应用化学 ›› 2025, Vol. 42 ›› Issue (12): 1691-1700.DOI: 10.19894/j.issn.1000-0518.250027

• 研究论文 • 上一篇    下一篇

硝酸根插层水滑石的制备及其对钢筋的阻锈行为

温源1(), 庄燕如1, 洪慧泉2,3   

  1. 1.闽南理工学院智能建造工程学院,泉州 362700
    2.华南理工大学土木与交通学院,广州 510640
    3.中交四航工程研究院有限公司,广州 510230
  • 收稿日期:2025-01-14 接受日期:2025-07-16 出版日期:2025-12-01 发布日期:2025-12-30
  • 通讯作者: 温源
  • 基金资助:
    国家自然科学基金(51972115)

Preparation of Nitrate Intercalated Hydrotalcite and Its Anti-Rust Behavior on Steel Bars

Yuan WEN1(), Yan-Ru ZHUANG1, Hui-Quan HONG2,3   

  1. 1.College of Intelligent Construction Engineering,Minnan University of Science and Technology,Quanzhou 362700,China
    2.Institute of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China
    3.CCCC Fourth Harbor Engineering Institute Co. ,Ltd. ,Guangzhou 510230,China
  • Received:2025-01-14 Accepted:2025-07-16 Published:2025-12-01 Online:2025-12-30
  • Contact: Yuan WEN
  • About author:g1765822347@163.com
  • Supported by:
    the National Natural Science Foundation of China(51972115)

摘要:

传统阻锈剂易分解、时效性差且易污染环境等,本文通过共沉淀法制备硝酸根(NO3-)插层水滑石(LDHs-NO3),系统探究其对氯离子的吸附特性及钢筋腐蚀防护机制。 采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)和扫描电子显微镜(SEM)等手段对LDHs-NO3结构进行表征,结合电化学阻抗谱(EIS)与拉曼光谱分析钝化膜演化规律。 结果表明: LDHs-NO3已成功合成,层间距为0.87 nm,其在pH<7或pH>13条件下呈现显著的结构稳定性劣化,而在中性至弱碱性环境(pH 7~13)中稳定性较好; LDHs-NO3通过离子交换作用实现对氯离子(Cl?)的吸附,其对Cl?最大吸附量达17.90 mmol/g; LDHs-NO3通过“Cl?吸附-NO3-缓释”协同作用,将钢筋腐蚀的Cl?浓度阈值从0.02 mol/L提升至0.1 mol/L。 拉曼光谱与SEM分析表明,LDHs-NO3可调控钝化膜中γ-Fe2O3含量,释放出的NO3-能够在钢筋表面形成致密钝化膜,有效延缓钢筋锈蚀。

关键词: 水滑石, 阻锈机理, 钢筋锈蚀, 氯离子吸附

Abstract:

Aiming at the problems of easy decomposition, poor timeliness, and environmental pollution of traditional corrosion inhibitors, nitrate (NO3-) intercalated hydrotalcite (LDHs-NO3) was prepared by the co-precipitation method, and its adsorption characteristics of chloride ions and corrosion protection mechanism of steel bars were systematically investigated. The structure of LDHs-NO3 was characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer(FT-IR), and scanning electron microscopy (SEM), and the evolution of passive film was analyzed by electrochemical impedance spectroscopy (EIS) and Raman spectroscopy. The results show that LDHs-NO3 has been successfully synthesized, and the interlayer spacing is 0.87 nm. It exhibits significant structural stability degradation at pH<7 or pH>13, and has good stability in neutral to weakly alkaline environments (pH 7~13). LDHs-NO3 achieved the adsorption of chloride ions through ion exchange, and the maximum adsorption capacity of Cl? was 17.90 mmol/g. The synergistic effect of LDHs-NO3 adsorption NO3- slow release increased the Cl? threshold of steel corrosion from 0.02 to 0.1 mol/L. Raman spectroscopy and SEM analysis showed that LDHs-NO3 could regulate the content of γ-Fe2O3 in the passivation film, and the released NO3- could form a dense passivation film on the surface of the steel bar, effectively delaying the corrosion of the steel bar.

Key words: Layered double hydroxides, Inhibition mechanisms, Steel corrosion, Chloride ion adsorption

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