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Multifunctional Aluminum Pre-treatments from End-Functionalized Phosphonic Acid Self-Assembled Monolayers.
Reuben J Yeo1, Julian N Bleich1,2, Mathilde Guérin2
1Ecole Polytechnique Fédérale de Lausanne (EPFL) Institute of Materials, Lausanne 1015, Switzerland.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 2, 2024
Summary
This study modified aluminum surfaces with self-assembled monolayers (SAMs) to improve lubricant performance. Hydrophilic and nucleophilic SAMs enhanced lubricant wetting, forming, and adhesive bonding, even in corrosive environments.
Area of Science:
- Materials Science
- Surface Chemistry
- Tribology
Background:
- Aluminum alloys are vital in advanced engineering due to their strength, low weight, and corrosion resistance.
- Lubricants are essential for forming aluminum sheets, but residual lubricant hinders subsequent adhesive bonding.
- Developing surface modifications is crucial to reduce lubricant use and improve performance.
Purpose of the Study:
- To modify aluminum surfaces using self-assembled monolayers (SAMs).
- To reduce lubricant requirements during forming processes.
- To enhance friction, forming, and adhesive bonding performance of aluminum.
Main Methods:
- Aluminum surfaces were modified with various self-assembled monolayers (SAMs).
- Surface energy and wetting properties were analyzed.
- Forming performance was evaluated at reduced lubricant coat weights.
- Adhesive bonding tests were conducted under corrosive conditions.
Main Results:
- SAMs with hydrophilic and nucleophilic end groups created stable, high-energy surfaces.
- Improved lubricant wetting was observed on modified surfaces.
- Enhanced forming performance was achieved with reduced lubricant application.
- Nucleophilic SAMs demonstrated superior adhesive bonding in corrosive environments.
Conclusions:
- Self-assembled monolayers effectively modify aluminum surfaces for improved performance.
- Hydrophilic and nucleophilic SAMs offer a pathway to reduce lubricant use in aluminum forming.
- These surface modifications enhance both forming and adhesive bonding, particularly under challenging conditions.
