MANUFACTURE OF TINPLATE AND TINPLATE CONTAINERS

摘要

Tinplate container with externally welded seam is formed of electrolytic unreflowed tinplate with external tin coating of low coating mass (less than 2 g/m2); the solderability of such tinplate being comparable with conventional reflowed tinplate of much higher coating mass. The unreflowed tinplate of low coating mass may be produced by the Halogen electrotinning process while the ratio of fluoride ions to stannous tin ions in the rinsing section is maintained at an unprecedented high level (not less than 10:1), the pH of the rinsing agent is maintained at less than 4 and the current density of the electrodeposition current is in the range 600 to 1,600 amperes per square meter of strip steel.