NO2-改性水滑石的制备及其对钢筋阻锈性能研究

doi:10.19964/j.issn.1006-4990.2024-0477

摘要/Abstract

摘要：

针对传统亚硝酸钙阻锈剂存在的时效性不足和环境风险的问题，创新性地采用水热法将NO₂^-插层到Zn-Al-LDHs制备了改性水滑石（LDHs-NO₂），并通过电化学阻抗谱分析和离子色谱技术，系统探究了LDHs-NO₂在模拟混凝土孔隙溶液（SCP）中的稳定性、氯离子吸附性能及其对钢筋的阻锈性能。结果表明：LDHs-NO₂的稳定性具有显著的pH依赖性，在pH为7.0~13.0时保持良好的稳定性，在强碱（pH>13.0）或酸性（pH<7.0）条件下易发生溶解；此外，LDHs-NO₂凭借独特的层间离子交换机制，展现出优异的氯离子吸附性能，其理论最大吸附量为16.71 mmol/g，显著降低了腐蚀性氯离子对钢筋的侵蚀风险。电化学测试证实，在SCP溶液中当LDHs-NO₂的添加量为0.5%（质量分数）时，钢筋的临界氯离子浓度阈值从0.02 mol/L显著提升至0.10 mol/L。该研究不仅为克服传统阻锈材料的技术瓶颈提供了创新解决方案，更为发展环境友好、长效稳定的新型阻锈材料奠定了理论基础，对推动土木工程领域的绿色可持续发展具有重要的科学价值和应用前景。

关键词: 水滑石, 阻锈机理, 稳定性, 钢筋锈蚀, 氯离子吸附

Abstract:

In this study，NO₂^- intercalated Zn-Al-LDHs（LDHs-NO₂） were innovatively prepared by hydrothermal method to solve the problem of insufficient timeliness and environmental risk of traditional calcium nitrite corrosion inhibitors.The stability of LDHs-NO₂ in simulated concrete pore solution（SCP），chloride ion adsorption performance and corrosion resistance of steel bars were systematically investigated by electrochemical impedance spectroscopy and ion chromatography.The results showed that the stability of LDHs-NO₂ was significantly pH-dependent.It maintained good stability in the range of pH 7.0~13.0，while it was easy to dissolve in strong alkali（pH>13.0） or acidic（pH<7.0） conditions.In addition，LDHs-NO₂ exhibited excellent chloride ion adsorption performance due to its unique interlayer ion exchange mechanism.The theoretical maximum adsorption capacity of LDHs-NO₂ was 16.71 mmol/g，which significantly reduced the erosion risk of corrosive chloride ions on steel bars.Electrochemical tests confirmed that when the addition amount of LDHs-NO₂ was 0.5% in SCP solution，the critical chloride ion concentration threshold of the steel bar was significantly increased from 0.02 mol/L to 0.10 mol/L.This study not only provided an innovative solution to overcome the technical bottleneck of traditional rust-resistant materials，but also laid a theoretical foundation for the development of environmentally friendly，long-term and stable new rust-resistant materials.It had important scientific value and application prospects for promoting green and sustainable development in the field of civil engineering.

Key words: hydrotalcite, inhibition mechanism, stability, steel corrosion, chloride ion adsorption

中图分类号:

TQ174.4

王志刚, 胡晓东, 王辉, 薛亮钢, 田健强. NO₂^-改性水滑石的制备及其对钢筋阻锈性能研究[J]. 无机盐工业, 2025, 57(8): 74-81.

WANG Zhigang, HU Xiaodong, WANG Hui, XUE Lianggang, TIAN Jianqiang. Study on preparation of NO₂^- modified hydrotalcite and its corrosion resistance to steel bars[J]. Inorganic Chemicals Industry, 2025, 57(8): 74-81.

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项目	Cl^-/ （mol·L^-1）	R_s/ （Ω·cm²）	R_f/ （kΩ·cm²）	Q_f/ （μF·cm^-2）	n_f	R_ct/ （kΩ·cm²）	Q_dl/ （μF·cm^-2）	n_dl
基准组	0	24.48	39.19	2.91×10^-5	0.939	512.38	5.59×10^-5	0.958
	0.01	22.11	21.03	1.88×10^-5	0.938	403.14	3.44×10^-5	0.955
	0.02	21..75	3.96	1.29×10^-5	0.917	6.19	4.63×10^-5	0.873
对照组	0	35.12	156.14	2.51×10^-5	0.964	893.42	4.77×10^-5	0.806
	0.02	34.93	263.39	2.51×10^-5	0.966	1 089.71	5.16×10^-5	0.938
	0.04	32.54	286.76	3.13×10^-5	0.980	1 251.95	5.02×10^-5	0.912
	0.06	24.22	357.61	4.37×10^-5	0.972	1 449.58	4.62×10^-5	0.979
	0.08	21.05	165.54	3.79×10^-5	0.949	658.33	4.18×10^-5	0.952
	0.10	20.32	3.71	2.28×10^-5	0.902	8.37	4.47×10^-5	0.974

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NO₂^-改性水滑石的制备及其对钢筋阻锈性能研究

Study on preparation of NO₂^- modified hydrotalcite and its corrosion resistance to steel bars

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