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Abstract
Corrosion products of carbon steel in a simulated solution containing Cl − and SO 4 2 - were investigated by in situ Raman spectroscopy with a self-designed device. The results of Raman test and the SEM/EDS analysis of samples in different immersion times indicate that the corrosion products on the surface of the carbon steel consist of double rust layers, i.e. a porous outer layer (lepidocrocite γ-FeOOH) and a compact inner layer (magnetite Fe 3O 4). Aggressive ions such as Cl − and SO 4 2 - promote corrosion leading to the formation of lepidocrocite γ-FeOOH. Weight loss vs. time curve was also measured to study the effects of corrosion products. Corrosion products on a parallel sample were tested by Raman spectroscopy in air environment, which shown a distinct result from the one of in situ test.
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