Abstract: Great attention has been focused on super-hydrophobic surfaces due to their fantastic applications. Fluoride chemicals are widely used to fabricate super-hydrophobic surfaces due to their convenience, simplicity, and high efciency. Previous research has made extensively eforts on corrosion resistance of fuorinated super-hydrophobic surfaces in corrosive media. Nevertheless, rare papers focused on the underlying reasons of anticorrosion property and stability mechanism on the fuorinated super-hydrophobic coatings in alkaline solution. Therefore, this work aims to reveal these mechanisms of fuorinated super-hydrophobic copper samples in strong alkaline solution (pH 13). Through the characterization of surface wettability and surface morphology, the laser-induced super-hydrophobic surface retained excellent stability after soaking in alkaline solution for 4 h. Through measurement of chemical compositions, the anticorrosion mechanism and stability mechanism of the fuorinated super-hydrophobic surface were proposed. Importantly, the hydroxyl ion (OH?) can further promote the hydrolysis reaction to improve the density and bonding strength of the fuoride molecules. Finally, the electrochemical experiments (PDP and EIS tests) were conducted to validate the rationality of our proposed conclusions.

Key words: Fluoride, Laser, Super-hydrophobicity, Alkaline corrosion, Stability mechanism