The transient current behavior during the corrosion fatigue was studied for an LY12CZ aluminum alloy in 3.5%NaCl solution under load control at an applied constant potential. During the test the specimen surface was in-situ observed by Questar Remote Measurement System (QRMS). The micrograph of the surface with different maximum loads had been taken during the tests. The observations indicated that the transient current response during corrosion fatigue could be well related to the surface damage, e.g. the formation of the corrosion pits and the initiation process of the cracks. At low stress, there is almost one current peak in one fatigue cycle at the first and last stage of fatigue cycling. At high stress, there are two peaks at all stages because of the large amount of local plastic deformation on the surface.
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