论文部分内容阅读
通过实验室环境模拟沸水堆(BWR)和压水堆(PWR)乏燃料的贮存环境对不同表面处理试样开展全浸腐蚀实验。采用SEM和EDS观测腐蚀微观形貌和分析腐蚀产物,采用XRD测试腐蚀试样的物相,并通过测试试样干重得到腐蚀动力学曲线。结果表明,材料中的Al和微量元素Mg,Fe是引起腐蚀的主要因素;抛光处理试样在PWR贮存液中时,因Fe的影响出现4种微观腐蚀形貌,耐蚀性较差,而在BWR贮存液中时生成Al(OH)3保护膜,耐蚀性较好;阳极氧化处理试样在PWR和BWR贮存液中均腐蚀增重,腐蚀产物能封闭氧化膜孔洞,抗腐蚀性能最好。
Full immersion corrosion tests were conducted on different surface treated specimens by simulating the storage environment of spent fuel in BWR and PWR in laboratory environment. The corrosion microstructure was observed by SEM and EDS, the corrosion products were analyzed by XRD, the corrosion phase was measured by XRD and the corrosion kinetics curve was obtained by testing the dry weight of the sample. The results show that Al and trace elements Mg and Fe in the material are the main factors causing corrosion. Four kinds of microscopic corrosion morphology appear in the PWR storage solution, In the BWR storage solution, the protective film of Al (OH) 3 was formed, which showed good corrosion resistance. The corrosion resistance of the anodic oxide treated samples in both PWR and BWR storage solutions was very high. it is good.