铝合金表面超疏水涂层的火焰喷雾热解法制备及其耐蚀性能

Flame spray pyrolysis fabricating superhydrophobic coatings on aluminum alloy with its anti-collision property

采用火焰喷雾热解与表面修饰相结合的方法在铝合金表面制备了具有一定耐蚀性能的超疏水表面。以六甲基二硅氧烷溶液为前驱液,通过火焰喷雾热解方法,首先在铝合金表面沉积SiO2纳米颗粒构建粗糙结构,再以氟硅烷溶液进行表面修饰,获得了具有154.9°静态接触角,滚动角<2°的超疏水表面。通过电化学测试,对比了构筑超疏水表面前后的铝合金样品的耐蚀性能。结果表明沉积层与低表面能物质协同作用,通过对腐蚀性离子的有效隔离,提高了铝合金基体的耐蚀性能。

Superhydrophobic coatings were fabricated on aluminum alloy substrate via a method combining flame spray pyrolysis （FSP） and surface modification. The FSP method was utilized to form a multi-scale roughness surface by depositing SiO2 nanoparticles directly on to aluminum alloy suhstrates. Hexamethyldisiloxane （HMDSO） was used as the SiO2 precursor. The surface structure was altered by adjusting the deposition parameters. The coating after fluoration showed superhydrophobicity with a static contact angle up to 154.9° and a tilt angle smaller than 2°. The superhydrophobic coatings were characterized by SEM and AFM to identify the surface morphology and roughness. The results of electrochemical measurements （electrochemical impedance spectroscopy and polarization curve） showed that anti-corrosion property of aluminum alloy was obviously improved.