Electrolyte for the galvanic deposition of aluminum-magnesium alloys

Abstract

The invention relates to an electrolyte for the galvanic deposition of aluminum-magnesium alloys, which includes at least one aluminum-organic complex compound of the formula MAIR4 or mixtures thereof and a magnesium alkyl compound, wherein M represents Na, K, Rb or Cs and R represents a C1 to C10 alkyl group, preferably a C1 to C4 alky group. The invention also relates to a method for producing an electrolyte, to a coating method, the use of the electrolyte and to an electrolysis kit.

1 . An electrolyte for the galvanic deposition of aluminum-magnesium alloys, containing at least one organoaluminum complex compound of formula MAlR 4  or mixtures thereof and an alkylmagnesium compound, wherein M represents Na, K, Rb or Cs, and R represents a C 1 -C 10  alkyl group, preferably a C 1 -C 4  alkyl group.  
     
     
         2 . The electrolyte according to  claim 1 , characterized in that the electrolyte additionally includes trialkylaluminum.  
     
     
         3 . The electrolyte according to  claim 1  or  2 , characterized in that the electrolyte includes AlR 3 , M 1 AlR 4 , M 2 AlR 4  and Mg(R 1 ) x (R 2 ) y , wherein M 1  and M 2  are different from each other, representing Na, K, Rb or Cs, R represents a C 1 -C 10  alkyl group, preferably a C 1 -C 4  alkyl group, R 1  and R 2  independently represent a C 1 -C 20 , preferably a C 2 -C 10  alkyl group, and x=0 to 2, and y=0 to 2, and x+y=2.  
     
     
         4 . The electrolyte according to one or more of  claims 1  to  3 , characterized in that the alkylmagnesium compound is included in an amount of from 0.01 to 10 mole-%, preferably from 0.1 to 1 mole-%, relative to the aluminum complex.  
     
     
         5 . The electrolyte according to one or more of  claims 1  to  4 , characterized in that the alkylmagnesium compound is selected from the group of Mgbutyl 1.5 octyl 0.5 , Mgbutyl 1.0 ethyl 1.0 , Mgsec-butyl 1.0 n-butyl 1.0  or mixtures thereof.  
     
     
         6 . The electrolyte according to one or more of  claims 1  to  5 , characterized in that the electrolyte includes an organic solvent.  
     
     
         7 . The electrolyte according to  claim 6 , characterized in that the organic solvent is an aromatic solvent.  
     
     
         8 . The electrolyte according to  claim 7 , characterized in that the aromatic solvent is benzene, toluene or xylene or a mixture thereof.  
     
     
         9 . A method for the production of the electrolyte according to  claims 1  to  8 , characterized by the following steps: 
 supplying an organoaluminum complex compound of formula MAlR 4  or a mixture thereof, optionally in combination with trialkylaluminum,    addition of an alkylmagnesium compound,    wherein M represents Na, K, Rb or Cs, and R represents a C 1 -C 10  alkyl group, preferably a C 1 -C 4  alkyl group.    
     
     
         10 . The method according to  claim 9 , characterized in that the organoaluminum complex compound is a mixture of M 1 AlR 4  and M 2 AlR 4 , wherein M 1  and M 2  are different from each other, representing Na, K, Rb or Cs, R represents a C 1 -C 10  alkyl group, preferably a C 1 -C 4  alkyl group.  
     
     
         11 . The method according to  claim 9 , characterized in that the alkylmagnesium compound is Mg(R 1 ) x (R 2 ) y , wherein R 1  and R 2  independently represent a C 1 -C 20 , preferably a C 2 -C 10  alkyl group, and x=0 to 2, and y=0 to 2, and x+y=2.  
     
     
         12 . The method according to one or more of  claims 9  to  11 , characterized in that the alkylmagnesium compound is added dissolved in a hydrocarbon.  
     
     
         13 . The method according to one or more of  claims 9  to  11 , characterized in that the alkylaluminum complex is supplied dissolved in an aromatic hydrocarbon.  
     
     
         14 . The method according to  claim 12 , characterized in that the hydrocarbon is a saturated or unsaturated hydrocarbon.  
     
     
         15 . The method according to  claim 14 , characterized in that the hydrocarbon is selected from the group of i-pentane, n-pentane, hexane, n-hexane, heptane, n-heptane, toluene, xylene.  
     
     
         16 . An electrolyte for the production of aluminum-magnesium alloys on electrically conducting materials or electrically conducting layers, which can be produced according to the method of  claims 9  to  15 .  
     
     
         17 . A method of coating electrically conducting materials or layers with aluminum-magnesium alloys using the electrolyte in accordance with  claims 1  to  8 , in which method the alkylmagnesium compound is metered during coating.  
     
     
         18 . Use of the electrolyte according to  claims 1  to  8  and  16  for the production of layers of aluminum-magnesium alloys on electrically conducting materials or layers.  
     
     
         19 . An electrolysis kit for the galvanic deposition of aluminum-magnesium alloys on electrically conducting materials or layers, including: 
 (a) the organoaluminum complex compounds or alkylaluminum compounds of  claims 1  to  3 ; and    (b) an alkylmagnesium compound in accordance with claims  1 ,  3 ,  5 .    
     
     
         20 . The electrolysis kit according to  claim 19 , characterized in that the compounds (a) and (b) are present in an organic solvent.  
     
     
         21 .- 26 . (canceled)