In this study, the polytetrafluoroethylene (PTFE) composite ceramic coatings with hybrid aluminum dihydrogen phosphate (AP) are prepared on AISI 304L stainless steel by spraying and heat curing to improve the corrosion resistance of the coatings. AP is hybridized with methyltriethoxysilane (MTES), and the structure of the hybrid AP is characterized by Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. Contact angle tests, scratch tests, and electrochemical experiments are used to investigate the corrosion behavior of composite ceramic coatings. In addition, scanning electron microscopy is used to examine the microscopic morphology of the coatings after corrosion to investigate the mechanism of the hybrid AP on the corrosion resistance of the composite ceramic coatings. The findings reveal that MTES successfully hybridizes with AP and implants the –CH₃ hydrophobic group in AP, which improves the hydrophobicity of composite coatings. The corrosion potential of hybrid AP coatings all move in a positive direction, and the corrosion current density is lower than that of unhybridized AP coatings. The corrosion current density of the coating is about 2.931e−008 A/cm² when the MTES content is 5 wt%, which is 20% less than that of the unhybridized AP coating. Results indicate hybrid AP can significantly improve the corrosion resistance of PTFE composite ceramic coatings with the best corrosion resistance occurring when the content of MTES is 5 wt%.

中文翻译：

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杂化磷酸二氢铝对聚四氟乙烯复合陶瓷涂层耐腐蚀性能的影响

在这项研究中，通过喷涂和热固化在 AISI 304L 不锈钢上制备了混合磷酸二氢铝 (AP) 的聚四氟乙烯 (PTFE) 复合陶瓷涂层，以提高涂层的耐腐蚀性能。AP与甲基三乙氧基硅烷（MTES）杂化，杂化AP的结构通过傅里叶变换红外光谱和X射线光电子能谱表征。接触角测试、划痕测试和电化学实验用于研究复合陶瓷涂层的腐蚀行为。此外，通过扫描电子显微镜检查腐蚀后涂层的微观形貌，以研究杂化 AP 对复合陶瓷涂层耐腐蚀性能的作用机制。₃ AP中的疏水基团，提高了复合涂层的疏水性。杂化AP涂层的腐蚀电位均向正方向移动，腐蚀电流密度低于未杂化AP涂层。当MTES含量为5wt%时，涂层的腐蚀电流密度约为2.931e-008 A/cm ²，比未杂交的AP涂层小20%。结果表明，混合AP可以显着提高PTFE复合陶瓷涂层的耐腐蚀性能，当MTES的含量为5 wt%时，耐腐蚀性能最好。