Coating of Substrates

Abstract

The invention relates to a method for producing coated workpieces, which includes (a) electrodeposition of one or more layers containing at least one metal and/or metal alloy on a substrate and (b) thermal treatment of the coated substrate at a temperature of between 300° C. and 1000° C. in such a way that at least the surface layer of the substrate and the layer or layers applied in step (a) partially and/or completely interdiffuse. The invention also relates to coated workpieces produced by this method.

1 . A method for the production of coated workpieces, comprising the steps of: 
 a) electrodepositing one or more layers containing at least one metal and/or metal alloy on a substrate, and    b) thermally treating the coated substrate at a temperature of between 300° C. and 1000° C. in such a way that at least the surface layer of the substrate and the layer or layers applied in step a) partially and/or completely interdiffuse.    
   
   
       2 . The method according to  claim 1 , wherein the substrate of step a) is electrically conductive.  
   
   
       3 . The method according to  claim 1 , wherein the substrate of step a) is a metallic substrate and/or metallized substrate.  
   
   
       4 . The method according to  claim 3 , wherein the metallic substrate and/or metallized substrate includes one or more metals, said metals preferably being transition metals.  
   
   
       5 . The method according to  claim 3 , wherein the substrate is selected from the group of substrates consisting of the metals magnesium, zinc, tin, titanium, iron, nickel, chromium, vanadium, tungsten, molybdenum, manganese, cobalt and mixtures and/or alloys thereof.  
   
   
       6 . The method according to  claim 1 , wherein the layer of step a) is coated from a non-aqueous electrolyte or from an aqueous electrolyte.  
   
   
       7 . The method according to  claim 6 , wherein the layer of step a) is selected from aluminum, magnesium, tin, nickel and mixtures and/or alloys thereof.  
   
   
       8 . The method according to  claim 6 , wherein the metal alloy includes an aluminum/magnesium alloy and/or an aluminum/tin alloy.  
   
   
       9 . The method according to  claim 1 , wherein the temperature and/or duration of the thermal treatment of step b) is selected in such a way that an alloy containing metal of the surface layer of the substrate and metal and/or metal alloy of the coated layer will be formed at least in the boundary area between substrate and coated layer of step a).  
   
   
       10 . The method according to  claim 1 , wherein the temperature of thermal treatment of step b) is between 400° C. and 1000° C.  
   
   
       11 . The method according to  claim 1 , wherein the duration of thermal treatment in step b) is between 1 second and 10 hours.  
   
   
       12 . The method according to  claim 1 , wherein subsequent to coating the layer in step a) and prior to performing the thermal treatment in step b), the layer is subjected to further treatment.  
   
   
       13 . The method according to  claim 12 , wherein said treatment is anodic oxidation.  
   
   
       14 . The method according to  claim 1 , wherein the coated workpieces are rack goods, bulk materials, continuous products or molded articles.  
   
   
       15 . A coated workpiece, which can be obtained according to  claim 1 .  
   
   
       16 . The coated workpiece according to  claim 15 , wherein said coated workpieces are rack goods, bulk materials, continuous products or molded articles.  
   
   
       17 . The method of  claim 10 , wherein the temperature of thermal treatment of step b) is between 450° C. and 900° C.  
   
   
       18 . The method of  claim 10 , wherein the temperature of thermal treatment of step b) is between 500° C. and 800° C.  
   
   
       19 . The method of  claim 11 , wherein the duration of thermal treatment in step b) is between 1 minute and 5 hours.  
   
   
       20 . The method of  claim 11 , wherein the duration of thermal treatment in step b) is between 2 minutes and 3 hours.  
   
   
       21 . The method according to  claim 13 , wherein said anodic oxidation is anodization of the layer.  
   
   
       22 . The method of  claim 14 , wherein said coated workpieces are selected from the group consisting of a wire, a metal sheet, a screw, a nut, a concrete anchorage, a machine component part, an engine, an engine part, and a turbine blade.