Accession Number : ADA290249

Title :   The Use of EIectrochemistry and Ellipsometry for Identifying and Evaluating Corrosion on Aircraft.

Descriptive Note : Final rept. 15 Jun-15 Dec 94,

Corporate Author : DACCO SCI INC COLUMBIA MD

Personal Author(s) : Dacres, Chester M. ; Taggart, Brian C. ; Anderson, Charles R. ; Whisnant, Pam

PDF Url : ADA290249

Report Date : 15 DEC 1994

Pagination or Media Count : 84

Abstract : Electrochemical corrosion testing using AC impedance measurement and ellipsometry has been performed on aircraft aluminum 2024-T3 samples. The AC Impedance technique was used to acquire a precise low-frequency impedance signature of corroding painted aircraft aluminum which will be used to develop a simple, yet powerful, sensor for the early detection and measurement of corrosion processes on aircraft. The use of ellipsometry and DC electrochemical techniques, have verified that the low-frequency impedance spectrum obtained from the AC Impedance technique is representative of the corrosion process for painted aircraft aluminum 2024-T3. Based on these findings, several versions of prototype electrode sensors were developed capable of obtaining this signature utilizing a two-electrode approach. These in-situ electrode sensors were extensively tested using AC Impedance, electrochemistry, ellipsometry, and X-ray Photoelectron Spectroscopy. Results indicate the ability of the electrode sensors to non-destructively monitor the corrosion process on aircraft aluminum 2024-T3 and to withstand harsh operating environments. (jg) p.2

Descriptors :   *AIRCRAFT, *CORROSION, *ELECTROCHEMISTRY, *ELLIPSOMETERS, TEST AND EVALUATION, MEASUREMENT, DETECTION, PROTOTYPES, ALTERNATING CURRENT, IDENTIFICATION, SPECTRA, X RAY PHOTOELECTRON SPECTROSCOPY, ALUMINUM, ELECTRODES, PRECISION, SIGNATURES, PAINTS, IMPEDANCE, DIRECT CURRENT, LOW FREQUENCY.

Subject Categories : Physical Chemistry
      Aircraft
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE