Effect of light-burned MgO on the microstructure and electrochemical corrosion behavior of carbonatable protective coatings

IF 8.4 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY Journal of CO2 Utilization Pub Date : 2025-02-24 DOI:10.1016/j.jcou.2025.103047

Zhaohua Xia , Chenxi Liu , Zhichao Liu , Fazhou Wang , Yunpeng Liu , Shuguang Hu

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Abstract

A novel γ-C₂S-MgO-based coatings were developed for steel protection by providing a carbonated layer on the surface of the steel. The effects of light-burned MgO on the coating's microstructure and electrochemical corrosion behavior were analyzed through XRD, FTIR, SEM, and electrochemical tests. The results showed that the incorporation of MgO inhibited the nucleation and growth of calcite, improved the cementation ability of carbonization products, and optimized the pore structure of the coating. Compared to the γ-C₂S group, the addition of MgO provides a two-stage densifying effect: it reacts with water and carbonate dioxide to generate magnesium carbonates at the first stage; then the partial crystalline transformation of magnesium carbonate occurs during the immersion process, provoking coating secondary compaction in the late period. The corrosion current density of the coating without film-forming components soaked in 3.5 wt% NaCl solution for 21 days maintained below 0.001 μA∙cm⁻². The impedance value of the EIS test reaches 10⁶ Ω·cm².

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轻烧MgO对可碳化保护涂层微观结构和电化学腐蚀行为的影响

研究了一种新型的γ- c2s - mgo基涂层，通过在钢的表面提供一层碳化层来保护钢。通过XRD、FTIR、SEM和电化学测试分析轻烧MgO对涂层微观结构和电化学腐蚀行为的影响。结果表明，MgO的掺入抑制了方解石的成核和生长，提高了碳化产物的胶结能力，优化了涂层的孔隙结构。与γ-C2S基团相比，MgO的加入提供了两阶段的致密效应：第一阶段与水和碳酸钙反应生成碳酸镁；然后在浸泡过程中碳酸镁发生部分结晶转变，引起涂层后期二次压实。不含成膜成分的涂层在3.5 wt% NaCl溶液中浸泡21 d后，腐蚀电流密度保持在0.001 μA∙cm−2以下。EIS测试阻抗值达到106 Ω·cm2。

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来源期刊

Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL

CiteScore

13.90

自引率

10.40%

发文量

406

审稿时长

2.8 months

期刊介绍： The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.