Behaviour of Ion-Modified Cladding Tubes from E110 Alloy in High-Temperature Water Steam

Abstract

A series corrosion tests was carried out on 10 mm long samples of fuel tubes made of the E110opt alloy in a steam at the temperature of 800 °C for 5000 s. The samples were studied in the initial state, after ion polishing, alloying of the surface layer with Fe, Fe+Mo, Fe+Y, Cr, Mg and Al atoms by ion mixing. It is shown that the ion polishing of samples by argon ions, using the chosen regime, reduces the overweight in the high-temperature oxidation (HTO) under the 800/5000 regime from 2.090 to 1.730 mg/cm 2 , respectively. A series of works on modifying the surface by ion polishing and subsequent alloying with Fe, Fe+Mo, Fe+Y, Cr, Mg and Al atoms by ion mixing was carried out on the installation ILUR-03. It is shown that under the HTO conditions, the best results were obtained in case of alloying with Fe atoms as applied to the 800/5000 oxidation regime. At that, the overweight decreased from 2.090 to 1.900 mg/cm 2 . It is shown that the highest resistance under the HTO conditions was obtained for the FeCrNi coating: under the 800/5000 regime, the overweight decreased from 2.090 to 1.720 mg/cm 2 ; under the 800/7500 regime - from 3.250 to 2.450 mg/cm 2 ; and under the 1000/5000 regime - from 5.340 to 5.140 mg/cm 2 .