Corrosion Inhibiting Composition For Non-Ferrous Metals

Abstract

The invention relates an additive composition for use as a metal working fluid and a process for protection of metals, particularly zinc or aluminum, against corrosion or oxidative degradation. The composition comprises an additive mixture of an alkenyl succinic half ester, a substituted imidazoline compound and amine phosphate partial ester in a functional fluid.

1 . A composition, which comprises
 A) An additive mixture that essentially consists of   a) At least one alkenyl succinic half ester of the formula   
     
       
         
         
             
             
         
       
       Wherein R 1  represents C 6 -C 18 Alkenyl, R 2  represents hydrogen or methyl and n is a numeral from 1 to 100; 
       b) At least one imidazoline compound of the formula 
     
     
       
         
         
             
             
         
       
       Wherein one of R 1  and R 2  represents hydrogen and the other one represents a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl and C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl; or Wherein both of R 1  and R 2  represent substituents selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl and C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl; and 
       c) At least one amine phosphate partial ester of the formula 
     
     
       
         
         
             
             
         
       
       Wherein m represents 1 or 2; 
       n represents 2, if m represents 1, or represents 1, if m represents 2; 
       R represents a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl, C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl, C 4 -C 8 cycloalkyl, C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl, C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl and C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl; and 
       R a , R b , R c  and R d  independently of one another represent hydrogen or a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl, C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl, C 4 -C 8 cycloalkyl, C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl, C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl and C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl; and 
       B) A functional fluid. 
     
   
   
       2 . A composition according to  claim 1 , which comprises
 A) An additive mixture that essentially consists of   a) At least one alkenyl succinic half ester (I), wherein   R 1  represents C 10 -C 16 alkenyl, R 2  represents methyl and n is a numeral from 1 to 20;   b) At least one imidazoline compound (II),   Wherein one of R 1  and R 2  represents hydrogen and the other one represents a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl and C 12 -C 18 alkenyl; or   Wherein both of R 1  and R 2 represent substituents selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl and C 12 -C 18 alkenyl; and   c) At least one amine phosphate partial ester (Ill),   Wherein m represents 1 or 2;   n represents 2, if m represents 1, or represents 1, if m represents 2;   R represents a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl and amino-C 2 -C 12 alkyl; and   R a , R b , R c  and R d  independently of one another represent hydrogen or a substituent selected from the group consisting of C 1 -C 12 alkyl and hydroxy-C 2 -C 12 alkyl; and   B) A functional fluid.   
   
   
       3 . A composition according to  claim 1 , which comprises
 A) An additive mixture that essentially consists of   a) At least one alkenyl succinic half ester (I), wherein   R 1  represents C 12 -C 16 alkenyl, R 2  represents methyl and n is a numeral from 1 to 20;   b) At least one imidazoline compound (II),   Wherein one of R 1  and R 2  represents hydrogen and the other one represents a substituent selected from the group consisting of C 1 -C 12 alkyl and C 12 -C 18 alkenyl; or   Wherein both of R 1  and R 2  represent substituents selected from the group consisting of C 1 -C 12 alkyl and C 12 -C 18 alkenyl; and   c) At least one amine phosphate partial ester (III),   Wherein m represents 1 or 2;   n represents 2 if m represents 1; or   represents 1 if m represents 2; and   R represents a substituent selected from the group consisting of C 1 -C 12 alkyl and hydroxy-C 2 -C 12 alkyl; and   R a , R b , R c  and R d  independently of one another represent hydrogen or a substituent selected from the group consisting of C 1 -C 12 alkyl and hydroxy-C 2 -C 12 alkyl; and   B) A functional fluid.   
   
   
       4 . A composition, which comprises
 a) At least one alkenyl succinic half ester   
     
       
         
         
             
             
         
       
       Wherein R 1  represents C 6 -C 18 alkenyl, R 2  represents methyl and n is a numeral from 1 to 100; 
       b) At least one imidazoline compound 
     
     
       
         
         
             
             
         
       
       Wherein one of R 1  and R 2  represents hydrogen and the other one represents a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl and C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl; or 
       Wherein both of R 1  and R 2  represent substituents selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl and C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl; 
       c) At least one amine phosphate partial ester 
     
     
       
         
         
             
             
         
       
       Wherein m represents 1 or 2; 
       n represents 2 if m represents 1; or 
       represents 1 if m represents 2; and 
       R represents a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl, C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl, C 4 -C 8 cycloalkyl, C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl, C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl and C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl; and 
       R a , R b , R c  and R d  independently of one another represent hydrogen or a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl, C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl, C 4 -C 8 cycloalkyl, C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl, C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl and C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl; and 
       d) Additional customary additives. 
     
   
   
       5 . An additive mixture that essentially consists of
 a) At least one alkenyl succinic half ester   
     
       
         
         
             
             
         
       
       Wherein R 1  represents C 6 -C 18 alkenyl, R 2  represents hydrogen or methyl and n is a numeral from 0 to 100; 
       b) At least one imidazoline compound 
     
     
       
         
         
             
             
         
       
       Wherein one of R 1  and R 2  represents hydrogen and the other one represents a substituent selected from the group consisting of C 1 -C 12 alkyl; hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl and C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl; or 
       Wherein both of R 1  and R 2  represent substituents selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl and C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl; and 
       c) At least one amine phosphate partial ester 
     
     
       
         
         
             
             
         
       
       Wherein m represents 1 or 2; 
       n represents 2 if m represents 1; or 
       represents 1 if m represents 2; and 
       R represents a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl, 
       C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl, C 4 -C 8 cycloalkyl, C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl, C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl and C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl; and 
       R a , R b , R c  and R d  independently of one another represent hydrogen or a substituent selected from the group consisting of C 1 -C 12 alkyl, hydroxy-C 2 -C 12 alkyl, amino-C 2 -C 12 alkyl, C 2 -C 20 alkenyl, phenyl, phenyl-C 1 -C 4 alkyl, C 1 -C 4 alkylphenyl, C 1 -C 4 alkylphenyl-C 1 -C 4 alkyl, C 4 -C 8 cycloalkyl, C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl, C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl and C 1 -C 4 alkyl-C 4 -C 8 cycloalkyl-C 1 -C 4 alkyl. 
     
   
   
       6 . A metal working fluid comprising the additive mixture according to  claim 5 . 
   
   
       7 . A composition according to  claim 1 , wherein the functional fluid B) is a non-aqueous functional liquid selected from the group consisting of lubricants, hydraulic fluids, metal working fluids, engine coolants, transformer oils and switch gear oils. 
   
   
       8 . A process for protection against corrosion or oxidative degradation of metals, wherein the metal is exposed to a functional fluid comprising the additive mixture according to  claim 5 . 
   
   
       9 . A process for protection against corrosion or oxidative degradation of zinc, aluminum or alloys thereof, or zinc-coated steels, wherein zinc, aluminum or alloys thereof are exposed to a functional fluid comprising the additive mixture according to  claim 5 . 
   
   
       10 . A process for protection against corrosion or oxidative degradation of zinc, aluminum or alloys thereof, or zinc-coated steels, wherein zinc, aluminum or alloys thereof are exposed to a functional fluid comprising at least one alkenyl succinic half ester of the formula 
     
       
         
         
             
             
         
       
       Wherein R 1  represents C 6 -C 18 alkenyl, R 2  represents hydrogen or methyl and n is a numeral from 1 to 100.