School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, People's Republic of China.
ACS Appl Mater Interfaces. 2013 Apr 24;5(8):3101-7. doi: 10.1021/am4000134. Epub 2013 Apr 3.
After hydrothermally treated in H2O (for Mg alloy and Al alloy) or H2O2 (for Ti alloy), microstructured oxide or hydroxide layers were formed on light alloy substrates, which further served as the active layers to boost the self-assembling of 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) and finally endowed the substrates with unique wettability, that is, superhydrophobicity. For convenience, the so-fabricated superhyrdophobic surfaces (SHS) were abridged as HT-SHS. For comparison, SHS coded as CE-SHS were also prepared based on chemical etching in acid and succedent surface passivation with PFOTES. To reveal the corrosion protection of these SHS, potentiodynamic polarization measurements in NaCl solution (3.5 wt %) were performed. Moreover, to reflect the long-term stability of these SHS, SHS samples were immersed into NaCl solution and the surface wettability was monitored. Experimental results indicated that HT-SHS was much more stable and effective in corrosion protection as compared with CE-SHS. The enhancement was most likely due to the hydrothermally generated oxide layer by the following tow aspects: on one hand, oxide layer itself can lower the corrosion due to its barrier effect; on the other hand, stronger interfacial bonding is expected between oxide layer and PFOTES molecules.
经水热（用于镁合金和铝合金）或过氧化氢处理（用于钛合金）后，轻合金基底上形成了微结构化的氧化物或氢氧化物层，这些层进一步作为活性层促进 1H,1H,2H,2H-全氟辛基三乙氧基硅烷（PFOTES）的自组装，最终使基底具有独特的润湿性，即超疏水性。为方便起见，所制备的超疏水面（SHS）简写为 HT-SHS。为了进行比较，还基于酸化学蚀刻和随后用 PFOTES 进行表面钝化，制备了简写为 CE-SHS 的 SHS。为了揭示这些 SHS 的腐蚀防护性能，在 3.5wt%NaCl 溶液中进行了动电位极化测量。此外，为了反映这些 SHS 的长期稳定性，将 SHS 样品浸入 NaCl 溶液中并监测表面润湿性。实验结果表明，HT-SHS 在腐蚀防护方面比 CE-SHS 更加稳定和有效。这种增强可能归因于以下两个方面的水热生成氧化物层：一方面，氧化物层本身可以通过其阻挡效应降低腐蚀；另一方面，氧化物层和 PFOTES 分子之间预计会有更强的界面结合。
