SiC/SiC_(f)复合材料包壳管在高温高压水中的腐蚀行为  

Corrosion Behavior of SiC/SiC_(f) Composite Cladding Tube in High Temperature and High Pressure Water

作　　者：汪峰 肖嘉 WANG Feng;XIAO Jia(Division of Nuclear Energy and Technology,State Power Investment Corporation Research Institute,Beijing 102209,China)

机构地区：[1]国家电投集团科学技术研究院核能与核技术研究所,北京102209

出　　处：《腐蚀与防护》2024年第5期26-31,共6页Corrosion & Protection

摘　　要：采用循环高温高压水腐蚀系统模拟压水堆一回路水化学工况对SiC/SiC_(f)复合材料包壳管进行腐蚀试验。通过腐蚀后质量损失和微观形貌分析了SiC/SiC_(f)复合材料包壳管的腐蚀行为。结果表明:腐蚀过程中SiC/SiC_(f)复合材料包壳管依次经历了质量增加、质量加速损失、质量稳定损失和质量损失趋缓等阶段;在腐蚀初期的质量增加阶段,富硅的氧化物薄膜覆盖在胞状晶表面从而减缓了包壳管腐蚀溶解;在质量加速损失阶段,腐蚀溶解以及氧化物脱落导致包壳管加速腐蚀;在质量稳定损失阶段,表面腐蚀溶解和氧化物的生成起到了互相平衡作用;在质量损失趋缓阶段,试样表面出现的密集氧化物,显著缓解了腐蚀溶解,使腐蚀后质量损失速率降低。The cyclic high temperature and high pressure water corrosion system was used to simulate the water chemical condition of primary circuit of pressurized water reactor(PWR)for corrosion test of SiC/SiC_(f) composite cladding tube.The corrosion behavior of SiC/SiC_(f) composite cladding tube was analyzed through mass loss and micro morphology after corrosion.The results show that the SiC/SiC_(f) composite cladding tube experienced mass increase stage,mass acceleration loss stage,mass stability loss stage and mass loss slowing down stage during the corrosion process.During the initial mass increase stage of corrosion,silicon-rich oxide films covered on the surface of cellular crystals,slowing the corrosion dissolution of the cladding tube.In the accelerated mass loss stage,corrosion dissolution and oxide shedding accelerated corrosion of cladding tube.In the mass stability loss stage,the corrosion dissolution and the formation of oxides on the specimen surface played a balance role.In the mass loss slowing down stage,the dense oxides on the specimen surface significantly alleviated the corrosion dissolution and reduced the mass loss rate after corrosion.

关 键 词：SiC/SiC_(f)复合材料包壳管 高温高压水 腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]