ZIF-8 Modified Ce-Sol-gel Film on Rebar for Enhancing Corrosion Resistance  

作　　者：Yanwei Zeng Peng Xu Guoqiang Liu Tianguan Wang Bing Lei Zhiyuan Feng Ping Zhang Guozhe Meng 

机构地区：[1]Marine Corrosion and Protection Team,School of Chemical Engineering and Technology,Sun Yat-sen University,Zhuhai,519082,China [2]Key Laboratory of Harbor and Marine Structure Durability Technology,Ministry of Transport,CCCC Fourth Harbor Engineering Institute Co.,Ltd,Guangzhou,Guangzhou,510220,China [3]Department of Civil and Environmental Engineering,Faculty of Science and Technology,University of Macao,Taipa,Macao SAR,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第12期2121-2135,共15页金属学报（英文版）

基　　金：support from the National Key R&D Program of China(No.2019YFE0111000);the National Natural Science Foundation of China(Nos.52171093,51771061 and U20A20233).

摘　　要：Chloride-induced corrosion of steel reinforcement is the key factor leading to the degradation of reinforced concrete building durability.Improving the corrosion resistance of oxide scale of rebar has always been a research hotspot in the field of civil engineering materials.A ZIF-8 modified Ce-Sol-gel(ZCS)film was prepared on oxide scale of plain steel rebars by sol-gel method.It is observed that the|Z|_(0.01 Hz)value of the ZCS film reached 320 kΩcm^(2),which is about 29 times higher than that of blank rebar in simulated concrete pore(SCP)solution with 0.1 M NaCl.Then,they were inserted into mortar block and curing them in a curing box at T=20±2℃and RH=95±2%for 28 days.Subsequently,these samples were subject to electrochemical impedance spectroscopy in 3.5 wt%NaCl.The|Z|_(0.01 Hz)value of the rebar with the ZCS film was six times higher than that of the blank rebar after immersing for 20 days,resulting in an overall increase in corrosion resistance for rebar.The results indicated that the modification by ZIF-8 could reduce the porosity of Ce-sol-gel(CS)film and improved the“labyrinth effect”of the film.Additionally,the negative charge on the surface of ZIF-8 in alkaline condition increased the repulsion effect with Cl−,significantly reducing the sensitivity of rebar to Cl−.

关 键 词：Chloride corrosion Oxide scale REBAR SOL-GEL Corrosion resistance 

分 类 号：TG17[金属学及工艺—金属表面处理]