Superhydrophobic surface of aluminum alloy prepared by anodic oxidation and its corrosion resistance

doi:10.13251/j.issn.0254-6051.2021.09.043

Abstract

Abstract: Surface morphology, chemical composition and corrosion resistance of the anodized and low surface energy materials modified 7075 aluminum alloy were characterized by contact angle measurement instrument, scanning electron microscopy, infrared spectroscopy, and electrochemical workstation. The results show that the synergistic effect of coral like micro-nano structure constructed by anodic oxidation and low surface energy oxalic acid endows 7075 aluminum alloy with superhydrophobic property. When the concentration of oxalic acid is 40 g/L, the current density is 20 A/dm², and the anodizing time is 10 min, superhydrophobic aluminum alloy surface shows the largest contact angle of 152°, and the outstanding corrosion resistance, which is 4 orders of magnitude lower than that of the aluminum alloy matrix, and the excellent antifouling as well as self-cleaning properties.

Key words: aluminum alloy, anodizing, superhydrophobic, corrosion resistance

CLC Number:

TG174.4

Zhuang Mingta, Xu Ruisi, Liu Cansen, Jie Xiaohua. Superhydrophobic surface of aluminum alloy prepared by anodic oxidation and its corrosion resistance[J]. Heat Treatment of Metals, 2021, 46(9): 241-246.

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