Anti-corrosion superhydrophobic surfaces of Al alloy based on micro-protrusion array structure fabricated by laser direct writing

•Superhydrophobic 5083 Al alloy surface with micro-protrusion array structure is fabricated by laser vertical crossed scanning.•Laser scanning times have significant effect on surface adhesion.•A low-surface-energy network covering the surface is formed through hydrolysis and condensation.•Polarizat...

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Bibliographic Details
Published in:	Journal of alloys and compounds 2021-11, Vol.881, p.160649, Article 160649
Main Authors:	Xin, Guoqiang, Wu, Congyi, Liu, Weinan, Rong, Youmin, Huang, Yu
Format:	Article
Language:	eng
Subjects:	Al alloy Alloys Aluminum base alloys Anti-corrosion Corrosion currents Corrosion prevention Corrosion resistance Corrosion resistant alloys Direct laser writing Hydrophobic surfaces Hydrophobicity Impedance Laser Laser ablation Laser arrays Lasers Micro-protrusion array Nanoparticles Scanning Solidification Sputtering Superhydrophobic Surface energy
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Summary:	•Superhydrophobic 5083 Al alloy surface with micro-protrusion array structure is fabricated by laser vertical crossed scanning.•Laser scanning times have significant effect on surface adhesion.•A low-surface-energy network covering the surface is formed through hydrolysis and condensation.•Polarization and impedance experiments indicate superhydrophobic surface is effective to enhance the corrosion resistance. [Display omitted] Enhanced corrosion resistance of widely used Al alloys is of great significance to improving its application value. The micro-protrusion array structure covered with nanoparticles was fabricated on the surface of 5083 Al alloy by nanosecond laser vertical crossed scanning. Formation mechanism of the micro-nano structure was attributed to the heat accumulation of the laser pulse acting on the surface, including melting, sputtering and re-solidification. After laser treatment and reduction of surface energy, samples with different scanning times were all superhydrophobic. However, the adhesion of the surfaces with scanning times of 10 and 1 was different, which were shown as ‘lotus leaf effect’ and ‘rose petal effect’, respectively. It was found that the sputtering material during laser ablation oxidized most severely, and the ratio of O increased by 23.65%. The long chains of FAS-17 molecules have been attached on the superhydrophobic surface after modification. The polarization tests showed that the superhydrophobic surface can significantly reduce the corrosion current density, and the inhibition efficiency is 95.7%. Impedance tests verified the anti-corrosion ability of the superhydrophobic surface with the largest impedance of 26.01 kΩ cm2. This study provides an effective and simple preparation method for enhancing the corrosion resistance of aluminum alloy.
ISSN:	0925-8388 1873-4669