October 19, 2017, 11 am CDT
Register at https://www.serdp-estcp.org/Tools-and-Training/Webinar-Series/10-19-2017
“Laser-Interference Surface Preparation for Enhanced Coating Adhesion and Adhesive Joining of Multi-Materials” by Dr. Adrian Sabau
This project supports SERDP’s efforts to reduce Department of Defense’s use of chemical conversion coatings for corrosion protection, which usually employ highly toxic chromate solutions, often hexavalent chrome type-I by developing sustainable, cost-effective technologies. Developing and transitioning new non-chemical processes for surface preparation are sought to drastically reduce the environmental impact, risks and costs in the manufacture and maintenance of DoD weapons systems. The objective of this project is to understand and evaluate the feasibility of using a one-step process at ambient conditions based on laser-interference structuring techniques to replace the chemical conversion coating steps prior to the application of coating systems or adhesive bonding for Al and Ti aircraft components. The presentation will first describe preliminary results for the surface preparation of Al2024-T3 for coating/adhesive bonding using laser-interference processing. The laser-interference power profile, which was used to structure the surfaces, was created by splitting the beam and guiding those beams to the sample surfaces. The results for the single-lap shear tests of an aluminum alloy and carbon fiber polymer composite specimens indicate an increased joint performance over baseline joints. Joints made with laser-structured surfaces were found to absorb approximately 150% more energy than the baseline joints.
“Laser Technology in Aerospace Maintenance” by Mr. Tom Naguy
The U.S. Air Force, with significant support from the Strategic Environmental Research and Development Office (SERDP) and the Environmental Security Technology Certification Program (ESTCP), has been investigating and implementing the use of laser technology in support of maintenance operations for many years, specifically in the areas of depainting and surface preparation of materials. Cost and environmental and occupational health savings in the use of laser technology over chemical or physical methods have been well documented. Laser depaint technology of late has focused on fiber delivered lasers but CO2 laser technology has advances that should not be overlooked and efforts on this technology are underway.
Implementation of Hand Held laser technology is underway across USAF bases in the states as well as overseas. Large off-aircraft components such as aircraft radomes have been successfully laser de-painted for many years and we are looking to expand this capability to other depots. Full aircraft depaint for the F-16 is in the final stages of full production implementation. SERDP and ESTCP are key partners in expanding the use of lasers and investigating new lasers to improve corrosion, fatigue and adhesion performance.