[1]徐金霞,谭启平,蒋林华,等.SO2-4对MgAl-LDHs吸附Cl-和阻锈性能的影响[J].东南大学学报(自然科学版),2019,49(3):507-513.[doi:10.3969/j.issn.1001-0505.2019.03.015]
 Xu Jinxia,Tan Qiping,Jiang Linhua,et al.Influence of SO2-4on adsorption of Cl-and rust resistance of MgAl-LDHs[J].Journal of Southeast University (Natural Science Edition),2019,49(3):507-513.[doi:10.3969/j.issn.1001-0505.2019.03.015]
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SO2-4对MgAl-LDHs吸附Cl-和阻锈性能的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第3期
页码:
507-513
栏目:
材料科学与工程
出版日期:
2019-05-20

文章信息/Info

Title:
Influence of SO2-4on adsorption of Cl-and rust resistance of MgAl-LDHs
作者:
徐金霞谭启平蒋林华梅友静
河海大学力学与材料学院, 南京210098
Author(s):
Xu Jinxia Tan Qiping Jiang Linhua Mei Youjing
College of Materials and Mechanics, Hohai University, Nanjing 210098, China
关键词:
镁铝层状双氢氧化物 氯离子 硫酸根离子 等温吸附 缓蚀性能
Keywords:
Mg-Al layered double hydroxide chloride ion sulfate ion equilibrium isotherm corrosion inhibition
分类号:
TU528.042
DOI:
10.3969/j.issn.1001-0505.2019.03.015
摘要:
通过共沉积法制备Mg-Al层状双金属氢氧化合物(MgAl-LDHs),以碱性溶液模拟混凝土孔溶液,通过等温吸附试验、自腐蚀电位(Ecorr)、电化学阻抗谱(EIS)研究了SO2-4和Cl-共存环境下MgAl-LDHs的吸附性能及对混凝土中钢筋腐蚀的阻锈性能.此外,通过X射线衍射(XRD)和傅里叶变换红外光谱(FTIR)对LDHs微结构进行观测,揭示其作用机理.结果表明:MgAl-LDHs对Cl-和SO2-4离子的吸附过程符合Langmuir等温吸附模型,最大吸附量分别为2.853、1.587 mmol/g,SO2-4的存在会抑制MgAl-LDHs对于Cl-的吸附;MgAl-LDHs对钢筋具有明显的缓蚀效果,且随着SO2-4含量的增加,钢筋腐蚀先缓解后加剧;MgAl-LDHs对Cl-吸附是其缓蚀的主要原因.而随着SO2-4含量的增加,反应生成石膏在钢筋表面吸附是钢筋腐蚀先缓解的原因,但MgAl-LDHs会优先吸附SO2-4,导致残余的Cl-增加,钢筋腐蚀加剧.
Abstract:
Mg-Al layered double hydroxides(MgAl-LDHs)were prepared by traditional co-deposition methods. The adsorption property and the corrosion inhibition of the prepared MgAl-LDHs on the steel corrosion in the presence of chloride and sulfate were studied. In the alkaline solution simulating the pore solution of concrete, the equilibrium isotherm, the corrosion potential(Ecorr)and electrochemical impedance spectroscopy(EIS)were used to measure the adsorption property and the corrosion inhibition of the prepared MgAl-LDHs on the steel corrosion. Besides, the microstructures of MgAl-LDHs were obtained by X-ray diffraction(XRD)and Fourier transform infrared spectroscopy(FTIR). The results show that the adsorption data of MgAl-LDHs on chloride and sulfate are in accordance with Langmuir isothermal model. The maximum adsorption capacities of the chloride and the sulfate are 2.853 and 1.587 mmol/g, respectively. The presence of sulfate ions affects the adsorption of chloride ions. The prepared MgAl-LDHs have obvious corrosion inhibition effects on steel bars. In addition, with the increase of sulfate ions, the steel corrosion is firstly alleviated and then increased. The corrosion inhibition of MgAl-LDHs is mainly attributed to the binding of chloride ions on MgAl-LDHs. Furthermore, the adsorption of gypsum formed by the reaction of sulfate ions and calcium hydroxide on the steel surface contributes to the initial alleviation of steel corrosion. However, the preferred binding of sulfate ions on LDHs increases the amount of chloride ions in the solution, thus the steel corrosion is then increased.

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备注/Memo

备注/Memo:
收稿日期: 2018-10-30.
作者简介: 徐金霞(1972—),男,博士,教授,xujinxia@hhu.edu.cn.
基金项目: 国家自然科学基金面上资助项目(51478164)、江苏省自然科学基金面上资助项目(BK20181306).
引用本文: 徐金霞,谭启平,蒋林华,等.SO2-4对MgAl-LDHs吸附Cl-和阻锈性能的影响[J].东南大学学报(自然科学版),2019,49(3):507-513. DOI:10.3969/j.issn.1001-0505.2019.03.015.
更新日期/Last Update: 2019-05-20