AZ31镁合金表面水滑石/硅烷涂层的制备及耐蚀性研究
首发时间:2016-11-09
摘要:利用共沉淀及水热法在AZ31镁合金基体上制备了水滑石(LDH)薄膜,然后利用浸泡法在LDH表面制备硅烷膜,从而在镁合金基体表面获得硅烷改性的复合涂层。通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱技术、傅立叶红外光谱仪等手段检测涂层表面的微观形貌、结构和成分;通过光学接触角测试仪表征涂层的疏水性能;通过电化学测试等手段表征样品的耐蚀性能。结果发现,硅烷填充到水滑石涂层的缝隙中且成功地涂覆在水滑石表面;硅烷改性的水滑石涂层达到疏水效果,能够有效阻挡腐蚀介质入侵合金基体,从而有效地提高了涂层的耐蚀性能。?????
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Fabrication of Layered Double Hydroxide/Silane coatings on magnesium alloy AZ31 and its corrosion resistance
Abstract: LDH coating was fabricated by a combined co-precipitation method and hydrothermal process on an AZ31 magnesium alloy. Subsequently, LDH coating was modified with silane by soaking method. The morphologies, microstructures and chemical compositions of the coatings were characterized by Scanning electron microscopy, X-ray diffractometer, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The hydrophobic properties were assessed by the water contact angle meter. The corrosion resistance of the samples was characterized by potentiodynamic polarization, electrochemical impedance spectrum. The results demonstrated that the silane species can penetrate into the LDH coating and were sealed on the surface of the LDH coating. The silane-modified LDH coating has good hydrophobic property and can block the diffusion of the corrosive medium to the magnesium alloy substrate, which can effectively improve the corrosion resistance.
Keywords: materials interface and surface magnesium alloy layered double hydroxide silane modification corrosion resistance
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AZ31镁合金表面水滑石/硅烷涂层的制备及耐蚀性研究
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