The protective efficacy of chemically bonded phosphate ceramic coatings (CBPC) is notably diminished owing to the presence of micropores and inadequate self-healing capacity in prolonged corrosive environments. Consequently, it is imperative to augment the corrosion and wear resistance of phosphate ceramic coatings while imbuing them with self-healing capabilities. In this work, a novel self-healing phosphate ceramic coating (MC-PT_x@CBPC, x = 0.5, 1.0, 1.5) is designed by urea-formaldehyde (UF) in situ polymerization of nanoscale microcapsules encapsulated with 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) and evaluated in detail for corrosion and wear resistance. The corrosion inhibition efficiencies of all formulated MC-PT_x@CBPC (x = 0.5, 1.0, 1.5) coatings exceed 90%, with the impedance modulus at the lowest frequency (|Z|_f=0.01) showing enhancements of 1–2 orders of magnitude compared to pure CBPC. Moreover, the self-healing function becomes active during prolonged immersion. This can be primarily ascribed to the formation of a unique micronanostructure facilitated by nanoscale microcapsules and micrometer-sized alumina ceramics, bonded via the AlPO₄ phase. This structure enhances both the hydrophobicity and the bonding strength of the coating. Specifically, following prolonged immersion, the encapsulated PFDTES is liberated from the microcapsules, undergoing hydrolysis and subsequent polymerization upon contact with the electrolyte to form a protective thin film. This film efficiently obstructs the ingress of corrosive agents. Furthermore, the special micronanostructure enhances the hardness of the coating and the releasing PFDTES can form a lubricating film at the interface of abrasion, thus reducing the wear rate and friction coefficient of the MC-PT_x@CBPC (x = 0.5, 1.0, 1.5). Therefore, MC-PT_x@CBPC (x = 0.5, 1.0, 1.5) possesses excellent corrosion protection, tribological properties, and self-healing capabilities, which provide thought-provoking ideas for phosphate ceramic coatings to protect metals in harsh environments.

中文翻译：

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原位聚合自修复微胶囊作为磷酸盐陶瓷涂层的多功能填料


由于微孔的存在和长期腐蚀环境中自愈能力不足，化学键合磷酸盐陶瓷涂层（CBPC）的防护功效显着降低。因此，必须增强磷酸盐陶瓷涂层的耐腐蚀性和耐磨性，同时赋予其自修复能力。在这项工作中，通过尿素甲醛（UF）原位聚合封装纳米级微胶囊，设计了一种新型自修复磷酸盐陶瓷涂层（MC-PT _x @CBPC，x = 0.5, 1.0, 1.5）。使用 1H,1H,2H,2H-全氟癸基三乙氧基硅烷 (PFDTES) 进行测试，并详细评估其耐腐蚀性和耐磨性。所有配制的MC-PT _x @CBPC (x = 0.5, 1.0, 1.5)涂层的缓蚀效率超过90%，阻抗模量在最低频率(|Z| _f=0.01 相结合的纳米级微胶囊和微米级氧化铝陶瓷促进了独特的微纳米结构的形成。这种结构增强了涂层的疏水性和结合强度。具体来说，长时间浸泡后，封装的 PFDTES 从微胶囊中释放出来，在与电解质接触时发生水解和随后的聚合，形成保护性薄膜。该薄膜可有效阻止腐蚀剂的进入。 此外，特殊的微纳米结构增强了涂层的硬度，释放的PFDTES可以在磨损界面形成润滑膜，从而降低MC-PT _x @CBPC的磨损率和摩擦系数（x = 0.5, 1.0, 1.5)。因此，MC-PT _x @CBPC(x=0.5、1.0、1.5)具有优异的腐蚀防护、摩擦学性能和自修复能力，为磷酸盐陶瓷涂层保护金属提供了发人深省的思路在恶劣的环境中。