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Protective Coatings for Aluminum Alloy Based on Hyperbranched 1,4-Polytriazoles
Elaine Armelin1,2, Rory Whelan3, Yeimy Mabel Martínez-Triana3
1Departament d'Enginyeria Química, EEBE, Universitat Politècnica de Catalunya , C/Eduard Maristany, 10-14, Ed. I2, 08019 Barcelona, Spain.
ACS Applied Materials & Interfaces
|January 10, 2017
Summary
New anticorrosion coatings for aluminum alloys were developed using poly(1,4-disubstituted 1,2,3-triazoles). Low-valency monomers created superior barriers, preventing electrolyte transfer and enhancing corrosion resistance.
Area of Science:
- Materials Science
- Corrosion Science
- Polymer Chemistry
Background:
- Organic polymers are crucial for metal coatings and adhesives.
- Aluminum's rapid oxidative passivation presents challenges for substrate adhesion.
- Poly(1,4-disubstituted 1,2,3-triazoles) exhibit strong bonding with metal substrates.
Purpose of the Study:
- To explore alkyne and azide monomers as precursors for anticorrosion coatings on aluminum-copper alloys.
- To investigate the effectiveness of poly(1,4-disubstituted 1,2,3-triazoles) in preventing aluminum corrosion.
- To identify monomer characteristics that yield superior barrier properties.
Main Methods:
- Synthesis of poly(1,4-disubstituted 1,2,3-triazoles) via copper-catalyzed azide-alkyne cycloaddition.
- Evaluation of low-valency monomers (diazide, trialkyne) as coating precursors.
- Characterization of film properties using Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC).
- Assessment of adhesion through pull-off testing.
- Determination of impermeability via electrochemical impedance spectroscopy (EIS).
Main Results:
- Low-valency monomers (diazide and trialkyne) demonstrated superior performance as electrolyte barriers.
- The developed coatings exhibited excellent resistance to corrosive pitting.
- Highly cross-linked films were formed, indicating good structural integrity.
- Strong adhesion to the aluminum alloy substrate was confirmed.
- Exceptional impermeability to electrolytes was achieved.
Conclusions:
- Poly(1,4-disubstituted 1,2,3-triazoles) derived from low-valency monomers offer effective anticorrosion protection for aluminum alloys.
- The combination of cross-linking, adhesion, and impermeability is key to superior performance.
- These triazole-based coatings represent a promising advancement in materials for aluminum surface protection.
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