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A Multifunctional Coating for Autonomous Corrosion ControlThis slide presentation reviews the effects of corrosion on various structures at the Kennedy Space Center, and the work to discover a corrosion control coating that will be autonomous and will indicate corrosion at an early point in the process. Kennedy Space Center has many environmental conditions that are corrosive: ocean salt spray, heat, humidity, sunlight and acidic exhaust from the Solid Rocket Boosters (SRBs). Presented is a chart which shows the corrosion rates of carbon steel at various locations. KSC has the highest corrosion rates with 42.0 mils/yr, leading the next highest Galeta Point Beach, in the Panama Canal Zone with 27 mils/yr corrosion. A chart shows the changes in corrosion rate with the distance from the ocean. The three types of corrosion protective coatings are described: barrier (passive), Barrier plus active corrosion inhibiting components, and smart. A smart coating will detect and respond actively to changes in its environment in a functional and predictable manner and is capable of adapting its properties dynamically. The smart coating uses microcapsules, particles or liquid drops coated in polymers, that can detect and control the corrosion caused by the environment. The mechanism for a pH sensitive microcapsule and the hydrophobic core microcapsule are demonstrated and the chemistry is reviewed. When corrosion begins, the microcapsule will release the contents of the core (indicator, inhibitor, and self healing agent) in close proximity to the corrosion. The response to a pH increase is demonstrated by a series of pictures that show the breakdown of the microcapsule and the contents release. An example of bolt corrosion is used, as an example of corrosion in places that are difficult to ascertain. A comparison of various coating systems is shown.
Document ID
20110008511
Acquisition Source
Kennedy Space Center
Document Type
Presentation
Authors
Calle, L. M. (NASA Kennedy Space Center Cocoa Beach, FL, United States)
Hintze, P. E. (NASA Kennedy Space Center Cocoa Beach, FL, United States)
Li, W. (ASRC Aerospace Corp. Cocoa Beach, FL, United States)
Buhrow, J. W. (ASRC Aerospace Corp. Cocoa Beach, FL, United States)
Jolley, S. T. (ASRC Aerospace Corp. Cocoa Beach, FL, United States)
Date Acquired
August 25, 2013
Publication Date
February 23, 2011
Subject Category
Composite Materials
Report/Patent Number
KSC-2011-029
Meeting Information
Meeting: Smart Coatings 2011
Location: Orlando, FL
Country: United States
Start Date: February 23, 2011
End Date: February 25, 2011
Sponsors: Department of Defense
Distribution Limits
Public
Copyright
Public Use Permitted.

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