Coating adhesion of a chromate-containing epoxy primer on Al2024-T3 surface processed by laser-interference

Sabau, Adrian; Jun, Jiheon; Mcclurg, Dana

doi:10.1016/j.ijadhadh.2020.102641

Coating adhesion of a chromate-containing epoxy primer on Al2024-T3 surface processed by laser-interference

Journal Article · Tue May 19 00:00:00 EDT 2020 · International Journal of Adhesion and Adhesives

DOI:https://doi.org/10.1016/j.ijadhadh.2020.102641· OSTI ID:1649511

^[1]; ^[1]; Mcclurg, Dana ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this work, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1649511

Alternate ID(s):: OSTI ID: 1631192

Journal Information:: International Journal of Adhesion and Adhesives, Journal Name: International Journal of Adhesion and Adhesives Journal Issue: N/A Vol. 102; ISSN 0143-7496

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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