A Facile Method to Prepare a Superhydrophobic Magnesium Alloy Surface

Area of Science:

• Materials Science
• Surface Engineering
• Corrosion Science

Background:

• Superhydrophobic materials offer unique properties but face challenges in preparation complexity and environmental impact.
• Magnesium alloys, like AZ91D, are valuable in manufacturing due to their low density and castability.
• Existing methods for superhydrophobic surfaces often involve intricate processes and are not environmentally benign.

Purpose of the Study:

• To develop a facile and environmentally friendly method for creating superhydrophobic surfaces on AZ91D magnesium alloy.
• To investigate the microstructural, wettability, corrosion resistance, and thermal stability properties of the prepared superhydrophobic surface.
• To assess the potential applications of this novel superhydrophobic surface.

Main Methods:

• High-temperature heating was employed to create a coral-like microstructure on the AZ91D magnesium alloy surface.
• Contact angle and rolling angle measurements were used to characterize surface wettability.
• Electrochemical corrosion tests were performed to evaluate corrosion resistance.
• Thermal stability was assessed by measuring contact angles at elevated temperatures.

Main Results:

• A superhydrophobic surface with a contact angle of 159.1° and a rolling angle of 4.8° was successfully prepared.
• The superhydrophobic surface exhibited significantly enhanced corrosion resistance, with the corrosion current reduced by two orders of magnitude and an inhibition efficiency of 96.94%.
• The surface demonstrated excellent thermal stability, maintaining a contact angle above 150° even at 190 °C.

Conclusions:

• The high-temperature heating method provides an efficient, environmentally friendly, and cost-effective route to superhydrophobic AZ91D magnesium alloy surfaces.
• The resulting superhydrophobic surface possesses superior corrosion resistance and thermal stability, alongside self-cleaning properties.
• This approach holds significant promise for broadening the application of superhydrophobic materials, particularly for magnesium alloys in demanding environments.