Abstract
The influence of AC interference on the pitting and cracking behaviors of carbon steels under cathodic protection was studied by electrochemical and mechanical tests, complemented by surface characterization techniques. Larger and deeper pits were found at higher AC voltage and smaller exposed area. Brittle fracture morphology and pit-to-crack transition behavior were observed at −1.12 VSCE with 3 V rms AC. Cracks initiated inside pits in the necking region at stress above UTS, and preferentially evolved from pit mouth. Pits initiated without tensile stress and pit growth was affected by a combination of electrochemical and mechanical factors.
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