ELECTROCHEMICAL CHARACTERIZATION OF THE RESISTANCE OF Al-Li ALLOY SHEET TO SEAWATER CORROSION

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Authors
  1. Roberge, P.R.
  2. Halliop, E.
  3. Lenard, D.
  4. Moores, J.G.M.
Corporate Authors
Royal Military Coll of Canada, Kingston ONT (CAN);Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
The electrochemical measurements obtained with the three orthogonal faces of commercial aluminum and aluminum-lithium sheet material were compared to the results obtained during the long term exposure of the same alloys to rea sea water. The results obtained during this extensive study indicated that short term EIS measurements can help to predict the general and localized corrosion behavior of this material when exposed to sea water. A systematic analysis of 610 fifteen minute noise records with the stochastic pattern detector technique has demonstrated that the exponential decay model describes very well the potential fluctuations observed during these experiments, thereby confirming the random nature of the corrosion processes in progress. The parameters revealed during the noise analysis were additionally related to the features calculated from EIS measurements or observed after long term exposure of the same alloys in a flowing sea water tank.
Keywords
EIS - Electrochemical Impedance Spectroscopy
Report Number
DREP-93-1-PAP-9 — CONTAINED IN DSIS 94-03057
Date of publication
01 Nov 1993
Number of Pages
13
DSTKIM No
94-03048
CANDIS No
141641
Format(s):
Document Image stored on Optical Disk;Originator's fiche received by DSIS

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