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采用化学刻蚀与低表面能修饰的方法在Q235钢基体上制得超疏水表面。通过扫描电镜(SEM)、激光共聚焦显微镜(CLSM)、接触角测量仪研究了刻蚀液组成对金属表面粗糙度以及润湿性的影响。利用电化学工作站对其表面防腐性能进行了测试。结果表明:通过化学刻蚀和低表面能物质修饰相结合的方法成功地制备了超疏水表面;刻蚀液中硝酸的浓度对金属表面粗糙度起主要作用,随着刻蚀液中硝酸浓度的增加,粗糙度呈现先增大后减小的趋势。通过在粗糙结构表面构筑低表面能涂层可以获得超疏水表面,经浓度为20%(质量分数)硝酸刻蚀液刻蚀的表面涂覆二甲基硅氧烷(PDMS)后,疏水性最佳,接触角为163°。电化学数据表明,超疏水金属表面具有较好的防腐性能,这主要是由超疏水表面的空气层、PDMS层和疏水金属表面三者的协同作用形成的腐蚀抑制作用。
Superhydrophobic surfaces were fabricated on Q235 steel substrates by chemical etching and low surface energy modification. The effects of composition of etching solution on the roughness and wettability of metal surface were investigated by scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and contact angle measurement. Its surface corrosion resistance was tested by electrochemical workstation. The results showed that the superhydrophobic surface was successfully prepared by the combination of chemical etching and low surface energy material modification. The concentration of nitric acid in the etching solution played a major role in the roughness of the metal surface. With the concentration of nitric acid in the etching solution Increase, the roughness increases first and then decreases. The superhydrophobic surface can be obtained by constructing a low surface energy coating on the surface of rough structure. After the surface-coated dimethylsiloxane (PDMS) etched by 20% (mass fraction) nitric acid etching solution, the hydrophobicity is the most Good, contact angle of 163 °. Electrochemical data show that the superhydrophobic metal surface has good corrosion resistance, which is mainly caused by the synergistic effect of the air layer, the PDMS layer and the hydrophobic metal surface on the superhydrophobic surface.