Experimental Evaluation on Aluminum Pitting Corrosion Rate at Pool Bottom of the 49-2 Swiming Pool Reactor
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摘要: 49-2游泳池式反应堆池底和池壁材料为纯铝，为掌握池底点缺陷的实际状态和变化情况，确保反应堆的安全稳定运行，本工作根据池底结构、池内介质、池壁材料等信息，模拟池底点缺陷腐蚀环境，开展了极端工况下池底铝材腐蚀速率测量实验研究。本实验给出了点缺陷处铝材最大腐蚀速率为0.0326 mm/a，为反应堆池底的完整性评估提供了技术数据。
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关键词:
- 49-2游泳池式反应堆 /
- 铝材 /
- 点缺陷 /
- 腐蚀速率
Abstract: The pool bottom and wall of the 49-2 swimming pool reactor are made of pure aluminum. In order to grasp the actual state and changes of the defects at the pool bottom and ensure the safe and stable operation of the reactor, based on the information of the pool bottom, the medium in the pool, the material of the pool wall, etc., the pitting corrosion environment of the point defects at the pool bottom was simulated, and the experimental research on the measurement of aluminum corrosion rate at the pool bottom under extreme working conditions was carried out. The maximum corrosion rate of the aluminum at the point defects is 0.0326 mm/a, which provides technical data for the integrity assessment of the bottom of the reactor.-
Key words:
- 49-2 swimming pool reactor /
- Aluminum /
- Point defects /
- Corrosion rate
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图 3 2.0 mm孔的底部氯离子浓度分布
S—孔底某一位置与孔中心的距离，下同。
Figure 3. Chloride Ion Concentration Distribution at the Bottom of a 2.0 mm Hole
图 4 5.0 mm 孔的底部氯离子浓度分布
Figure 4. Chloride Ion Concentration Distribution at the Bottom of a 5.0 mm Hole
图 5 机械钻孔法预制点缺陷试样实物图
Figure 5. Physical Diagramg of the Defective Specimen of the Prefabricated Point by the Mechanical Drilling Method
图 6 2.0 mm孔径试样激光共聚焦显微镜测试结果
Figure 6. Laser Confocal Microscopy Test Results of 2.0mm Aperture Specimens
图 8 在C0工况下浸泡62 d后的试样照片
Figure 8. Photograph of the Specimen after 62 Days of Immersion at C0 Condition
图 9 2.0 mm孔径试样在C0工况条件下浸泡62 d后的SEM图
Figure 9. Scanning Electron Microscope Image of a 2.0mm Aperture Specimen after 62 Days of Immersion at C0 Condition
图 10 试样点缺陷内和点缺陷外EDS 分析部位
Figure 10. EDS Analysis Site of the Specimen inside and outside the Point Defect
图 11 2.0 mm孔径试样在C0工况下浸泡62 d后的激光共聚焦显微镜测试结果
Figure 11. Laser Confocal Microscopy Test Results of 2.0mm Aperture Specimens after 62 Days of Immersion in C0 Condition
图 12 纯铝材料在C0 条件下腐蚀速率与浸泡时间的关系拟合曲线
Figure 12. Fitting Curve of Corrosion Rate and Immersion Time of Pure Aluminum Material in C0 Condition
表 1 实验用铝材元素成分
Table 1. Elemental Composition of Aluminum for Experiments
元素 Al Si S 质量分数/% 99.85 0.14 0.01 
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表 2 试样点缺陷内、外腐蚀产物EDS分析结果
Table 2. EDS Analysis Results of Corrosion Products of Specimen inside and outside the Point Defect
元素 点缺陷内 点缺陷外 谱图2 谱图3 谱图4 谱图9 谱图10 谱图11 C 3.82 3.50 3.03 5.54 6.01 5.24 O 61.23 61.21 62.51 60.49 60.34 60.47 Al 34.95 35.29 34.46 33.97 33.65 34.28 表中数据为质量分数，%。
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表 3 纯铝材料在C0工况下浸泡不同时间后的腐蚀速率
Table 3. Corrosion Rate of Pure Aluminium after Immersion at C0 for Different Periods of Time
试样编号 浸泡时间/d 平均腐蚀深度/µm 腐蚀速率/（mm·a−1） C0-2-7D 7 11.4 0.591 C0-2-14D 14 14.7 0.382 C0-2-21D 21 11.4 0.197 C0-2-28D 28 12.0 0.156 C0-2-35D 35 9.0 0.094 C0-2-50D 50 9.4 0.068 C0-2-62D 62 5.4 0.031
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