Workpieces Coated with an Aluminum/Magnesium Alloy

Abstract

The invention relates to a coated workpiece comprising a substrate, a metallic layer applied to said substrate, and a layer containing a aluminum/magnesium alloy applied to the intermediate layer. The invention also relates to a method for producing this coated workpiece.

1 . A coated workpiece comprising a substrate, an intermediate metallic layer coated on said substrate, and a layer coated on said intermediate layer, which includes an aluminum/magnesium alloy.  
     
     
         2 . The coated workpiece according to  claim 1 , wherein the surface of the substrate is electrically conductive.  
     
     
         3 . The coated workpiece according to  claim 1 , wherein the substrate contains a metal and/or a metal alloy and/or is a metallized substrate.  
     
     
         4 . The coated workpiece according to  claim 1 , wherein the substrate contains constituents selected from iron, steel, iron alloy, nonferrous metals, pressure-cast zinc, pressure-cast aluminum, titanium, titanium in the form of an alloy, magnesium, pressure-cast magnesium, or mixtures thereof.  
     
     
         5 . The coated workpiece according to  claim 1 , wherein the intermediate layer contains iron, iron and nickel, tin and nickel, nickel, cobalt, copper, chromium, molybdenum, vanadium or alloys of said metals.  
     
     
         6 . The coated workpiece according to  claim 1 , wherein the intermediate layer has a layer thickness of from 0.1 μm to 30 μm.  
     
     
         7 . The coated workpiece according to  claim 1 , wherein the layer coated on the intermediate layer, which contains an aluminum/magnesium alloy, contains from 0.5 to 70 wt.-% magnesium.  
     
     
         8 . The coated workpiece according to  claim 1 , wherein the layer coated on the intermediate layer, which contains an aluminum/magnesium alloy, has a layer thickness of from 0.1 μm to 100 μm.  
     
     
         9 . The coated workpiece according to  claim 1 , wherein the coated workpieces are rack goods, bulk materials, or continuous products.  
     
     
         10 . A method for the production of a coated workpiece, comprising the steps of: 
 a) coating an intermediate metallic layer on a substrate, and    b) coating a layer containing an aluminum/magnesium alloy on said intermediate metallic layer.    
     
     
         11 . The method for the production of a coated workpiece according to  claim 10 , wherein the intermediate metallic layer is deposited from an aqueous solution or from a non-aqueous solution in step a).  
     
     
         12 . The method for the production of a coated workpiece according to  claim 10  or  11 , wherein the intermediate metallic layer is electrodeposited from an aqueous electrolyte in step a).  
     
     
         13 . The method for the production of a coated workpiece according to  claim 10 , wherein the layer including an aluminum/magnesium alloy is deposited from an anhydrous electrolyte in step b).  
     
     
         14 . The method for the production of a coated workpiece according to  claim 13 , wherein the layer including an aluminum/magnesium alloy is electrodeposited from said anhydrous electrolyte in step b).  
     
     
         15 . The method for the production of a coated workpiece according to  claim 10 , wherein an electrically conductive layer is coated on the substrate prior to coating the intermediate metallic layer in step a).  
     
     
         16 . The method for the production of a coated workpiece according to  claim 15 , wherein the electrically conductive layer is coated on the substrate by means of metallization.  
     
     
         17 . The coated workpiece according to  claim 4 , wherein the substrate contains constituents selected from alloys of iron, steel, iron alloy, nonferrous metals, pressure-cast zinc, pressure-cast aluminum, titanium, magnesium, pressure-cast magnesium, or mixtures thereof.  
     
     
         18 . The coated workpiece according to  claim 9 , wherein the coated workpieces are selected from a wire, a metal sheet, a screw, a nut, a concrete anchorage, or a machine component part.