Untersuchungen von natriumkorrosionseffekten an austenitischen stählen mit dem raster-elektronenmikroskop

Corrosion by sodium in a closed loop with temperature gradients is characterised by solution of components of structural materials in the high-temperature zone, transport of dissolved matter along the thermal gradient and deposition in the low-temperature zone. The scanning electron microscope reveals the morphology of the corrosion effects in the hot zone and of the deposited matter in the cool zone. The use of non-dispersive X-ray analysis in conjunction with the scanning microscope can also give information about shifts in chemical composition in both zones. Even single particles 10^?4 cm in diameter can be qualitatively analysed. The possibilities of corrosion research with the scanning electron microscope are exemplified by investigation of sample which have been corroded in the hot zone, or covered partly or wholly with deposited layers in the cool zone.