Robust biomimetic-structural superhydrophobic surface on aluminum alloy

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Superhydrophobic surfaces mimic natural structures for advanced properties.
• Developing robust superhydrophobic coatings for aluminum alloys is crucial for demanding applications.
• Existing methods often lack the durability required for harsh environments.

Purpose of the Study:

• To develop a facile and robust method for creating biomimetic superhydrophobic surfaces on 2024 Al alloy.
• To investigate the stability and resistance of the superhydrophobic surface under various harsh conditions.
• To explore the potential for extending this fabrication approach to other metals and alloys.

Main Methods:

• Fabrication of ginkgo-leaf-like nanostructures via hydrothermal treatment in a La(NO3)3 solution.
• Surface modification of the nanostructured 2024 Al alloy with dodecafluoroheptyl-propyl-trimethoxylsilane (Actyflon-G502).
• Characterization of surface properties, including water contact angle (WCA), and assessment of stability and resistance to environmental factors.

Main Results:

• Achieved a superhydrophobic surface on 2024 Al alloy with a water contact angle (WCA) up to 160°.
• Demonstrated high stability: WCA remained ~160° after 80 days air storage, 24h at 250°C, and 24h UV exposure.
• Exhibited strong resistance: WCA >144° in acidic/alkaline media, >150° after 48h corrosion, and >150° after abrasion (0.98 kPa, 1000 mm).
• Attributed durability to stable lanthanum (hydr)oxide structures.

Conclusions:

• A facile and effective method for creating robust superhydrophobic surfaces on 2024 Al alloy has been established.
• The developed surface exhibits exceptional stability and resistance to harsh environmental conditions.
• The biomimetic approach shows promise for widespread application on various metals and alloys.