文献类型：期刊文献

英文题名：Inhibiting property of nitrite intercalated layered double hydroxide for steel reinforcement in contaminated concrete condition

作者：Tian, Yuwan[1,2];Wen, Cheng[1,2];Wang, Gui[1];Deng, Peichang[1];Mo, Wanwan[1]

机构：[1]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524088, Peoples R China;[2]Univ Sci & Technol Beijing, Corros & Protect Ctr, Beijing 100083, Peoples R China

年份：2020

卷号：50

期号：8

起止页码：835

外文期刊名：JOURNAL OF APPLIED ELECTROCHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000535395700004)、、EI(收录号：20202208763759)、Scopus(收录号：2-s2.0-85085476933)、WOS

基金：This work was supported by National Natural Science Foundation of China (No. 51801033).

语种：英文

外文关键词：Controlled-release; LDH; Corrosion; Oxide film; Electronic property

外文摘要：A nitrite intercalated layered double hydroxide (LDH-NO2) was suggested as an intelligent corrosion inhibitor to provide smart corrosion protection triggered by aggressive ions. A comparison of the inhibiting properties between NaNO2 and LDH-NO2 in the gradually contaminated concrete pore solution was investigated using electrochemical impedance spectroscopy, Mott-Schottky analysis and X-ray photoelectron spectroscopy. The results show that LDH-NO2 exhibits better long-term inhibition performance, and the aggressive ion thresholds for inducing corrosion are 0.1, 0.4, and 0.8 wt% in the blank, NaNO2, and LDH-NO2 solutions, respectively. The reason for this excellent inhibition efficiency is that nitrites can release in time and on demand from the LDH, preventing the corrosion nucleation and metastable pitting corrosion of steel reinforcement caused by chlorides. Graphic abstract LDH-NO2 exhibits better long-term inhibition performance when compared with NaNO2. The reason for this excellent inhibition efficiency is that nitrites can release in time and on demand from the LDH, preventing the corrosion nucleation and metastable pitting corrosion of steel reinforcement caused by chlorides.