Influence of Process Parameters on Surface Roughness and Wettability of Aluminum-Matrix Materials
Super hydrophobic surface has a good application prospect in industry, agriculture and daily life. By controlling the concentration and etching time of hydrochloric acid, different rough structures were prepared on the aluminum-matrix surface, and the relationship of roughness & CA were established to explore the influence of process parameters on the surface roughness and surface wettability. It is found that the concentration and time of hydrochloric acid significantly affect the surface roughness and contact angle (CA). When the concentration of hydrochloric acid is 1.5mol/L and the etching time is 90s, the surface roughness is the best and the maximum CA is obtained. After sodium hydroxide treatment, the hierarchical structure with micro and macro scale was formed, which significantly reduced the contact area between the water droplet and the surface, and the maximum roughness and CA was achieved. The relationship between surface roughness and CA shows that the roughness can amplify the hydrophile/hydrophobicity. Therefore, a better surface of superhydrophobic surface can be obtained by increasing the surface roughness.
Xiao Hong Zhu, Wenlong Cheng and Li Lu
W. X. Du et al., "Influence of Process Parameters on Surface Roughness and Wettability of Aluminum-Matrix Materials", Materials Science Forum, Vol. 932, pp. 8-12, 2018