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The corrosion behavior of 2024 alloy in 0.6 mol/L NaCl solution has been studied by EIS, SECM and SEM at the corrosion potential. The EIS results show that the pitting could have occurred between 2 hr and 6 hr immersion and the corrosion dissolution becomes severe with the increase of immersion time. The SECM results reveal that the redox value and the dissolution active sites on the sample surface change with the immersion time. The oxidation current value increases rapidly between 0-3 hrs immersion and keeps about the same quantitative level after long immersion (3-48hrs). SEM morphology indicates that the pitting on the surface of the specimen has happened. At last, a model of local dissolution on grain boundary is put forward and can maybe describe how the initial stage of the corrosion process happens. It could be beneficial to explain the dissolution of intermetallic precipitates or aluminum around the IMFS on the surface of the specimen result in high oxidation current value.

Local Corrosion Behavior of 2024 Alloy in NaCl Solution by EIS and SECM