Preparation and Research on 2-Methylimidazole-Lanthanum Nickel-Based Sol-Gel Conversion Coating for Oxide Scale Reinforcement Bars

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Buildings Pub Date : 2025-11-26 DOI:10.3390/buildings15234272

Yuhao Xie, Yanwei Zeng, Xinwei Wang, Yuxin Bai, Guozhe Meng

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引用次数: 0

Abstract

Corrosion induced by defective oxide scales severely compromises the durability of concrete structures. This study develops a dual-mechanism sol-gel protection strategy based on La3+/Ni2+/2-Methylimidazole (2-MI). First, 2-Methylimidazole-catalyzed epoxy ring-opening constructs defect-minimized Si–O–Si/C–O–C networks through 60 °C low-temperature curing, reducing microcrack formation and curing energy consumption compared to conventional 130 °C processing. Second, utilizing 400 °C waste heat from hot-rolled steel triggers pH-modulated La2O3/NiO co-deposition within oxide scale defects, enhancing corrosion resistance. After a 40-day immersion in SCP + 0.1 M NaCl, the coated reinforcement exhibits a low-frequency impedance modulus of 25.6 kΩ·cm2, achieving a 10.4-fold increase over untreated steel. Specimens embedded in 3.5 wt% NaCl mortar demonstrate a 120-day impedance modulus of 74.63 kΩ·cm2, exceeding the control by 8.03-fold. This strategy integrates efficient industrial waste heat utilization with energy-saving low-temperature curing, providing long-term corrosion protection for marine concrete structures.

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氧化皮钢筋用2-甲基咪唑-镧镍基溶胶-凝胶转化涂料的制备与研究

氧化膜缺陷引起的腐蚀严重损害了混凝土结构的耐久性。本研究开发了一种基于La3+/Ni2+/2-甲基咪唑（2-MI）的双机制溶胶-凝胶保护策略。首先，2-甲基咪唑催化环氧开环通过60°C的低温固化构建了缺陷最小化的Si-O-Si /C -o - C网络，与传统的130°C固化工艺相比，减少了微裂纹的形成和固化能耗。其次，利用热轧钢产生的400°C余热，在氧化垢缺陷内触发ph调制的La2O3/NiO共沉积，增强耐腐蚀性。在SCP + 0.1 M NaCl中浸泡40天后，涂层钢筋的低频阻抗模量为25.6 kΩ·cm2，比未处理钢提高了10.4倍。埋于3.5 wt% NaCl砂浆中的试件120天阻抗模量为74.63 kΩ·cm2，比对照高出8.03倍。该策略将高效的工业余热利用与节能的低温养护相结合，为海洋混凝土结构提供长期的防腐保护。

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来源期刊

Buildings Multiple-

CiteScore

3.40

自引率

26.30%

发文量

1883

审稿时长

11 weeks

期刊介绍： BUILDINGS content is primarily staff-written and submitted information is evaluated by the editors for its value to the audience. Such information may be used in articles with appropriate attribution to the source. The editorial staff considers information on the following topics: -Issues directed at building owners and facility managers in North America -Issues relevant to existing buildings, including retrofits, maintenance and modernization -Solution-based content, such as tips and tricks -New construction but only with an eye to issues involving maintenance and operation We generally do not review the following topics because these are not relevant to our readers: -Information on the residential market with the exception of multifamily buildings -International news unrelated to the North American market -Real estate market updates or construction updates