USE OF SEPARATION GAS IN CONTINUOUS HOT DIP METAL FINISHING

• Main Authors: BRISBERGER ROLF, TRAKOWSKI WALTER
• Format: Patent
• Language: English; Polish
• Published: 30.07.2010
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention relates to a method for suppressing zinc evaporation in the hot dip metal coating of a steel strip with zinc or zinc alloys. According to the invention, a separation gas layer is provided above the metal bath, said gas being selected from argon, butane, krypton, propane, sulphur dioxide, hydrogen sulphide, xenon, acetylene, arsine, boron trichloride, boron trifluoride, butene, dichlorosilane, disilane, ethylene oxide, tetrafluoromethane, monochlorodifluoromethane, trifluoromethane, hexafluoroethane, tetrafluoroethene, isobutane, nitrogen dioxide, nitrogen(III) fluoride, nitrogen oxide, phosphine, propene, silane, silicon tetrafluoride, silicon tetrachloride, sulphur hexafluoride, sulphur tetrafluoride, tungsten hexafluoride, or from an arbitrary combination of the aforementioned gases to form a gas mixture with or without argon. Said gases have a poor conductivity and are suitable for preventing gaseous turbulence.