ZIF-8 Modified Ce–Sol–gel Film on Rebar for Enhancing Corrosion Resistance

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-10-12 DOI:10.1007/s40195-024-01768-z
Yanwei Zeng, Peng Xu, Guoqiang Liu, Tianguan Wang, Bing Lei, Zhiyuan Feng, Ping Zhang, Guozhe Meng
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Abstract

Chloride-induced corrosion of steel reinforcement is the key factor leading to the degradation of reinforced concrete building durability. Improving the corrosion resistance of oxide scale of rebar has always been a research hotspot in the field of civil engineering materials. A ZIF-8 modified Ce–Sol–gel (ZCS) film was prepared on oxide scale of plain steel rebars by sol–gel method. It is observed that the |Z|0.01 Hz value of the ZCS film reached 320 kΩ cm2, which is about 29 times higher than that of blank rebar in simulated concrete pore (SCP) solution with 0.1 M NaCl. Then, they were inserted into mortar block and curing them in a curing box at T = 20 ± 2 °C and RH = 95 ± 2% for 28 days. Subsequently, these samples were subject to electrochemical impedance spectroscopy in 3.5 wt% NaCl. The |Z|0.01 Hz value of the rebar with the ZCS film was six times higher than that of the blank rebar after immersing for 20 days, resulting in an overall increase in corrosion resistance for rebar. The results indicated that the modification by ZIF-8 could reduce the porosity of Ce–sol–gel (CS) film and improved the “labyrinth effect” of the film. Additionally, the negative charge on the surface of ZIF-8 in alkaline condition increased the repulsion effect with Cl, significantly reducing the sensitivity of rebar to Cl.

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用于增强钢筋耐腐蚀性的 ZIF-8 改性水泥溶胶凝胶薄膜
氯化物引起的钢筋腐蚀是导致钢筋混凝土建筑耐久性退化的关键因素。提高钢筋氧化皮的耐腐蚀性一直是土木工程材料领域的研究热点。本研究采用溶胶-凝胶法在普通钢筋氧化皮上制备了 ZIF-8 改性 Ce 溶胶-凝胶(ZCS)膜。在 0.1 M NaCl 模拟混凝土孔隙(SCP)溶液中,ZCS 薄膜的 |Z|0.01 Hz 值达到 320 kΩ cm2,是空白钢筋的 29 倍。然后,将它们插入砂浆块中,并在 T = 20 ± 2 °C 和 RH = 95 ± 2% 的养护箱中养护 28 天。随后,在 3.5 wt% 的氯化钠中对这些样品进行电化学阻抗光谱分析。浸泡 20 天后,带有 ZCS 薄膜的螺纹钢的 |Z|0.01 Hz 值是空白螺纹钢的六倍,从而全面提高了螺纹钢的耐腐蚀性。结果表明,ZIF-8 的改性可以降低水泥溶胶凝胶(CS)薄膜的孔隙率,改善薄膜的 "迷宫效应"。此外,在碱性条件下,ZIF-8 表面的负电荷增加了与 Cl- 的斥力效应,大大降低了螺纹钢对 Cl- 的敏感性。
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阿拉丁
Calcium Hydroxide (Ca(OH)2)
阿拉丁
Dimethylimidazole
阿拉丁
Cerium Nitrate Hexahydrate (Ce(NO3)3·6H2O)
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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