新型镍基耐蚀合金在模拟后处理废液中的腐蚀

Corrosion behavior of newnickle-based corrosion-resistant alloy in simulated reprocessing waste solution

采用离子溶出法、晶间腐蚀试验等方法,使用金相显微镜、电子探针等仪器研究了新型耐蚀合金在模拟后处理废液中的耐腐蚀性能。结果表明该耐蚀合金为奥氏体组织,在模拟废液中具有优良的耐腐蚀性能,经110℃连续腐蚀实验,发生了均匀腐蚀,未发现点蚀现象。在室温下年腐蚀速率为0.004 mm/a,110℃工作环境下年腐蚀速率为0.007 mm/a,其焊接试样室温下的年腐蚀速率为0.005 mm/a,110℃工作环境下年腐蚀速率为0.010 mm/a,均大幅优于现役316L。该新型耐蚀合金可应用于高寿命设计的后处理容器与设备。

The corrosion resistance of new nickle-based corrosion-resistant alloys which are used in simulated reprocessing waste solution is studied by means of ion dissolution method and intergranular corrosion test.The results show that the corrosion-resistant alloy is austenitic structure and has excellent corrosion resistance in simulated reprocessing waste solution.Uniform corrosion occurs,but no pitting corrosion is found after 110℃continuous corrosion in simulated reprocessing waste solution.The alloy's annual corrosion rate is 0.004 mm/a at room temperature,and 0.007 mm/a at 110℃in the simulated corrosion solution.The welded sample's annual corrosion rate is 0.005 mm/a at room temperature,and 0.010 mm/a at 110℃in the simulated corrosion solution.The 316L's annual corrosion rates are several times higher than this new nickle-based corrosion-resistant alloy.The new nickle-based corrosion-resistant alloy can be applied to the design of reprocessing containers and equipments with long service life.