifying surface-active amines that impede corrosion by using electrochemical quartz microbalance (EQCM), and methods of using the surface-active amines in industrial or other systems are disclosed.

Claims

exact text as granted — not AI-modified
1 . An apparatus that resists corrosion comprising: 
 a metal surface or component which is in the presence of a surface-active amine, said surface-active amine having a pKa of about 8 to about 14 at 25° C., and said surface-active amine having a molecular weight of less than about 1500.    
   
   
       2 . The apparatus of  claim 1 , wherein the at least one surface-active amine is characterized by an ability to impede corrosion on the surface of a metal in a solution buffered at a predetermined pH.  
   
   
       3 . The apparatus of  claim 1 , wherein the surface active amine is a di-azabicylo or tri-azabicyclo compound.  
   
   
       4 . The apparatus of  claim 1 , wherein the at least one surface-active amine promotes conversion of ferrous ion to ferric ion.  
   
   
       5 . The apparatus of  claim 1 , wherein the surface-active amine inhibits the corrosion of the metal component by chemisorption without pH effect.  
   
   
       6 . The apparatus of  claim 1 , wherein the at least one surface-active amine is in the presence of a trace amount of oxygen.  
   
   
       7 . The apparatus of  claim 1 , wherein the surface-active amine has a pKa of about 8 to about 14 at 25° C.  
   
   
       8 . The apparatus of  claim 1 , wherein the surface-active amine has a molecular weight of less than about 500.  
   
   
       9 . The apparatus of  claim 1 , wherein the surface-active amine has a molecular weight of less than about 250.  
   
   
       10 . The apparatus of  claim 1 , wherein the at least one surface-active amine is DBU (1,8-diazabicyclo[5.4.0]undec-7-ene).  
   
   
       11 . The apparatus of  claim 1 , wherein the metal surface or component comprises steel, iron, nickel, copper, chromium, aluminum or combinations thereof.  
   
   
       12 . The apparatus of  claim 1 , wherein the metal surface or component comprises steel.  
   
   
       13 . The apparatus of  claim 1 , wherein the metal surface or component comprises low carbon steel.  
   
   
       14 . A composition comprising: 
 at least one surface-active amine that impedes corrosion on the surface of a metal in a solution buffered at a predetermined pH having a pKa of about 8 to about 14 at 25° C. and a molecular weight of less than to about 1500; and    at least one compound selected from the group consisting of dimethylamine (DMA), hydrozine, morpholine and combinations thereof.    
   
   
       15 . The composition of  claim 14 , wherein the surface active amine is a di-azabicylo or tri-azabicyclo compound.  
   
   
       16 . The composition of  claim 14 , wherein the at least one surface-active amine promotes conversion of ferrous ion to ferric ion.  
   
   
       17 . The composition of  claim 14 , wherein the surface-active amine impedes the corrosion of the metal component by chemisorption without pH effect.  
   
   
       18 . The composition of  claim 14 , wherein the at least one surface-active amine combines with a trace amount of oxygen to form an amine-oxygen complex.  
   
   
       19 . The composition of  claim 14 , wherein the surface-active amine has a pKa of about 8 to about 12 at 25° C.  
   
   
       20 . The composition of  claim 14 , wherein the surface-active amine has a molecular weight of less than about 500.  
   
   
       21 . The composition of  claim 14 , wherein the surface-active amine has a molecular weight of less than about 250.  
   
   
       22 . The composition of  claim 14 , wherein the at least one surface-active amine is DBU (1,8-diazabicyclo[5.4.0]undec-7-ene).  
   
   
       23 . The composition of  claim 14 , wherein the composition additionally comprises a trace amount of oxygen.  
   
   
       24 . The composition of  claim 14 , wherein the composition additionally comprises deionized water having an electrolyte content of less than about 500 ppm.  
   
   
       25 . The composition of  claim 14 , wherein the metal surface comprises steel, iron, nickel, copper, chromium, aluminum or a combination thereof.  
   
   
       26 . The composition of  claim 14 , wherein the metal surface comprises steel.  
   
   
       27 . The composition of  claim 14 , wherein the metal surface comprises low carbon steel.  
   
   
       28 . A composition comprising: 
 an effective amount of at least one surface-active amine having a pKa of about 8 to about 14 at 25° C., and a molecular weight of less than about 1500;    a trace amount of oxygen in contact with said surface-active amine; and    deionized water having an electrolyte content of less than about 500 ppm.    
   
   
       29 . The composition of  claim 28 , wherein the surface active amine is a di-azabicylo or tri-azabicyclo compound.  
   
   
       30 . The composition of  claim 28 , wherein the at least one surface-active amine is DBU (1,8-diazabicyclo[5.4.0]undec-7-ene).  
   
   
       31 . A method of identifying a composition effective at impeding corrosion of metal components comprising: 
 measuring with an Electronic Quartz Crystal Microbalance (EQCM) the weightloss of a metal deposit treated with a candidate amine in a solution buffered at a predetermined pH.    
   
   
       32 . The method of  claim 31 , wherein the buffered solution is selected from the group consisting of borate, phosphate and combinations thereof.  
   
   
       33 . The method of  claim 31 , wherein the metal deposit comprises steel, iron, nickel, copper, chromium, aluminum or a combination thereof.  
   
   
       34 . A method of impeding corrosion comprising: 
 adding at least one surface-active amine to at least one surface of a metal component or to a substance in contact with at least one surface of a metal component, said at least one surface-active amine having a pKa of about 8 to about 14 at 25° C., and a molecular weight of less than about 1500.    
   
   
       35 . The method of  claim 34 , wherein the surface active amine is a di-azabicylo or tri-azabicyclo compound.  
   
   
       36 . The method of  claim 34 , wherein the at least one surface-active amine promotes conversion of ferrous ion to ferric ion.  
   
   
       37 . The method of  claim 34 , wherein the surface-active amine impedes the corrosion of the metal component by chemisorption without pH effect.  
   
   
       38 . The method of  claim 34 , wherein the at least one surface-active amine combines with a trace amount of oxygen to form an amine-oxygen complex.  
   
   
       39 . The method of  claim 34 , wherein the surface-active amine has a pKa of about 8 to about 12 at 25° C.  
   
   
       40 . The method of  claim 34 , wherein the surface-active amine has a molecular weight of less than about 500.  
   
   
       41 . The method of  claim 34 , wherein the surface-active amine has a molecular weight of less than about 250.  
   
   
       42 . The method of  claim 34 , wherein the at least one surface-active amine is DBU (1,8-diazabicyclo[5.4.0]undec-7-ene).  
   
   
       43 . The method of  claim 34 , wherein at least one additional agent is added to the at least one surface of a metal component or the substance in contact with the at least one surface of a metal component.  
   
   
       44 . The method of  claim 43 , wherein the at least one additional agent is dimethylamine (DMA), hydrozine, morpholine or a combination thereof.  
   
   
       45 . The method of  claim 43 , wherein the surface-active amine is DBU (1,8-diazabicyclo[5.4.0]undec-7-ene); and wherein dimethylamine (DMA), hydrozine, morpholine or a combination thereof is added to the at least one surface of a metal component or the substance in contact with the at least one surface of a metal component.  
   
   
       46 . The method of  claim 34 , wherein the metal component comprises steel, iron, nickel, copper, chromium, aluminum or a combination thereof.  
   
   
       47 . The method of  claim 34 , wherein the metal component comprises steel.  
   
   
       48 . The method of  claim 34 , wherein the metal component comprises low carbon steel.  
   
   
       49 . A method of impeding corrosion in a steam generating system comprising: 
 adding at least one surface-active amine to feed water in the steam generating system, said at least one surface-active amine having a pKa of about 8 to about 14 at 25° C., and a molecular weight of less than about 1500.    
   
   
       50 . The method of  claim 49 , wherein the surface-active amine is DBU (1,8-diazabicyclo[5.4.0]undec-7-ene).  
   
   
       51 . The method of  claim 50 , additionally comprising adding dimethylamine (DMA), hydrozine, morpholine or a combination thereof to the feed water.  
   
   
       52 . The method of  claim 50 , wherein the concentration of DBU in the feed water is at least 1 ppm.  
   
   
       53 . The method of  claim 50 , wherein the concentration of DBU in the feed water is at least 2 ppm.  
   
   
       54 . The method of  claim 50 , wherein the concentration of DBU in the feed water is about 10 ppm to 10,000 ppm.  
   
   
       55 . The method of  claim 50 , wherein the DBU is distributed into the steam phase of the secondary cycle of the steam generating system.  
   
   
       56 . A method of preparing a corrosion resistant apparatus for use in a system comprising: 
 adding at least one surface-active amine to at least one surface of a metal component.

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