| abstract |
Procedure for the passivation of steel surfaces of devices that are used for the production or for the processing of polycarbonates treating, at least in part in the areas that are in contact with the reagents, the metal surfaces with a polycarbonate melt that contains one or more phosphorus compounds, characterized in that passivation with the polycarbonate melt containing phosphorus compounds occurs at a temperature of 300 to 380 ° C, with a residence time of 6 to 12 hours. |