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A structural component for a device for the treatment of melts, especially of glass melts, having a base body of metal or of a metal alloy and a cooling system in which a cooling medium is led through the structural component for the leading-off of heat. The base body is provided with a coating of a

A structural component for a device for the treatment of melts, especially of glass melts, having a base body of metal or of a metal alloy and a cooling system in which a cooling medium is led through the structural component for the leading-off of heat. The base body is provided with a coating of a material the decomposition temperature of which lies below the temperature of the melt, and the cooling system is designed and arranged in such manner that the temperature of the boundary layer of the melt that immediately surrounds the structural component lies below the decomposition temperature of the coating material.

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The invention claimed is: 1. A structural component for a device for the treatment of glass melts, comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provi

The invention claimed is: 1. A structural component for a device for the treatment of glass melts, comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of a glass melt that directly surrounds the structural component in use lies below the melt temperature of the coating of plastic material; wherein the plastic material is halogen-containing. 2. Structural component according to claim 1, wherein the coating thickness is less than 1 mm. 3. Structural component according to claim 1, wherein the base body consists essentially of copper, platinum, steel or aluminum, or of alloys of these metals. 4. Structural component according to claim 1, wherein the structural component it is an agitator for the homogenization of glass melts. 5. A structural component for a device for the treatment of glass melts, comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of a glass melt that directly surrounds the structural component in use lies below the melt temperature of the coating of plastic material; wherein the coating thickness is less than 1 mm. 6. Structural component according to claim 5, characterized in that the coating thickness lies between 20 μ and 250μ. 7. Structural component according to claim 6, wherein the base body consists essentially of copper, platinum, steel or aluminum, or of alloys of these metals. 8. Structural component according to claim 6, wherein the structural component is an agitator for the homogenization of glass melts. 9. Structural component according to claim 5, wherein the base body consists essentially of copper, platinum, steel or aluminum, or of alloys of these metals. 10. Structural component according to claim 5, wherein the structural component is an agitator for the homogenization of glass melts. 11. A structural component for a device for the treatment of glass melts, comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of a glass melt that directly surrounds the structural component in use lies below the melt temperature of the coating of plastic material; wherein the base body consists essentially of copper, platinum, steel, or of alloys of these metals. 12. A structural component for a device for the treatment of glass melts, comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of a glass melt that directly surrounds the structural component in use lies below the melt temperature of the coating of plastic material; wherein the structural component is an agitator for the homogenization of glass melts. 13. A structural component for a device for the treatment of glass melts, comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of a glass melt that directly surrounds the structural component in use lies below the melt temperature of the coating of plastic material; wherein the structural component is a duct for the introduction of gases into the glass melt. 14. A structural component for a device for the treatment of glass melts, comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of a glass melt that directly surrounds the structural component in use lies below the melt temperature of the coating of plastic material; wherein the structural component is an electrode holder. 15. A structural component for a device for the treatment of glass melts, said structural component being disposed in a glass melt or in a gas space directly above a glass melt, said structural component comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of the glass melt that directly surrounds the structural component lies below the melt temperature of the coating of plastic material. 16. A structural component for a device for the treatment of glass melts, said structural component being disposed in a glass melt or in a gas space directly above a glass melt, said structural component comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of the glass melt that directly surrounds the structural component lies below the melt temperature of the coating of plastic material; wherein the plastic material is halogen-containing. 17. Structural component according to claim 16, wherein the coating thickness is less than 1 mm. 18. Structural component according to claim 16, wherein the base body consists essentially of copper, platinum, steel or aluminum, or of alloys of these metals. 19. Structural component according to claim 16, wherein the structural component it is an agitator for the homogenization of the glass melt. 20. A structural component for a device for the treatment of glass melts, said structural component being disposed in a glass melt or in a gas space directly above a glass melt, said structural component comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of the glass melt that directly surrounds the structural component lies below the melt temperature of the coating of plastic material; wherein the coating thickness is less than 1 mm. 21. Structural component according to claim 20, characterized in that the coating thickness lies between 20 μ and 250 μ. 22. Structural component according to claim 21, wherein the base body consists essentially of copper, platinum, steel or aluminum, or of alloys of these metals. 23. Structural component according to claim 21, wherein the structural component is an agitator for the homogenization of the glass melt. 24. Structural component according to claim 20, wherein the base body consists essentially of copper, platinum, steel or aluminum, or of alloys of these metals. 25. Structural component according to claim 20, wherein the structural component is an agitator for the homogenization of the glass melt. 26. A structural component for a device for the treatment of glass melts, said structural component being disposed in a glass melt or in a gas space directly above a glass melt, said structural component comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of the glass melt that directly surrounds the structural component lies below the melt temperature of the coating of plastic material; wherein the base body consists essentially of copper, platinum, steel, or of alloys of these metals. 27. A structural component for a device for the treatment of glass melts, said structural component being disposed in a glass melt or in a gas space directly above a glass melt, said structural component comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of the glass melt that directly surrounds the structural component lies below the melt temperature of the coating of plastic material; wherein the structural component is an agitator for the homogenization of glass melts. 28. A structural component for a device for the treatment of glass melts, said structural component being disposed in a glass melt or in a gas space directly above a glass melt, said structural component comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of the glass melt that directly surrounds the structural component lies below the melt temperature of the coating of plastic material; wherein the structural component is a duct for the introduction of gases into the glass melt. 29. A structural component for a device for the treatment of glass melts, said structural component being disposed in a glass melt or in a gas space directly above a glass melt, said structural component comprising: a base body of metal or a metal alloy with a cooling system in which a cooling medium is led through for the leading-off of heat through the structural component; the base body being provided with a coating of plastic material the melt temperature of which lies below the melt temperature of the glass melt; the cooling system being designed and arranged in such a manner that the temperature of the boundary layer of the glass melt that directly surrounds the structural component lies below the melt temperature of the coating of plastic material; wherein the structural component is an electrode holder.