Removing thin oxide layer from a surface of a metal object, comprises exposing the metal surface to an oxide-reducing environment, reducing the oxide layer, so that the metal surface is blank, and subjecting the metal object to a cooling

摘要

The method comprises exposing a metal surface to an oxide-reducing environment, reducing a thin oxide layer, so that the metal surface is blank, and subjecting the metal object to a cooling under avoidance of and/or protection from contact with oxygen until the temperature of the metal object drops under a reaction temperature with oxygen and/or air. A hot plasma- or other reducing gas stream with a temperature of 300[deg] C is used for the oxide-reducing environment. A reducing flame or a reducing flame stream is used for the plasma stream. A maximum thickness of the oxide layer is 50mu m. The method comprises exposing a metal surface to an oxide-reducing environment, reducing a thin oxide layer, so that the metal surface is blank, and subjecting the metal object to a cooling under avoidance of and/or protection from contact with oxygen until the temperature of the metal object drops under a reaction temperature with oxygen and/or air. A hot plasma- or other reducing gas stream with a temperature of 300[deg] C is used for the oxide-reducing environment. A reducing flame or a reducing flame stream is used for the plasma stream. A maximum thickness of the oxide layer is 50mu m. A fluid stream is used in connection to the reducing plasma- or gas stream for cooling and/or preventing a new oxidation. An inert gas e.g. argon or nitrogen and/or nitrogen, water or combination of water and inert gas is used for the fluid stream, which is used in the temperature of maximum 100[deg] C. The process is carried out by applying only to a limited part or section of the metal object. A tip or end area of electrically conducting copper wires, which are free from insulation, is used as the part or section of the metal object. A flow rate of the plasma- or gas stream is 0.5 meter per second. Independent claims are included for: (1) a method for stripping enameled wires; and (2) an arrangement for stripping enameled wires.