SYMPOSIA PAPER Published: 01 January 1996
STP37973S

Electrochemical Noise Measurements During Exfoliation of Aluminum Alloys

Source

Electrochemical noise measurements (ENMs) have been carried out during exfoliation corrosion of an aluminum-lithium alloy (8090) in the EXCO (ASTM Test Method for Exfoliation Corrosion Susceptibility in 2XXX and 7XXX Series Aluminum Alloys [EXCO Test] [G 34]) test solution. By means of the maximum entropy method (MEM), the potential and current fluctuations were converted into power spectral density (PSD) plots to study the specific variables related to electrochemical noise (low frequency amplitude, slopes). Noise resistance obtained from the standard deviation of potential and current was compared with the charge transference resistance (Rct) from electrochemical impedance spectroscopy (EIS) measurements. The results show that ENM can be used to detect early stages in localized corrosion. However, when the solution is very aggressive, indications of localized corrosion can be masked by uniform corrosion.

Author Information

de Damborenea, J
Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avenida de Gregorio del Amo, Madrid, Spain
Fernández, B
Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Avenida de Gregorio del Amo, Madrid, Spain
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Details
Developed by Committee: G01
Pages: 398–410
DOI: 10.1520/STP37973S
ISBN-EB: 978-0-8031-5562-6
ISBN-13: 978-0-8031-2032-7