不同镁铝比LDHs对钢筋阻锈性能的影响

摘要/Abstract

摘要： 为了探究镁铝比对MgAl型层状双金属氢氧化物(MgAl-LDHs)的晶体结构、阴离子控释能力及阻锈效果的影响规律,本文采用共沉淀法合成了镁铝摩尔比为2∶1、3∶1和4∶1的MgAl-LDHs,利用XRD和FTIR分析了合成样品的物相组成,并通过氯离子吸附和电化学试验研究了合成样品的氯离子吸附性能及其在模拟混凝土孔溶液中对钢筋的阻锈性能。结果表明,随着镁铝摩尔比从2∶1增至4∶1,LDHs的层间距从0.888 nm降低至0.796 nm,LDHs负载阴离子数减少,氯离子吸附能力降低。掺有Mg₂Al-NO^-₃、Mg₃Al-NO^-₃和Mg₄Al-NO^-₃组的临界氯离子浓度分别为0.16、0.14和0.14 mol/L,分别比空白组的临界氯离子浓度(0.10 mol/L)提高了60%、40%和40%。

关键词: 镁铝比, LDHs, 腐蚀, 氯离子, 层间距, 吸附性能

Abstract: In order to investigate the influences of Mg/Al ratios on crystal structure, anion controlled release ability and rust inhibition effect of MgAl-layered bimetallic hydroxides (MgAl-LDHs), MgAl-LDHs with Mg/Al molar ratios of 2∶1, 3∶1 and 4∶1 were synthesized by co-precipitation method. The phase composition of the synthesized samples was analyzed by XRD and FTIR. The chloride ion adsorption performance of the synthesized samples and their corrosion inhibition effect on steel bar in simulated concrete pore solution were studied by chloride ion adsorption and electrochemical experiments. The results show that with the increase of Mg/Al molar ratios from 2∶1 to 4∶1, the interlayer spacing of LDHs decreases from 0.888 nm to 0.796 nm, resulting in a decrease in the number of LDHs loaded anions and a decrease in chloride ion adsorption capacity. The critical chloride ion concentrations of Mg₂Al-NO^-₃, Mg₃Al-NO^-₃ and Mg₄Al-NO^-₃ doped groups are 0.16, 0.14 and 0.14 mol/L, respectively, which are 60%, 40% and 40% higher than that of the blank group (0.10 mol/L).

Key words: Mg/Al ratio, LDHs, corrosion, chloride ion, interlayer spacing, adsorption capacity

中图分类号:

TU528

易钰奇, 李静, 韦柳媚, 田浩, 庄恩德, 黎雪杰. 不同镁铝比LDHs对钢筋阻锈性能的影响[J]. 硅酸盐通报, 2024, 43(1): 121-127.

YI Yuqi, LI Jing, WEI Liumei, TIAN Hao, ZHUANG Ende, LI Xuejie. Effect of LDHs with Different Mg/Al Ratios on Corrosion Resistance of Steel Bar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 121-127.

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