Enhanced anticorrosion waterbased polyurethane coating using Schiff base functionalized MXene

Results in Materials Pub Date : 2025-03-14 DOI:10.1016/j.rinma.2025.100687

Ali Moshkriz , Reza Darvishi , Aboulfazl Barati , Mohsen Tafazoly

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Abstract

In this study, a novel anticorrosive waterborne polyurethane (WPU) coating was developed using Schiff base-functionalized MXene nanosheets. MXene (Ti₃C₂Tx) was first etched with hydrofluoric acid and then intercalated with a Copper (II) Schiff Base Complex Component (CSBCC), linked via (3-Aminopropyl) triethoxysilane (APTES) to enhance dispersion and chemical stability. The modified nanosheets (AMMXene-CSBCC) were incorporated into WPU at various weight fractions (0.3, 0.5, and 0.7 wt%) and applied to mild steel substrates. Characterization techniques, including FTIR, XRD, SEM-EDS, and TGA, confirmed the successful surface functionalization of MXene. Electrochemical Impedance Spectroscopy (EIS) results demonstrated that the optimal 0.5 wt% AMMXene-CSBCC coating (AXPU0.5) significantly improved corrosion resistance, achieving a total impedance of 6.9 × 10⁷ Ω at 0.01 Hz after 48 h of immersion, compared to 7.6 × 10⁵ Ω for pure WPU. Tafel polarization studies further revealed a reduction in corrosion current density to 6.04 × 10⁷ A/cm² for AXPU0.5, marking a 99.2 % inhibition efficiency, a notable enhancement over unmodified MXene-based coatings. The adhesion strength of AXPU0.5 was also improved, reaching 3.19 MPa, demonstrating strong substrate bonding. The Schiff base modification not only enhanced the oxidation resistance of MXene but also facilitated the formation of a more robust passive film, improving long-term protection. The superior anticorrosion performance, environmental benefits (reduced VOC emissions), and enhanced mechanical properties make this approach highly promising for industrial applications in marine, aerospace, and infrastructure sectors.

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希夫碱功能化MXene增强防腐水性聚氨酯涂料

本研究利用席夫碱功能化MXene纳米片制备了一种新型防腐水性聚氨酯（WPU）涂料。MXene （Ti3C2Tx）首先用氢氟酸蚀刻，然后用铜（II）希夫碱配合物（CSBCC）插入，通过（3-氨基丙基）三乙氧基硅烷（APTES）连接，以提高分散性和化学稳定性。将改性的纳米片（AMMXene-CSBCC）以不同重量分数（0.3、0.5和0.7 wt%）掺入WPU中，并应用于低碳钢基体。表征技术，包括FTIR， XRD， SEM-EDS和TGA，证实了MXene的成功表面功能化。电化学阻抗谱（EIS）结果表明，最佳的0.5 wt% AMMXene-CSBCC涂层（AXPU0.5）显著提高了耐蚀性，在0.01 Hz浸泡48 h后，总阻抗为6.9 × 107 Ω，而纯WPU的总阻抗为7.6 × 105 Ω。Tafel极化研究进一步表明，AXPU0.5的腐蚀电流密度降低至6.04 × 107 a /cm2，缓蚀效率为99.2%，比未改性的mxene基涂层有显著提高。AXPU0.5的结合强度也有所提高，达到3.19 MPa，表现出较强的基材结合能力。希夫碱改性不仅增强了MXene的抗氧化性，而且有助于形成更坚固的钝化膜，提高长期保护。优越的防腐性能、环境效益（减少VOC排放）和增强的机械性能使这种方法在船舶、航空航天和基础设施领域的工业应用中非常有前途。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Materials

CiteScore

5.30

自引率

0.00%

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