N-acyl amino acid as corrosion protection

Abstract

The present invention relates to a method of using N-acylamino acids or salts thereof to protect metal from corrosion, and to containers that at least in portions enclose a cavity, where the container comprises at least one metallic part and where a composition that encompasses at least one N-acylamino acid and water is arranged in the cavity.

What is claimed is: 
     
         1 . A method of protecting metal from corrosion comprising:
 using at least one N-acylamino acid or salts thereof to protect the metal.   
     
     
         2 . The method of  claim 1 , wherein the N-acylamino acid is selected from at least one compound of formula (I) 
       
         
           
           
               
               
           
         
         in which 
         R 1  signifies a linear or branched, saturated or unsaturated hydrocarbon residue, 
         R 2  denotes a hydrogen atom, a (C 1  to C 4 ) alkyl group, or a (C 2  to C 4 ) hydroxyalkyl group, 
         R 3  denotes a hydrogen atom or a 
       
       
         
           
           
               
               
           
         
       
       group, where n=1 or 2,
 M signifies, mutually independently, a hydrogen atom or an equivalent of a monovalent or polyvalent cation. 
 
     
     
         3 . A product comprises:
 a product encompassing a container that at least in portions surrounds a cavity, wherein the container comprises at least one metallic part and wherein a composition that encompasses at least one N-acylamino acid and water is arranged in the cavity.   
     
     
         4 . The product of  claim 3 , wherein the composition contains the N-acylamino acid preferably in a quantity from 0.0001 to 5.0 wt %, particularly preferably from 0.005 to 2.0 wt %, very particularly preferably from 0.005 to 1.0 wt %, based in each case on the weight of the composition. 
     
     
         5 . The product of  claim 3 , wherein the composition is liquid at a temperature from 10 to 40° C. at 1013 mbar. 
     
     
         6 . The product of  claim 3 , wherein the composition additionally contains at least one cationic surfactant. 
     
     
         7 . The product of  claim 3 , wherein the composition additionally contains at least one cationic polymer. 
     
     
         8 . The product of  claim 3 , wherein the container is an aerosol container, and the composition additionally contains at least one propellant. 
     
     
         9 . The product of  claim 3 , wherein metallic parts of the container have been coated with a paint. 
     
     
         10 . The product of  claim 9 , wherein the paint is a powder paint.