a (中国科学院金属研究所材料环境腐蚀研究中心,沈阳110016) b (中国工程物理研究院919信箱71分箱,绵阳 621900)
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 Liua,b, Xinqiang Wua*, En-Hou Hana, Xinjian Zhangb, Zhenhong Wangb
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
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