Effects of acid concentration on the superhydrophobic surface on aluminum alloy by etching and PP-coating

摘要

We investigated the effect of hydrochloric acid concentration for preparing the superhydrophobic surface on aluminum alloy by etching and PP coating. The superhydrophobicity of the surface was characterized by water contact angle. The morphologies of the surface were observed by SEM. The results showed that the acid concentration had an obvious effect on the hydrophobic surface and a good superhydrophobic surface was achieved by PP coating after etching for suitable time. When the acid concentration is lower, the longer time is necessary for obtaining the superhydrophobic surface. When the concentration of hydrochloric acid was 4 g/L and the etching time was only 8 min, the best superhydrophobic surface with the highest contact angle (CA) of 157° was prepared. The obtained superhydrophobic surface resulted from the rough surface and the material of PP with the low surface energy.