核电厂闭式冷却水系统中烯基胺乙基咪唑啉的缓蚀性能  

Corrosion Inhibition of Enamine Ethyl Imidazoline in Closed Cooling Water System of Nuclear Power Plants

作　　者：肖艳 田朝晖 林根仙[1,2] 王琳 宋利君 孙云[1,2] XIAO Yan;TIAN Zhaohui;LIN Genxian;WANG Lin;SONG Lijun;SUN Yun(Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou 215004,China;National Engineering Research Center for Nuclear Power Plant Safety&Reliability,Suzhou 215004,China;Nuclear and Radiation Safety Center,MEE,Beijing 102445,China)

机构地区：[1]苏州热工研究院有限公司,苏州215004 [2]国家核电厂安全及可靠性工程技术研究中心,苏州215004 [3]生态环境部核与辐射安全中心,北京102445

出　　处：《腐蚀与防护》2024年第11期17-22,43,共7页Corrosion & Protection

摘　　要：采用浸泡腐蚀试验、电化学测试和表面分析等方法,在模拟核电站闭式冷却水(CCW)系统工况下,研究了烯基胺乙基咪唑啉(IM)缓蚀剂对CCW系统关键材料20G碳钢的缓蚀效果,分析了其缓蚀机理,并通过热重分析考察了IM在CCW系统环境中的热稳定性。结果表明:当IM质量分数为30 mg/kg时,其对20G碳钢的缓蚀率就可达到99%以上;在除盐水中添加60 mg/kg IM就可与添加75 mg/kg磷酸钠起到相同的缓蚀效果(缓蚀率99.9%以上);随着IM含量增加,20G碳钢的自腐蚀电位正移,腐蚀电流密度减小;IM分子在240℃左右开始发生分解,到500℃基本分解完成。IM为阳极型缓蚀剂,通过吸附在20G碳钢表面形成保护膜缓解其腐蚀。The corrosion inhibition of enamine ethyl imidazoline(IM)to 20G carbon steel,a key material of closed cooling water(CCW)system,was studied by immersion corrosion test,electrochemical test and surface analysis under the simulated operating conditions of CCW system in nuclear power plants,and its inhibition mechanism was analyzed.The thermal stability analysis of IM in the CCW system environment was investigated by thermogravimetric analysis.When the mass fraction of IM was 30 mg/kg,the inhibition efficiency of IM to 20G carbon steel could reach more than 99%.Adding 60 mg/kg IM into demineralized water had the same corrosion inhibition effect as adding 75 mg/kg sodium phosphate(corrosion inhibition efficiency more than 99.9%).With the increase of IM content,the free corrosion potential of 20G carbon steel moved forward and the corrosion current density decreased.The IM molecules began to decompose at about 240℃,and the decomposition was basically completed at 500℃.IM is an anodic corrosion inhibitor,which alleviates corrosion by adsorbing and forming a protective film on the surface of 20G carbon steel.

关 键 词：咪唑啉 20G碳钢 闭式冷却水(CCW) 缓蚀 吸附 

分 类 号：TG174[金属学及工艺—金属表面处理]