Coating method for a workpiece

Abstract

The invention relates to a coating method for a workpiece, including the following method steps: a) applying a coating liquid to the workpiece, wherein the coating liquid comprises an ionic liquid containing ions of at least one element, b) electrochemically depositing a layer of the at least one element from the coating liquid on the workpiece, c) removing the workpiece from the coating liquid, d) removing excess coating liquid from the workpiece. In order to suggest an industrially suitable coating process, particularly for workpieces having at least a partial metal surface, using stable, durable baths, it is provided that the temperature of the workpiece is set such that the temperature of the coating liquid deviates by no more than 10° C. from a predetermined set temperature during the coating process

1 - 15 . (canceled) 
     
     
         16 . A coating method for a workpiece, comprising the following method steps:
 a) applying a coating liquid on the workpiece, wherein the coating liquid comprises an ionic liquid containing ions of at least one element;   b) electrochemically depositing a layer of the at least one element from the coating liquid on the workpiece;   c) removing the workpiece from the coating liquid;   d) removing excess coating liquid from the workpiece, wherein the temperature of the workpiece is adjusted in such a way that the temperature of the coating liquid deviates by no more than 10° C. from a predetermined set temperature during the coating method.   
     
     
         17 . The method according to  claim 16 , wherein the temperature of the workpiece is adjusted in such a way that the temperature of the coating liquid deviates by no more than 5° C. from the predetermined set temperature during the coating method. 
     
     
         18 . The method according to  claim 16 , wherein the surface temperature of the workpiece is adjusted in such a way that it deviates by no more than 10° C., from the predetermined set temperature during the method steps a)-d). 
     
     
         19 . The method according to  claim 16 , wherein the workpiece is heated prior to and/or during the method steps a)-d) at least on its surface by means of hot air, infrared irradiation, by blasting the surface, by contact with a hot bath or in an inductive manner, and/or is cooled by means of cold air, by contact with a cold bath or by means of evaporation. 
     
     
         20 . The method according to  claim 18 , wherein the workpiece is heated and/or cooled
 a) exclusively prior to, or   b) exclusively during, or   c) prior to and during   at least one of method steps a)-d), so that its surface temperature deviates by no more than 10° C., from the predetermined set temperature during the method steps a)-d).   
     
     
         21 . The method according to  claim 16 , wherein a layer of a metal or an alloy, preferably comprising at least one of the elements aluminum, magnesium, zinc, nickel, chromium, tantalum, titanium, copper, silver or gold, or a layer of a semiconductor is deposited. 
     
     
         22 . The method according to  claim 16 , wherein the said method steps are carried out in an inert gas atmosphere. 
     
     
         23 . The method according to  claim 16 , wherein the coating liquid is mixed prior to and/or during at least one of method steps a)-d). 
     
     
         24 . The method according to  claim 16 , wherein the workpiece is moved during coating within an apparatus, wherein the apparatus preferably works according to the principle of a conveyer screw, a rotating drum, or a G-type drum. 
     
     
         25 . The method according to  claim 16 , wherein the coating liquid removed from the workpiece is at least partially recycled into the bath. 
     
     
         26 . The method according to  claim 16 , wherein the workpiece is cleaned and/or dried and/or electrolytically polished prior to method step a). 
     
     
         27 . The method according to  claim 16 , wherein the workpiece is rinsed after method step d), and dried after the rinse and/or rinsed residues of the coating liquid are recovered and recycled into the bath. 
     
     
         28 . The method according to  claim 16 , wherein a top coat is applied after coating. 
     
     
         29 . An apparatus for coating a workpiece by depositing a layer of at least one element from a coating liquid onto the workpiece, wherein the coating liquid comprises an ionic liquid containing ions of the at least one element, characterized by
 means for temperature measurement, by means of which a deviation of the temperature of the coating liquid and/or the temperature of the workpiece by 10° C., from a predetermined set temperature is determinable, and   means for heating and/or cooling the workpiece.   
     
     
         30 . A workpiece coated using a method according to  claim 16 .