[en] .The corrosion effect of liquid cesium containing less than 0.01, 0.1 and more than 0.1% oxygen on Ag, Cu, Be, Al, Ti, Zr, Nb, Cr, Mg, W, Fe, V and Ni at 50-800 deg C has been investigated. Below 300 deg C no interaction between Cs containing less than 0.01% oxygen and Cu, Ti, Zr, V, Mo, W and Fe has been observed. At 300 deg C Zr and V display temper colours, and occasional pittings appear on Cu surface. At 50, 200 and 300 deg C respectively Be, Al and Nb form new phases. Silver dissolves starting from 50 deg C, nickel and chromium crack. At higher oxygen content (0.1%) oxide films appear on Ag, Be, Ti, Zr, Nb and Cr. Nb and V show intercrystallite corrosion. The tendency for cracking increases for all the metals. Cracks have been found on Ni, Cr, W, Al and Ti, while Cu at 800 deg manifests complete brittle failure