(1. 北京工商大學(xué) 材料與機(jī)械工程學(xué)院，北京 100048；
2. 大連海事大學(xué) 交通運(yùn)輸裝備與海洋工程學(xué)院，大連 116026)
摘 要: 利用微弧氧化技術(shù)在鎂合金表面制備微米級粗糙結(jié)構(gòu)，采用環(huán)氧樹脂溶液和納米二氧化硅分散液對該表面進(jìn)行涂覆處理，再利用全氟硅烷改性，制備得到具有超疏水性的復(fù)合膜層。采用掃描電鏡、X射線衍射儀、接觸角測量儀、高速攝影系統(tǒng)和電化學(xué)工作站評價(jià)膜層的形貌結(jié)構(gòu)、潤濕性和耐蝕性。結(jié)果表明：微弧氧化層所具有的微米級結(jié)構(gòu)和納米二氧化硅顆粒組成的微/納二元粗糙結(jié)構(gòu)對疏水性的提高具有重要作用；復(fù)合膜層表面的接觸角隨二氧化硅分散液濃度的提高呈現(xiàn)先增加后減小的趨勢，并最終逐漸穩(wěn)定在150°左右；當(dāng)二氧化硅分散液溶度為10 g/L時(shí)，復(fù)合表面的接觸角最大可達(dá)161°。同時(shí)該表面對水滴呈現(xiàn)低黏附特性。動(dòng)電位極化曲線表明：與鎂合金基底相比，微弧氧化層和復(fù)合膜層的耐蝕性提高2~3個(gè)數(shù)量級。
關(guān)鍵字: 鎂合金；超疏水；微弧氧化；納米二氧化硅；微/納二元結(jié)構(gòu)；
（1. School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China;
2. Transportation Equipments and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China）
Abstract:Micron scale rough structures on magnesium alloy substrate surface were acquired by micro-arc oxidation technique. Nanoscale rough structures on the surface of micro-arc oxidation coating were prepared by painting epoxy acetone solution and silica suspension subsequently. Superhydrophobic duplex-treated film was fabricated by perfluorodecyltrichlorosilane self-assembled monolayers deposited on micro-nanostructures. Scanning electron microscope, X-ray diffractometer, contact angle measurement, high-speed camera system and electrochemical workstation were used to analyze the surface morphology, wettability and corrosion resistance of films. The results indicate that micro- and nanostructures of micro-arc oxidation and nano-silica play an important role on preparing superhydrophobic surface. The contact angles on duplex-treated film increase initially, and then reduce with increasing the concentration of silica suspension, and finally stabilize at around 150° gradually. The maximum contact angle of 161° is acquired when the concentration of silica suspension is 10 g/L. And the films possess the characteristics of low adhesion. The potentiodynamic polarization curves indicate that, comparing to the bare magnesium alloy, the corrosion resistance of micro-arc oxidation coating and duplex-treated film increases significantly by 2-3 orders of magnitude.
Key words: magnesium alloy; superhydrophobic; micro-arc oxidation; nano-silica; micro-nano binary structure
