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  4. On the Corrosion Properties of Aluminum 2024 Laser‐Textured Surfaces with Superhydrophilic and Superhydrophobic Wettability States
 
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2023
Journal Article
Title

On the Corrosion Properties of Aluminum 2024 Laser‐Textured Surfaces with Superhydrophilic and Superhydrophobic Wettability States

Abstract
In this work, the mechanism of the corrosion behavior of laser-treated aluminum is studied. Two different laser techniques are used to fabricate the samples, direct laser interference patterning (DLIP) and direct laser writing (DLW), using nanosecond laser sources. The DLIP treatment uses a two-beam optical configuration producing line-like periodic structures. The DLW technique is employed to produce non-periodic structures on the Al-surface with the same cumulated fluences as in DLIP. The surface topography is analyzed by confocal microscopy, and the formation of oxide layers is investigated by scanning electron microscopy of cross-sections produced using a focused ion beam. Wetting measurements performed on the laser-treated samples exhibit a contrasting behavior, leading to either superhydrophobic or superhydrophilic states. In the case of the DLIP treatment, the static water contact angle is increased from 81° up to 158°, while for DLW, it decreases to 3°. Electrochemical tests demonstrate a decreased corrosion rate after laser treatment. Additionally, findings indicate no correlation between wettability and corrosion reduction. Therefore, the improvement in corrosion resistance is mainly attributed to the oxide layer formed by laser treatment. Although similar corrosion rates are achieved for both treatments, surfaces produced with DLIP can be beneficial when additional surface properties are required.
Author(s)
Zschach, Lis Geraldine
TU Dresden  
Baumann, Robert
TU Dresden  
Soldera, Flavio
Universität des Saarlandes  
Mendez, Claudia Marcela
Universidad Nacional de Misiones
Apelt, Sabine
TU Dresden  
Bergmann, Ute
TU Dresden  
Lasagni, Andrés-Fabián  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Journal
Advanced materials interfaces  
Open Access
DOI
10.1002/admi.202300607
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Keyword(s)
  • corrosion resistance

  • laser treatment

  • nanosecond pulsed laser

  • superhydrophilicity aluminum 2024

  • superhydrophobicity

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