在纯钛表面制备疏水和抗腐蚀性碳-PTFE复合涂层的性能（英文）

Properties of hydrophobic carbon-PTFE composite coating with high corrosion resistance by facile preparation on pure Ti

采用水热法和浸渍法两步工艺在钛板上制备由碳和聚四氟乙烯(PTFE)组成的复合涂层。采用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FTIR)、水接触角计、X射线光电子能谱(XPS)和电化学技术对复合涂层的形貌、组分、疏水和腐蚀性能进行表征,研究不同聚四氟乙烯浓度的浸渍液对复合涂层腐蚀性能的影响。结果表明,当以0.1 mol/L的葡萄糖溶液为碳源、20 wt.%PTFE悬浮液为浸渍液时,聚四氟乙烯均匀分布于所获得的碳复合涂层表面。20 wt.%PTFE浸制的碳涂层与钛板具有良好的结合强度和疏水性,此时润湿角为142.3°,且涂层耐腐蚀性能良好,腐蚀电流密度低至0.0045μA/cm2。因此,钛基体上制备的碳PTFE复合涂层具有良好的疏水性和耐腐蚀性,在汽车和金属防腐工业中具有较好的应用前景。

Composite coatings consisting of carbon and polytetrafluoroethylene(PTFE) were prepared on Ti alloy substrate by a simple two-step process of hydrothermal and impregnation. The morphology, composition, hydrophobic and corrosion properties of the composite coatings were characterized by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR), water contact angle method, X-ray photoelectron spectroscopy(XPS) and electrochemical technique, respectively. The effect of PTFE content on the corrosion properties of the composite coatings was studied. It is found that the composite coating film exhibits a full coverage with uniformly distributed PTFE when 0.1 mol/L of glucose is used as carbon source and 20 wt.% PTFE suspension as impregnating solution. The coating with 20 wt.% PTFE has a good bonding strength with Ti plate and exhibits excellent hydrophobic property with a water contact angle of 142.3° as well as superior corrosion resistance with corrosion current density as low as 0.0045 μA/cm^2. With regard to its excellent hydrophobicity and corrosion resistance, the carbon-PTFE composite coating may find potential application in automobiles and metal corrosion industries.