摘要：在模拟压水堆一回路B/Li水和加锌水中，采用U弯和慢拉伸（SSRT）实验研究了加锌对国产核级不锈钢（SSs）应力腐蚀行为的影响。结果表明，U弯样品在高温高压水溶液中4500小时的浸泡过程中没有出现环境致裂现象， 加锌后紧凑拉伸（CT）敏化SSs样品的腐蚀开裂敏感性减弱。加锌水环境中SSs表面致密、稳定氧化膜的生成对抑制其腐蚀开裂起关键作用，给出了基于双层膜模型的SSs表面裂纹形成图解。

　　关键词：不锈钢，加锌，应力腐蚀开裂，高温水，裂纹生长

 Effects of Zn injection on the stresscorrosioncracking behaviors of domestic nuclear-grade stainless steels in high temperature aqueous environment
Xiahe Liu^a,b, Xinqiang Wu^a*, En-Hou Han^a, Xinjian Zhang^b, Zhenhong Wang^b
a( Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016)
^b(China Academy of Engineering Physics, P.O. Box 919-71, Mianyang, 621900)
^*(Corresponding author, Fax: +86 24 2389 4149. E-mail address: xqwu@imr.ac.cn)

　　Abstract:Stress corrosion cracking （SCC） of sensitized 304 stainless steel （SS） in borated and lithiated high temperature water without and with Zn injection was studied using U bent test and slow stain rate test （SSRT）。The U-bent tests show that the samples of sensitized SSs in high temperature water without/with Zn immersion for 4500 hours have been found no significant environmental assisted cracking.the SSRT tests show that the sensitized SSs CT samples have a lower susceptibility to environmental assisted cracking in Zn environment. The stable oxides formed on SSs in ZWC environment play a key role on suppression of the cracking, the model of crack tip based on duplex layer model is given to explain the phenomenon.

　　Key words:stainless steel, Zn injection, stress corrosion cracking, high temperature water, crack growth

　　联系方式

　　刘侠和：liuxh@alum.imr.ac.cn