Roughening up and activating metallic and conducting surfaces of workpieces with spark plasma has periodically igniting spark plasma formed in reactive gas

摘要

Roughening up and activating metallic and conducting surfaces of workpieces with a spark plasma has the workpiece forming an electrode of the spark discharge. A periodically igniting spark plasma is formed in a reactive gas which is passed over the spark electrode. Preferred Features: The plasma is ignited in a pressure range 2 bars, especially 0.8-1.2 bars. As a reactive gas to a flow made out of inert gas, nitrogen, carbon dioxide, water or air, a metallic-organic compound, especially a silicon-organic compound is added in a mixing ratio of 1:1000-1:10, preferably 1:100-1:10.