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Chemically activated nanodiamonds for aluminum alloy corrosion protection and monitoring

: Hannstein, I.; Adler, A.-K.; Lapina, V.; Osipov, V.; Opitz, J.; Schreiber, J.; Meyendorf, N.


Meyendorf, N.G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Smart sensor phenomena, technology, networks, and systems 2009 : 9 - 11 March 2009, San Diego, California; The Technical Conference of Smart Sensor Phenomena, Technology, Networks, and Systems
Bellingham, WA: SPIE, 2009 (Proceedings of SPIE 7293)
ISBN: 978-0-8194-7553-4
Paper 72930O
Annual International Symposium Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring <16, 2009, San Diego/Calif.>
Conference Smart Sensor Phenomena, Technology, Networks, and Systems <2009, San Diego/Calif.>
Conference Paper
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

In the present study, a smart coating for light metal alloys was developed and investigated. Chemically activated nanodiamonds (CANDiT) were electrophoretically deposited onto anodized aluminum alloy AA2024 substrates in order to increase corrosion resistance, enhance bonding properties and establish a means of corrosion monitoring based on the fluorescence behavior of the particles. In order to create stable aqueous CANDiT dispersions suitable for electrophoretic deposition, mechanical milling had to be implemented under specific chemical conditions. The influence of the CANDiT volume fraction and pH of the dispersion on the electrochemical properties of the coated samples was investigated. Linear voltammetry measurements reveal that the chemical characteristics of the CANDiT dispersion have a distinct influence on the quality of the coating. The fluorescence spectra as well as fluorescence excitation spectra of the samples show that corrosion can be easily detected by optical means. Furthermore, an optimization on the basis of "smart" - algorithms for the data processing of a surface analysis by the laser-speckle-method is presented.