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Improvement of Polymer/Metal Adhesion Using Anodizing Treatment and 3D Printing Process.
Seung Wan Ryu1, Dong Hyun Kim2, Wonhwa Lee2
1Hydrogen&C1 Gas Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea.
Polymers
|February 13, 2025
Summary
This study developed a novel aluminum anodizing method using phosphoric acid and hydrogen peroxide. This process significantly enhances polymer resin bonding strength for lightweight composite applications.
Area of Science:
- Materials Science
- Surface Engineering
- Composite Materials
Background:
- Joining dissimilar materials is challenging.
- Traditional methods often involve environmentally harmful chemicals like Cr(VI).
- Need for advanced surface treatments to improve material adhesion.
Purpose of the Study:
- Investigate a one-step anodization of aluminum using phosphoric acid and hydrogen peroxide.
- Enhance the bonding strength between aluminum and polymer resins.
- Explore eco-friendly alternatives for material joining.
Main Methods:
- One-step anodization of aluminum in a mixed phosphoric acid and hydrogen peroxide solution.
- Controlled electrical current and varying phosphoric acid concentrations.
- Direct injection molding and 3D printing of polymer resins onto anodized aluminum.
Main Results:
- Anodization created a 3D channeling pore structure with uniform nanopores.
- Hydrogen peroxide increased nanopore size, improving polymer resin penetration.
- Achieved bonding strengths up to 40.34 MPa, significantly higher than conventional methods.
- 3D printing demonstrated superior bonding compared to injection molding.
Conclusions:
- The developed anodizing process effectively enhances aluminum-polymer bonding.
- Increased nanopore size is critical for improved mechanical interlocking.
- This method offers an environmentally friendly approach for creating lightweight composites.
