Effect of LDHs with Different Mg/Al Ratios on Corrosion Resistance of Steel Bar

Abstract

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

CLC Number:

TU528

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.

References

[1] 赵景锋, 裘泳, 陈柳君, 等. 氯盐环境下钢筋混凝土结构电化学修复效果研究现状[J]. 硅酸盐通报, 2019, 38(12): 3868-3872+3877.
ZHAO J F, QIU Y, CHEN L J, et al. Research status of electrochemical repair effect of reinforced concrete structure under chloride environment[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(12): 3868-3872+3877 (in Chinese).
[2] 陈宣东, 荣华, 梁秒梦, 等. 基于随机细观骨料的钢筋表面氯离子浓度概率分布研究[J]. 硅酸盐通报, 2021, 40(11): 3593-3600.
CHEN X D, RONG H, LIANG M M, et al. Probability distribution of chloride ion concentration on surface of reinforcing bar based on random meso-aggregate[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(11): 3593-3600 (in Chinese).
[3] 肖力光, 李正鹏. 混凝土耐久性的影响因素及研究进展[J]. 混凝土, 2022(12): 1-5+16.
XIAO L G, LI Z P. Influencing factors and research progress of concrete durability[J]. Concrete, 2022(12): 1-5+16 (in Chinese).
[4] ZHANG Z M, CHEN R, HU J, et al. Corrosion behavior of the reinforcement in chloride-contaminated alkali-activated fly ash pore solution[J]. Composites Part B: Engineering, 2021, 224: 109215.
[5] GUO B B, QIAO G F, HAN P, et al. Effect of natural carbonation on chloride binding behaviours in OPC paste investigated by a thermodynamic model[J]. Journal of Building Engineering, 2022, 49: 104021.
[6] 路承功, 魏智强, 乔宏霞, 等. 基于3参数Weibull分布钢筋混凝土盐腐蚀环境中可靠性寿命分析[J]. 工程科学学报, 2021, 43(4): 512-520.
LU C G, WEI Z Q, QIAO H X, et al. Reliability life analysis of reinforced concrete in a salt corrosion environment based on a three-parameter Weibull distribution[J]. Chinese Journal of Engineering, 2021, 43(4): 512-520 (in Chinese).
[7] WANG X Y, LEE S, CHO H. Penetration properties and injecting conditions of corrosion inhibitor for concrete[J]. Construction and Building Materials, 2021, 284: 122761.
[8] 赵艳亮, 赵景茂. 层状双金属氢氧化物对镁合金的保护作用及自愈性能研究进展[J]. 中国腐蚀与防护学报, 2023, 43(1): 1-5.
ZHAO Y L, ZHAO J M. Research progress on protective effect and self-healing performance of layered bimetallic hydroxide on magnesium alloys[J]. Journal of Chinese Society for Corrosion and Protection, 2023, 43(1): 1-5 (in Chinese).
[9] 李战国, 纪文军, 李悦, 等. 层状双金属氢氧化物在水泥混凝土中的应用研究进展[J]. 混凝土, 2021(1): 25-30+35.
LI Z G, JI W J, LI Y, et al. Research progress on application of layered double hydroxides in cement concrete[J]. Concrete, 2021(1): 25-30+35 (in Chinese).
[10] XU J X, WEI J F, MA G X, et al. Effect of MgAl-NO₂ LDHs inhibitor on steel corrosion in chloride-free and contaminated simulated carbonated concrete pore solutions[J]. Corrosion Science, 2020, 176: 108940.
[11] 许闯, 张祖华, 陈慕翀, 等. 层状双金属氢氧化物在水泥混凝土中的形成、作用机制及应用[J]. 材料导报, 2022, 36(11): 99-105.
XU C, ZHANG Z H, CHEN M C, et al. Formation, interaction mechanisms and application of layered double hydroxides in cement concrete[J]. Materials Reports, 2022, 36(11): 99-105 (in Chinese).
[12] CAO Y H, ZHENG D J, ZHANG F, et al. Layered double hydroxide (LDH) for multi-functionalized corrosion protection of metals: a review[J]. Journal of Materials Science & Technology, 2022, 102: 232-263.
[13] 宋迎宾, 徐金霞, 蒋林华, 等. NO^-₃/NO^-₂插层MgAl-LDHs在混凝土模拟孔溶液中的阻锈性能[J]. 浙江大学学报(工学版), 2018, 52(12): 2397-2405.
SONG Y B, XU J X, JIANG L H, et al. Anti-corrosion performance of NO^-₃/NO^-₂ intercalation of MgAl-LDHs in simulated concrete pore solution[J]. Journal of Zhejiang University (Engineering Science), 2018, 52(12): 2397-2405 (in Chinese).
[14] 陈梦竹. LDHs固结氯离子机理及对钢筋腐蚀行为影响的研究[D]. 重庆: 重庆大学, 2020.
CHEN M Z. Study on the mechanism of consolidation of chloride ions by LDHs and its influence on corrosion behavior of steel bars[D].Chongqing: Chongqing University, 2020 (in Chinese).
[15] CHEN M Z, WU F, YU L W, et al. Chloride binding capacity of LDHs with various divalent cations and divalent to trivalent cation ratios in different solutions[J]. CrystEngComm, 2019, 21(44): 6790-6800.
[16] LIU H M, ZHAO X J, ZHU Y Q, et al. DFT study on MgAl-layered double hydroxides with different interlayer anions: structure, anion exchange, host-guest interaction and basic sites[J]. Physical Chemistry Chemical Physics: PCCP, 2020, 22(4): 2521-2529.
[17] 徐松, 罗宇洋, 黄润雨, 等. 有机LDHs的制备及其对沥青抗紫外老化性能的影响[J]. 武汉理工大学学报, 2023, 45(7): 7-13.
XU S, LUO Y Y, HUANG R Y, et al. Preparation of organic LDHs and their effects on the UV aging resistance of asphalt[J]. Journal of Wuhan University of Technology, 2023, 45(7): 7-13 (in Chinese).
[18] 赵栋, 白志民. 月桂酸插层Mg/Al-NO^-₃-LDHs及其摩擦性能评价[J]. 硅酸盐通报, 2012, 31(4): 841-846+851.
ZHAO D, BAI Z M. Preparation of Mg/Al-NO^-₃-LDHs intercalated with dodecanoic acid and investigation of its tribological characteristics[J]. Bulletin of the Chinese Ceramic Society, 2012, 31(4): 841-846+851 (in Chinese).
[19] 陈龙, 陈栋, 刘荣桂, 等. 掺水滑石生态混凝土物理力学及水质净化性能研究[J]. 硅酸盐通报, 2019, 38(3): 834-840.
CHEN L, CHEN D, LIU R G, et al. Physical mechanic and water purification performance of eco-concrete doping with hydrotalcite[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(3): 834-840 (in Chinese).
[20] ZUO X B, LI X N, LIU Z Y, et al. Electrochemical and microstructural study on depassivation of ductile iron surface in chloride-contained simulated cement-mortar pore solution[J]. Construction and Building Materials, 2019, 229: 116907.
[21] 卢金马, 黄俊铭, 余波, 等. 电极工作面积和孔隙液pH值对钢筋脱钝临界氯离子浓度的影响[J]. 建筑材料学报, 2021, 24(5): 994-1001.
LU J M, HUANG J M, YU B, et al. Influence of working area of electrode and pH value of pore solution on critical chloride concentration for steel bar depassivation[J]. Journal of Building Materials, 2021, 24(5): 994-1001 (in Chinese).
[22] 徐金霞, 吴悠, 喻林. LDHs对碱激发矿渣模拟孔隙液中钢筋Cl^-腐蚀的影响[J]. 东南大学学报(自然科学版), 2021, 51(4): 647-657.
XU J X, WU Y, YU L. Effects of LDHs on chloride-induced corrosion of rebar in simulated pore solutions of alkali activated slag[J]. Journal of Southeast University (Natural Science Edition), 2021, 51(4): 647-657 (in Chinese).
[23] AZZAOUI K, MEJDOUBI E, JODEH S, et al. Eco friendly green inhibitor gum arabic (GA) for the corrosion control of mild steel in hydrochloric acid medium[J]. Corrosion Science, 2017, 129: 70-81.
[24] 刘国建, 朱航, 张云升, 等. 混凝土孔溶液中不同侵蚀离子对钢筋的腐蚀行为[J]. 硅酸盐学报, 2022, 50(2): 413-419.
LIU G J, ZHU H, ZHANG Y S, et al. Corrosion behavior of steel subjected to different corrosive ions in simulated concrete pore solution[J]. Journal of the Chinese Ceramic Society, 2022, 50(2): 413-419 (in Chinese).
[25] LI J, LUO M S, CHEN Z, et al. Anti-corrosion mechanism of MgAl-LDHs inhibitors with varying anionic charge on reinforcing steel in simulated concrete pore solutions[J]. Construction and Building Materials, 2023, 363: 129882.