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

Abstract

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

CLC Number:

TQ174.4

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.

Figures/Tables 11

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References 30

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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

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

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

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