Abstract
The container of high-level radioactive waste (HLRW) being in deep geological disposal, the backfill material is needed to serve as the second defense for HLRW and the highly compacted bentonite is generally selected. As the time goes, the underground water will infiltrate the backfill, causing the corrosion of materials for the building of containers in the formed electrolyte. Carbon steel, titanium and its alloy are the potential candidate materials for the fabrication of HLRW containers. The current investigation aims at assessing the safety of HLRW container in deep geological disposal for hundreds of thousands of years and facilitating the material selection for future container fabrication by estimating their corrosion behavior in compacted bentonite with a series of moisture content at different temperatures through electrochemical methods including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve (PC) measurements. The corrosion rates were estimated for a carbon steel, a pure titanium and a titanium alloy in compacted Gaomiaozi Bentonite infiltrated with simulated underground water in Beishan area of China over an expected disposal period up to 106 years respectively, showing that titanium and its alloy are more reliable materials for building HLRW containers than carbon steel.
Highlights
Nuclear techniques are widely used by many countries in a lot of fields including energy, medical science, manufacture, agriculture and so on[1]
Corrosion effect of high-level radioactive waste (HLRW) container is one of the most important problems needing to be solved in the HLRW disposal
The work of this paper focuses on assessment of safety about HLRW container by the estimation of the corrosion behavior of carbon steel, titanium and its alloy in compacted bentonite infiltrated with simulated underground water of Beishan area of China in a geological time scale to facilitate the optimal selection of container materials and design
Summary
Nuclear techniques are widely used by many countries in a lot of fields including energy, medical science, manufacture, agriculture and so on[1]. It is necessary to study the corrosion behavior of the container in bentonite under deep geological disposal conditions and to estimate the corrosion rates in geological time scale. The work of this paper focuses on assessment of safety about HLRW container by the estimation of the corrosion behavior of carbon steel, titanium and its alloy in compacted bentonite infiltrated with simulated underground water of Beishan area of China in a geological time scale to facilitate the optimal selection of container materials and design. Because human body contains chloride ions, the electrochemical method in our research can be used to study the corrosion behavior of titanium and its alloy implanted in human body and to predict the corrosion life
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