Study of Steel Tests of Static Corrosion Experiments in Liquid Metal Pb-bi

We try to evaluate the possibility of maintaining the corrosion-resistance of a structural material under the operational temperature and flow velocity of the optimized HYPER (HYbrid Power Extraction Reactor)[1] cooling system. It was attempted to consider the control of the oxygen concentration in the range of 350~650°C. Currently, we are performing static corrosion tests with the oxygen contents of a reduced and 10~ 10 wt% atmospheres at the temperature of 600°C. The concentration was controlled by adjusting the H2 and H2O vapor ratio. In this paper, we will show the result of the experiment performed under the reduced atmosphere with an exposure time up to 1500 hours. The corrosion of 316L is irregularly severe under the reduced atmosphere due to the solubility of the nickel at Pb and Pb-Bi. Also small amount of iron and chromium was dissolved near the surface. On the other hand, the T91 and HT9 maintained the corrosion-resistance under the same condition.