铝合金超双疏表面的制备及其耐蚀性研究

Preparation of Superamphiphobic Surface on Al-alloy and Its Corrosion Resistance

采用盐溶液刻蚀和水浴处理的方法,结合氟硅烷的表面修饰,在5083铝合金基体上制备出了超双疏表面。采用场发射扫描电子显微镜(FE-SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、接触角测量和电化学测试等方法研究了超双疏铝合金表面的微观形貌、化学成分、疏水疏油性和耐蚀性。结果表明,水和乙二醇在该表面上的接触角分别为158°和154.3°,展现出良好的超双疏性能;与基体相比,超双疏试样的腐蚀电位明显正移,腐蚀电流密度由4.016×10^(-6) A·cm^(-2)下降至1.531×10^(-7) A·cm^(-2);在3.5%(质量分数)NaCl溶液中浸泡5 d后,超双疏试样的电荷转移电阻仍明显高于基体,提高了5083铝合金基体的耐蚀性。

Superamphiphobic surface film was prepared on 5083 Al-alloy substrate by using chemical etching and then finishing in an ethanol solution of perfluorodecyl triethoxysilane.Its microscopic morphology,chemical composition,superamphiphobicity and corrosion resistance were characterized by means of field emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),contact angle measurements and electrochemical tests.The results showed that the contact angles of water and ethylene glycol on the surface were 158°and 154.3°,respectively,exhibiting good superamphiphobicity.In comparison with the bare alloy,the free corrosion potential of the 5083 Al-alloy with superamphiphobic surface film exhibited significantly positive shift,while the corrosion current decreased from 4.016×10^(-6) A·cm^(-2) to 1.531×10^(-7) A·cm^(-2);after immersing in 3.5%(mass fraction)NaCl solution for 5 d,the charge transfer resistance of the alloy with superamphiphobic surface film was still significantly higher than that of the bare alloy,it follows that the superamphiphobic surface finishing can enhance the corrosion resistance of 5083 Al-alloy substrate.