Significant slowdown of plasma-optimized surface energy deactivation by vacuum sealing for efficient adhesive bonding

Yongsoon Shin, Yao Qiao, Nathan Canfield, Zeyang Yu, Harry M. Meyer, Daniel R. Merkel, Ethan K. Nickerson, Nihal S. Kanbargi, Angel Ortiz, Amit K. Naskar, Kevin L. Simmons

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

This work proposes an approach to minimize surface energy deactivation of plasma-treated metal and carbon fiber-reinforced polymer (CFRP) surfaces by vacuum sealing. Plasma treatments enhance adhesive wettability on post-treated surfaces for adhesive joints, but the treated surfaces deactivate quickly in air. The surface energy of aluminum alloy AA6061 and carbon fiber-reinforced polymer-polyamide (CFRP-PA66) optimally treated by a blown air plasma instrument returns to the original surface energy within 1 h. Vacuum sealing of AA6061 and CFRP-PA66 reduced the surface energy deactivation over 7 days by at least 230 times and 970 times compared to in air. Double Cantilever Beam (DCB) tests performed on adhesively-bonded AA6061/CFRP-PA66 joints showed that the total energy release and energy dissipation before failure of plasma-treated and vacuum-sealed materials was up to 60% more than plasma-treated materials without vacuum sealing and up to 125% more than non-plasma-treated materials.

Original languageEnglish
Article number110001
JournalComposites Part B: Engineering
Volume240
DOIs
StatePublished - Jul 1 2022

Funding

This work is supported by US Department of Energy , Office of Energy Efficiency and Renewable Energy , Vehicle Technologies Office . PNNL is operated by Battelle Memorial Institute for the U.S. DOE under contract DE-AC 06-76RLO 1830. Oak Ridge National Laboratory is managed by UT Battelle, LLC, for the U.S. Department of Energy, under contract number DE-AC05-00OR22725. Authors would also like to thank L&L products for providing their adhesives for this project. This work is supported by US Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office. PNNL is operated by Battelle Memorial Institute for the U.S. DOE under contract DE-AC 06-76RLO 1830. Oak Ridge National Laboratory is managed by UT Battelle, LLC, for the U.S. Department of Energy, under contract number DE-AC05-00OR22725. Authors would also like to thank L&L products for providing their adhesives for this project.

Keywords

  • Joint/joining
  • Polymer-matrix composites (PMCs)
  • Surface analysis
  • Surface energy
  • Surface treatments

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