HF溶液中316L应力腐蚀开裂行为研究  

Stress Corrosion Cracking Behavior of 316L in Hydrofluoric Acid Solution

作　　者：张颛利 戴海龙 张喆 石守稳 陈旭[2] ZHANG Zhuanli;DAI Hailong;ZHANG Zhe;SHI Shouwen;CHEN Xu(Industrial Protection Engineering Center,Cnooc Energy Development Equipment Technology Co.,Ltd.,Tianjin 300457,China;School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China)

机构地区：[1]中海油能源发展装备技术有限公司工业防护工程中心,天津300457 [2]天津大学化工学院,天津300072

出　　处：《中国腐蚀与防护学报》2024年第6期1633-1640,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2022YFC3004500)。

摘　　要：采用慢应变速率拉伸试验(SSRT)和微观表征方法对316L不锈钢在HF溶液中的应力腐蚀开裂(SCC)机理进行了研究。316L不锈钢在HF溶液中表现出强烈的应力腐蚀敏感性,力学性能大大下降。应力腐蚀是由初期腐蚀产物膜撕裂以及随后力学和化学协同作用引发的点蚀共同导致的。316L不锈钢在HF溶液中表现出多源启裂特点,晶界、滑移台阶和δ铁素体与基体的相界均是裂纹萌生的主要位点。综上所述,机械变形诱发产物断裂是316L不锈钢在HF溶液中发生SCC的根本原因。The stress corrosion cracking(SCC)behavior of 316L stainless steel in HF solution was investigated by means of slow strain rate test(SSRT)and microscopy characterization.Results revealed that 316L stainless steel showed intense stress corrosion susceptibility in HF solution,correspondingly the mechanical property was greatly shortened for the tested steel.Stress corrosion is caused by the initial tear of the corrosion product film and the subsequent pitting corrosion caused by the synergistic action of mechanics and chemistry.The crack initiation of 316L stainless steel in HF solution shows the characteristics of multi-sites of initiation,i.e.the grain boundary,slip step and phase boundary betweenδferrite and matrix are the main sites of crack initiation.In all,mechanical deformation induced the rupture of corrosion products was essentially the inducement of SCC of 316L stainless steel in HF solution.

关 键 词：氢氟酸 慢应变速率 应力腐蚀开裂 316L 

分 类 号：TG172[金属学及工艺—金属表面处理]