Bagherzadeh Mojtaba, Karimi Meysam, Choopan Dastjerdi Mohammad Hosein, Asadi Asadabad Mohsen, Mokhtari Javad, Babanejhad Afshin
Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.
Sci Rep. 2023 Oct 9;13(1):17007. doi: 10.1038/s41598-023-44287-0.
This study conducted an evaluation of the corrosion behavior of an aluminum alloy utilized in the Isfahan Miniature Neutron Source Reactor (MNSR). The component analyzed, dry channel (DC), had been exposed to radiation for 12 years in a water environment within the reactor pool since its installation. To determine the effect of radiation on the corrosion of the LT-21 aluminum alloy used in the DC, different parts of the pipe were sampled and various tests were performed. These tests included mechanical strengths (impact, and micro-hardening), XRD, TEM, SEM-EDS, and potentiodynamic polarization (PDP). The parameters measured included corrosion potential, corrosion rate, changes in microscopic structure, and mechanical properties of the aluminum alloy along the entire length of the DC. The neutron and gamma dose distribution along the height of the DC, which was 540 cm, was calculated to determine the correlation between the dose distribution and observed corrosion. The study found that the corrosion mechanisms were complex and resulted from the simultaneous presence of the DC in the pool water and radiation from the reactor core. The observed results are presented and discussed in this study.
本研究对伊斯法罕微型中子源反应堆（MNSR）中使用的铝合金的腐蚀行为进行了评估。所分析的部件——干通道（DC）自安装以来已在反应堆水池的水环境中暴露于辐射下12年。为了确定辐射对DC中使用的LT-21铝合金腐蚀的影响，对管道的不同部位进行了取样，并进行了各种测试。这些测试包括机械强度（冲击和微硬化）、XRD、TEM、SEM-EDS和动电位极化（PDP）。测量的参数包括腐蚀电位、腐蚀速率、微观结构变化以及沿DC全长的铝合金机械性能。计算了沿540厘米高的DC高度的中子和伽马剂量分布，以确定剂量分布与观察到的腐蚀之间的相关性。研究发现，腐蚀机制很复杂，是由DC在池水中的存在与反应堆堆芯的辐射同时作用导致的。本研究展示并讨论了观察结果。
