Retrogression and Re-aging (RRA)
of 7075-T6 Corrosion Prone Parts

Period of Performance:  December 2000 - December 2004

Principal Investigator: Dr. Peter Sjoblom
University of Dayton Research Institute
300 College Park
Dayton, OH 45469
Phone: 937-229-4704
Email: Dr. Peter Sjoblom

Under the Contractual Engineering Task, "Retrogression and Re-Aging (RRA) of 7057-T6 Corrosion Prone Parts", UDRI will transition previously developed laboratory RRA procedures into a robust Shop-level process to improve the corrosion resistance of 7075-T6 aircraft parts or components.  Using conventional and readily available heat-treating equipment, procedures for the Shop RRA process ill be developed and validated, and the process documented in a user-friendly process manual to allow for RRA treatment by an Air Force, or independent, facility.  To allow for maximum utility, the developed Shop RRA procedures will be sufficiently generic to enable RRA-treatment of all types of aircraft parts.  UDRI will demonstrate the process by treating aircraft parts at an Air Force facility or approved supplier, and will transition the process to the Air Force.  To enable treatment of parts that are still installed, or partially installed, on an aircraft, UDRI will develop an in-situ RRA process.  Utilizing portable equipment, in-situ RRA process procedures will be developed, validated, and documented in a user's manual.  The prototype in-situ RRA equipment will be delivered to a selected Air Force facility, and validation testing will be done by in-situ treating aircraft components without full disassembly.  At the conclusion of the program, the portable in-situ RRA equipment, along with operating instructions for using and maintaining the prototype equipment, will be delivered to the Air Force.

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This website is maintained by: Gloria Hardy
Last Update: July 25, 2003