类沸石锌基咪唑酯金属有机框架阻锈剂在钢筋砂浆中的阻锈作用及机理  

Inhibition Effect and Mechanism of Zeolitic Imidazolate Frameworks MOF Corrosion Inhibitors in Reinforced Mortar

作　　者：王羊洋 胡捷[1,3] 黄浩良 韦江雄 余其俊[1,3] WANG Yangyang;HU Jie;HUANG Haoliang;WEI Jiangxiong;YU Qijun(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;ShandongProvincial Key Lab for the Preparation and Measurement of Building Materials,University of Jinan,Jinan 250022,China;Guangdong Low Carbon Technologies Engineering Centre for Building Materials,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]济南大学,建筑材料制备与测试技术重点实验室,济南250022 [3]广东省建筑材料低碳技术工程技术研究中心,广州510640

出　　处：《硅酸盐学报》2025年第3期539-552,共14页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2023YFC3903600);国家自然科学基金(U2001225,52278258,52078149,52408263);广东省自然科学基金(2022A1515011718,2024A1515010048);山东省自然科学基金ZR2024QE391。

摘　　要：内掺有机阻锈剂是延缓海洋混凝土工程中钢筋锈蚀发生的重要手段。基于金属有机框架材料多吸附位点的结构特征,采用共沉淀法制备了类沸石锌基咪唑酯(ZIF-8)作为钢筋混凝土阻锈剂,研究了ZIF-8阻锈剂对钢筋砂浆电化学行为,钢筋表面产物组成和钢筋/砂浆界面特征的影响。结果表明:ZIF-8阻锈剂有效延长了钢筋砂浆试件的锈蚀诱发时间,且阻锈效率随着ZIF-8阻锈剂掺量的提高而增大;浸泡180 d后,内掺0.8%(质量分数)ZIF-8阻锈剂的阻锈效率为62.1%。ZIF-8阻锈剂不仅提高了钢筋表面Fe OOH和Fe_(2)O_(3)2类具有高保护性产物的相对含量,同时也降低了钢筋/砂浆界面处浆体孔隙率和氯离子含量。Introduction Chloride induced corrosion damage of the embedded reinforcement is one of primary reasons for the deterioration of concrete structures in civil engineering.Admixing organic corrosion inhibitors are considered as an effective way to halt the corrosion damage of the embedded reinforcement for its convenient use and high cost-efficiency.However,the corrosion inhibition efficiency of conventional corrosion inhibitors exists due to the limited amount of adsorption functional groups in molecular structures.It is thus essential to develop novel corrosion inhibitors with a great adsorption capacity to satisfy the efficient corrosion protection of reinforcement concrete in harsh marine conditions.As typical crystalline hybrid materials,metal-organic frameworks(MOFs)are self-assembled via coordination between metal nodes and organic ligands.Zeolitic imidazolate frameworks(ZIF-8,a representative MOF material)exhibit many heteroatoms andπ-electron system,thus enabling its interaction and high corrosion inhibition potential for reinforced concrete.In this study,ZIF-8 corrosion inhibitors were synthesized and its inhibition effect for reinforced mortar was investigated.In addition,the characteristics of the reinforcement/mortar interface were also evaluated by image analysis based on scanning electron microspcopy(SEM)images and chloride titration.Methods In the experiments,0.60 g Zn(NO3)2⋅6H2O was dissolved in 4.5 mL deionized water.11.50 g 2-methylimidazole was dissolved in 40.0 mL deionized water.The zinc nitrate solution above was then added into 2-MeIm solution in dropwise under stirring.After stirring for 24 h,white ZIF-8 corrosion inhibitors were collected via centrifugation at 10000 r/min and then cleaned with deionized water for three times.The water to cement(w/c)ratio was 0.5 and the sand to cement(s/c)ratio was 3.The dosage of ZIF-8 corrosion inhibitors was 0%(blank),0.2%,0.4%and 0.8%per dry cement weight in mortar specimen,respectively.The reinforcement electrode was centrally embedded in cylindrica

关 键 词：钢筋锈蚀 类沸石锌基咪唑酯阻锈剂 电化学行为 钢筋/砂浆界面 

分 类 号：TU528.042[建筑科学—建筑技术科学]