Zhang Yukun, Chen Chong, Chen Zhengfei, Zhang Tongtong, Wang Yunlong, Cao Shuiyan, Ma Jun
Department of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, P. R. China.
School of Biological and Chemical Engineering, NingboTech University, Ningbo, Zhejiang 315100, P. R. China.
ACS Appl Mater Interfaces. 2023 Mar 1;15(8):11099-11110. doi: 10.1021/acsami.2c22184. Epub 2023 Feb 16.
MXene-reinforced composite coatings have recently shown promise for metal anticorrosion due to their large aspect ratio and antipermeability; however, the challenges of the poor dispersion, oxidation, and sedimentation of MXene nanofillers in a resin matrix that are often encountered in the existing curing methods have greatly limited practical applications. Herein, we reported an efficient, ambient, and solvent-free electron beam (EB) curing technology to fabricate PDMS@MXene filled acrylate-polyurethane (APU) coatings for anticorrosion of 2024 Al alloy, a common aerospace structural material. We showed that the dispersion of MXene nanoflakes modified by PDMS-OH was dramatically improved in EB-cured resin and enhanced the water resistance through the additional water-repellent groups of PDMS-OH. Moreover, the controllable irradiation-induced polymerization enabled a unique high-density cross-linked network, presenting a large physical barrier against corrosive media. The newly developed APU-PDMS@MX coatings achieved excellent corrosion-resistance with the highest protection efficiency of 99.9957%. The coating filled with uniformly distributed PDMS@MXene promoted the corrosion potential, corrosion current density, and corrosion rate to be -0.14 V, 1.49 × 10 A/cm, and 0.0004 mm/year, respectively, and the impedance modulus was increased by 1-2 orders of magnitude compared to that of APU-PDMS coating. This work combining 2D material with EB curing technology broadens the avenue for designing and fabricating composite coatings for metal corrosion protection.
MXene增强复合涂层由于其大的长径比和抗渗透性，最近在金属防腐方面显示出了应用前景；然而，现有固化方法中经常遇到的MXene纳米填料在树脂基体中分散性差、易氧化和沉降等问题，极大地限制了其实际应用。在此，我们报道了一种高效、常温且无溶剂的电子束（EB）固化技术，用于制备用于2024铝合金（一种常见的航空航天结构材料）防腐的PDMS@MXene填充丙烯酸酯 - 聚氨酯（APU）涂层。我们表明，经PDMS - OH改性的MXene纳米片在EB固化树脂中的分散性得到了显著改善，并且通过PDMS - OH额外的疏水基团提高了耐水性。此外，可控的辐射诱导聚合形成了独特的高密度交联网络，对腐蚀性介质形成了巨大的物理屏障。新开发的APU - PDMS@MX涂层具有优异的耐腐蚀性，最高保护效率达到99.9957%。填充有均匀分布的PDMS@MXene的涂层使腐蚀电位、腐蚀电流密度和腐蚀速率分别提高到 - 0.14 V、1.49×10 A/cm和0.0004 mm/年，与APU - PDMS涂层相比，阻抗模量提高了1 - 2个数量级。这项将二维材料与EB固化技术相结合的工作拓宽了设计和制造用于金属腐蚀防护的复合涂层的途径。
