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首页> 外文会议>Advances in materials science for environmental and nuclear technology II >PERFORMANCE OF A CARBON STEEL CONTAINER IN A CANADIAN USED NUCLEAR FUEL DEEP GEOLOGICAL REPOSITORY
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PERFORMANCE OF A CARBON STEEL CONTAINER IN A CANADIAN USED NUCLEAR FUEL DEEP GEOLOGICAL REPOSITORY

机译：加拿大使用的核燃料深层地质处置库中碳钢容器的性能

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Experimental work was undertaken to evaluate the long-term corrosion behaviour of a carbon steel used fuel container in postulated Canadian deep geological repository environments. Specifically, atmospheric corrosion testing was conducted in anoxic atmospheres at 30, 50 and 70°C, over a wide range of relative humidity (30-100% RH). Hydrogen evolved from steel corrosion was initially monitored with a high sensitivity pressure gauge system (the sensitivity of such measurements is ca. 0.005 μm y~(-1)) and later using a solid-state electrochemical hydrogen sensor (the hydrogen sensor can detect the pressure increase down to a limit of ca. 0.1 Pa corresponding to a corrosion rate as low as ca. 0.0001 μm y~(-1)). Results observed in this study indicate that it is highly likely that the corrosion rate will fall below 1 nm y~(-1) within a year once an anoxic condition is attained. In parallel with the corrosion experiments, corrosion product surface analyses were performed using (i) scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM/EDX) to determine the morphology of the corrosion product films, (ii) X-ray photoelectron spectroscopy (XPS) to identify the chemical composition of the films, and (iii) Raman and Fourier Transform Infrared spectroscopy (FTIR) to study bonding. Oxides formed on steel surfaces were found to consist mostly of Fe_3O_4, with some Fe(III) species from traces of air exposure; carbonate was detected on the Nad contaminated surfaces which had been subject to a degree of prior aerobic corrosion. A high humidity (100%) environment produces more loose surface oxide than a lower humidity environment (75%). The experimental results support the use of carbon steel as a potential used fuel container material in a Canadian deep geological repository located in sedimentary rock.
机译：进行了实验工作，以评估假定的加拿大深层地质处置库环境中碳钢废燃料容器的长期腐蚀行为。具体地，在30、50和70℃的缺氧气氛中，在较宽的相对湿度（30-100％RH）范围内进行大气腐蚀测试。最初使用高灵敏度压力计系统监控从钢腐蚀产生的氢气（此类测量的灵敏度约为0.005μmy〜（-1）），随后使用固态电化学氢气传感器（氢气传感器可以检测出压力增加到大约0.1 Pa的极限，对应于低至大约0.0001μmy〜（-1）的腐蚀速率。在这项研究中观察到的结果表明，一旦达到缺氧条件，腐蚀速率很可能在一年内降至1 nm y〜（-1）以下。与腐蚀实验同时，使用（i）扫描电子显微镜和能量色散X射线分析（SEM / EDX）进行腐蚀产物表面分析，以确定腐蚀产物膜的形态，（ii）X射线光电子光谱仪（XPS）来确定薄膜的化学成分，以及（iii）拉曼和傅里叶变换红外光谱仪（FTIR）来研究粘合。发现在钢表面上形成的氧化物主要由Fe_3O_4组成，其中一些Fe（III）种类来自暴露于空气中的痕迹。在已受到一定程度的需氧腐蚀的Nad污染表面上检测到碳酸盐。高湿度（100％）的环境比低湿度环境（75％）会产生更多的疏松表面氧化物。实验结果支持将碳钢用作位于沉积岩中的加拿大深层地质库中潜在的燃料容器材料。

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