Method for pickling metallic surfaces by using alkoxylated alkynols

Abstract

Process for pickling metallic surfaces by treating the metallic surface with a composition which comprises water, at least one acid, an alkyne alkoxylate and optionally further additives. In a preferred embodiment, the alkyne alkoxylate is used together with a complexing agent.

1 . A process for pickling metallic surfaces comprising treating the metallic surface with an acidic aqueous formulation which comprises at least one acid, a pickling inhibitor and optionally further additives, wherein the aqueous formulation comprises at least the following components: 
 (a) from 60 to 99.97% by weight of a mixture of water and at least one acid,    (b) from 0.01 to 2% by weight of at least one alkyne propoxylate of the formula     HC≡C—CH 2 —O(—CH 2 —CH(CH 3 )—O—) n H  (I)   or     H(—O—CH(CH 3 )—CH 2 —) n —O—CH 2 —C≡C—CH 2 —O(—CH 2 —CH(CH 3 )—O—) n′ H,  (II)   where the indices n and n′ independently of one another are from 1 to 10, and    (c) from 0.01 to 20% by weight of at least one surface-active substance.    
     
     
         2 . The process according to  claim 1 , wherein the indices n and n′, independently of one another, are from 1 to 3.  
     
     
         3 . (canceled)  
     
     
         4 . (canceled)  
     
     
         5 . (canceled)  
     
     
         6 . (canceled)  
     
     
         7 . (canceled)  
     
     
         8 . The process according to  claim 1 , wherein the pH of the composition is from 3 to 6.  
     
     
         9 . The process according to  claim 1 , wherein the acid is at least one acid selected from the group consisting of hydrochloric acid, sulfuric acid, methanesulfonic acid and phosphoric acid.  
     
     
         10 . The process according to  claim 1 , wherein the metallic surface is at least one surface selected from the group of consisting of iron, steel, zinc, brass and aluminum.  
     
     
         11 . The process according to  claim 1 , wherein the surface is the surface of a strip metal.  
     
     
         12 . A process for pickling metallic surfaces comprising treating the metallic surface with an acidic aqueous formulation which comprises at least one acid, a pickling inhibitor and optionally further additives, wherein the aqueous formulation comprises at least the following components: 
 (d) from 60 to 99.97% by weight of a mixture of water and at least one acid,    (e) from 0.01 to 2% by weight of at least one alkyne alkoxylate of the formula     HC≡C—CH 2 —O(—CH 2 —CHR 1 —O—) n H  (I)   or     H(—O—CHR 1 —CH 2 —) n —O—CH 2 —C≡C—CH 2 —O(—CH 2 —CHR 1 —O—) n H,  (II)   where the radicals R 1  in each case independently of one another are H or methyl and the indices n and n′, independently of one another, are from 1 to 10,    (f) from 0.01 to 20% by weight of at least one surface-active substance, and    (g) from 0.01 to 10% by weight of at least one water-soluble, at least bidentate, chelate-forming complexing agent comprising acidic groups and/or at least one water-soluble polymer comprising quatemized ammonium groups.    
     
     
         13 . An acidic, aqueous composition for pickling metallic surfaces, which comprises at least one acid, a pickling inhibitor and optionally further additives, wherein the aqueous formulation comprises at least the following components: 
 (a) from 60 to 99.97% by weight of a mixture of water and at least one acid,    (b) from 0.01 to 2% by weight of at least one alkyne alkoxylate of the formula     HC≡C—CH 2 —O(—CH 2 —CHR 1 —O—) n H  (I)   or     H(—O—CHR 1 —CH 2 —) n —O—CH 2 —C≡C—CH 2 —O(—CH 2 —CHR 1 —O—) n H,  (II)   where the radicals R 1  in each case independently of one another are H or methyl and the indices n and n′, independently of one another, are from 1 to 10,    (c) from 0.01 to 20% by weight of at least one surface-active substance, and    (d) from 0.01 to 10% by weight of at least one water-soluble, at least bidentate, chelate-forming complexing agent comprising acidic groups and/or at least one water-soluble polymer comprising quatemized ammonium groups.    
     
     
         14 . The composition according to  claim 13 , wherein the aqueous formulation has the following composition: 
 (a) from 70 to 98.9% by weight of a mixture of water and at least one acid,    (b) from 0.1 to 2% by weight of alkyne alkoxylates,    (c) from 0.5 to 15% by weight of a surface-active substance, and    (d) from 0.5 to 10% by weight of a chelate-forming complexing agent and/or a polymer com    
     
     
         15 . A process for pickling metallic surfaces comprising treating the metallic surface with an acidic aqueous formulation which comprises at least one acid, a pickling inhibitor and optionally further additives, wherein the aqueous formulation comprises at least the following components: 
 (h) from 60 to 99.97% by weight of a mixture of water and at least one acid,    (i) from 0.01 to 2% by weight of at least one alkyne propoxylate of the formula     HC≡C—CH 2 —O(—CH 2 —CH(CH 3 )—O—) n H  (I)   or     H(—O—CH(CH 3 )—CH 2 —) n —O—CH 2 —C≡C—CH 2 —O(—CH 2 —CH(CH 3 )—O—) n′ H,  (II)   where the indices n and n′ independently of one another are from 1 to 10,    (j) from 0.01 to 10% by weight of at least one water-soluble, at least bidentate, chelate-forming complexing agent comprising acidic groups and/or at least one water-soluble polymer comprising quatemized ammonium groups.    
     
     
         16 . The process according to  claim 15 , wherein the weight ratio of complexing agent to pickly inhibitor is form 5:1 to 1:10.  
     
     
         17 . The process according to  claim 12 , wherein the weight ratio of complexing agent to pickling inhibitor is form 5:1 to 1:10.  
     
     
         18 . The process according to  claim 15 , wherein the indices n and n′, independently of one another, are from 1 to 3.  
     
     
         19 . The process according to  claim 12 , wherein the indices n and n′, independently of one another, are from 1 to 3.  
     
     
         20 . The process according to  claim 15 , wherein the PH of the composition is from 3 to 6.