摘要：在模擬壓水堆一回路B/Li水和加鋅水中，采用U彎和慢拉伸（SSRT）實驗研究了加鋅對國產核級不銹鋼（SSs）應力腐蝕行為的影響。結果表明，U彎樣品在高溫高壓水溶液中4500小時的浸泡過程中沒有出現環境致裂現象， 加鋅后緊湊拉伸（CT）敏化SSs樣品的腐蝕開裂敏感性減弱。加鋅水環境中SSs表面致密、穩定氧化膜的生成對抑制其腐蝕開裂起關鍵作用，給出了基于雙層膜模型的SSs表面裂紋形成圖解。

　　關鍵詞：不銹鋼，加鋅，應力腐蝕開裂，高溫水，裂紋生長

 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

　　聯系方式

　　劉俠和：liuxh@alum.imr.ac.cn

責任編輯：趙澤南

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