羧酸胺阻锈剂在模拟孔隙液和混凝土中对钢筋的阻锈作用  

Carboxylamine Corrosion Inhibitor for Reinforced Steel in Simulated Concrete Pore Solution or Concrete Specimen

作　　者：马麒 蔡景顺[1,2] 穆松 刘凯[1,2] 刘建忠 刘加平 MA Qi;CAI Jingshun;MU Song;LIU Kai;LIU Jianzhong;LIU Jiaping(State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,China;Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]江苏省建筑科学研究院有限公司,高性能土木工程材料国家重点实验室,南京210008 [2]江苏苏博特新材料股份有限公司,南京211103 [3]东南大学材料科学与工程学院,南京211189

出　　处：《材料导报》2022年第23期149-156,共8页Materials Reports

基　　金：国家自然科学基金(51908254);广东省重点领域研发计划项目(2019B111106002)。

摘　　要：本工作采用线性极化(LPR)、动电位极化(PDP)、电化学阻抗谱(EIS)、扫描电子显微镜(SEM)以及混凝土盐水浸烘循环试验,研究了有机羧酸胺阻锈剂(ZX)和三乙烯四胺(TETA)在混凝土模拟孔隙液及混凝土中对钢筋的阻锈作用。结果表明:有机羧酸胺阻锈剂在混凝土模拟孔隙液中可明显抑制钢筋的锈蚀,且随着阻锈剂掺量的增加,阻锈效果越明显。而且有机羧酸胺阻锈剂中的N、O原子能与Fe原子配位成键,强吸附于金属表面,阻止腐蚀过程中电荷转移,抑制金属腐蚀。当掺量为0.30%时,ZX阻锈效率已达90%以上,而三乙烯四胺的阻锈效率为63.74%,在低掺量下ZX抑制钢筋锈蚀的效果明显优于TETA;在混凝土盐水浸烘循环试验中,空白混凝土中钢筋的锈蚀面积百分率超过30%,加入0.60%TETA其锈蚀面积百分率为15.54%,而加入0.60%ZX的钢筋锈蚀面积百分率仅为0.80%,ZX在混凝土试块中亦有良好的阻锈效果。因此,在混凝土中加入有机羧酸胺阻锈剂可提高混凝土结构耐久性,延长其服役寿命。In this work, the inhibited effect of organic carboxylamine(ZX) and triethylenetetramine(TETA) in simulated concrete pore solution and concrete was studied through linear polarization(LPR), potentiodynamic polarization(PDP), electrochemical impedance spectroscopy(EIS), scanning electron microscopy(SEM) and concrete-salt water dry-wet cycle test. The results show that the organic carboxylamine corrosion inhibitor can obviously inhibit the reinforced corrosion in simulated concrete pore solution. As the dosage of inhibitor increases, the inhibited effect is better. Because the N and O atoms in organic carboxylamine corrosion inhibitor adsorb on the metal surface, this organic inhibitor not only can coordinate with Fe atoms to form strongly bonds, but also prevent the charge transfer in the metal corrosion process. When the addition is 0.30 wt%, the inhibition efficiency of ZX is more than 90% and the inhibition efficiency of triethylenetetramine is 63.74%. The inhibited effect of ZX is obviously better than TETA at low dosage. Further, the reinforced corrosion area in the blank group reaches more than 30%, while the corrosion area is 15.54% with 0.60 wt%TETA group and 0.80% with the ZX. Carboxylamine is better inhibition effect in concrete. It can be concluded that adding organic carboxylamine corrosion inhibitor into concrete can improve the concrete structure durability and prolong the service life.

关 键 词：有机羧酸胺 三乙烯四胺 阻锈剂 混凝土 电化学 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]