Abstract
In this study, the coating adhesion test results are presented for a primer that was coated on laser-interference structured surfaces of as-received Al2024-T3 specimens, i.e., without employing any polishing, cleaning, or any other surface alteration techniques. All of the laser-interference processing was performed by splitting the primary beam of a Q-switched Nd:YAG pulsed nanosecond laser into two beams and focused them to the same spot. The specimens were spray painted with a chromate-containing epoxy primer, CA7233, compliant to MIL-PRF-23377 Type I Class C2 specification. The adhesion of primer on Al surface with different treatments was assessed using the ASTM D3359 X-cut and cross-hatch tests. It was found that the laser processed specimens meet the performance requirements in the coating adhesion specifications by having a higher or identical ranking for coating adhesion specimens than those prepared with current state-of-the-art chemical conversion or sulfuric acid anodizing. The rastering with either 4 mm/s or 6 mm/s with a laser fluence of 1.78 J/cm2 is recommended to attain acceptable coating adhesion, even higher than that with the anodizing surface treatment. These results indicate that laser-interference shows significant potential as a non-chemical surface preparation technique for these coatings.
Original language | English |
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Article number | 102641 |
Journal | International Journal of Adhesion and Adhesives |
Volume | 102 |
DOIs | |
State | Published - Oct 2020 |
Funding
This research was sponsored by Strategic Environmental Research and Development Program ( SERDP ), 4800 Mark Center Drive, Suite 17D03, Alexandria, VA 22350-3605, managed by U.S. Department of Defense, U.S. Department of Energy, and U.S. Environmental Protection Agency. This research was conducted at UT-Battelle, LLC, for the SERDP project WP-2743 “Laser-Interference Surface Preparation for Enhanced Coating Adhesion and Adhesive Joining of Multi-Materials.” The authors acknowledge the technical support from Tom Naguy, Deputy Technical Director, Air Force Materiel Command, W–P AFB; Michael Casey Jones, Materials Engineer, W–P AFB; Rick Osterman and Stan Bean of M&P Solutions LLC, Pahrump, NV. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).This research was sponsored by Strategic Environmental Research and Development Program (SERDP), 4800 Mark Center Drive, Suite 17D03, Alexandria, VA 22350-3605, managed by U.S. Department of Defense, U.S. Department of Energy, and U.S. Environmental Protection Agency. This research was conducted at UT-Battelle, LLC, for the SERDP project WP-2743 ?Laser-Interference Surface Preparation for Enhanced Coating Adhesion and Adhesive Joining of Multi-Materials.? The authors acknowledge the technical support from Tom Naguy, Deputy Technical Director, Air Force Materiel Command, W?P AFB; Michael Casey Jones, Materials Engineer, W?P AFB; Rick Osterman and Stan Bean of M&P Solutions LLC, Pahrump, NV.
Keywords
- Adhesion by mechanical interlocking (D)
- Aluminium and alloys (B)
- Laser
- Primers and coupling agents (A)