Corrosion Protection of Steel by NO3− and NO2− Intercalated Mg-Al Layered Double Hydroxides in Simulated Pore Solutions of Alkali-Activated Slag

Author:

Zhong Minxuan1,Xu Jinxia1,Jiang Yiyang1,Wu You1

Affiliation:

1. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China

Abstract

This paper aims to perform a comparative investigation on the corrosion protection of steel in the simulated pore solutions of alkali-activated slag (SH) by NO3− and NO2− intercalated Mg-Al layered double hydroxides (MAL) which were fabricated by the calcination rehydration method. The corrosion potential, electrochemical impedance spectroscopy, potentiodynamic polarization and corrosion condition of steel were measured. Furthermore, changes in the microstructures of NO3− intercalated MAL (MAL-N3) and NO2− intercalated MAL (MAL-N2) before and after the adsorption of chloride ion were observed by X-ray diffraction and Fourier transform infrared spectroscopy. The results show that compared to the simulated concrete pore solution (OPCH), MAL-N3 and MAL-N2 exhibit lower chloride adsorption capacities and better corrosion inhibition effects in SH. The chloride adsorption capacity of MAL-N2 is lower compared with that of MAL-N3 due to the different volumes of intercalated anions. In contrast, MAL-N2 presents superior corrosion inhibition than MAL-N3. Furthermore, the decreases in [OH−] in SH due to the additions of MAL-N3 and MAL-N2 are more prominent than those in OPCH. The different synergistic effects due to the competitive anion-exchanges in the interlayers of NO3− and NO2− intercalated MAL in the two solutions contribute to the above effects.

Funder

Key Research & Development Plan of Jiangsu Province, China

Publisher

MDPI AG

Subject

General Materials Science,Metals and Alloys

Reference38 articles.

1. Scaled-up production of alkali-activated cement in the presence of carbon dioxide for concrete construction;Matalkah;Case Stud. Constr. Mater.,2020

2. Empirical approach for strength prediction of geopolymer stabilized clayey soil using support vector machines;Mozumder;Constr. Build. Mater.,2017

3. Behaviour of RC beam repaired using alkali activated slag-based agent under static and cyclic loading;Laskar;Structures,2021

4. Development and application of an environmentally friendly ductile alkali-activated composite;Nedeljkovic;J. Clean. Prod.,2018

5. Chloride transport and induced steel corrosion in recycled aggregate concrete: A review;Liang;Constr. Build. Mater.,2021

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3