Patent ID: 9512539
Filing Date: 2016-12-06
CPC Classification: B23H,C25F

Claim Text:
1. A process for removing a coating from workpieces having a conductive substrate and the coating comprising an electrically non-conducting surface, wherein the process is carried out by means of an electrolyte and includes the following steps: preparing a tank, wherein inside the tank an electrode that can be connected to one pole of a power supply device is provided filling an electrolyte into the tank, so that the electrode comes into contact with the electrolyte immersing one or several workpieces into the electrolyte, the one or several workpieces having the coating that comprises the electrically non-conductive surface, the coating comprising at least one of CrN, DLC, CrC and AlCrN applying a voltage between the workpiece and the electrode for at least partial removal of the coating characterized in that: the voltage during the at least partial coating removal is applied for a first time interval EI the voltage is increased to a second applied voltage U wherein the increased voltage U