Effect of Concentrations of Fe2+ and Fe3+ on the Corrosion Behavior of Carbon Steel in Cl− and SO42− Aqueous Environments

다국어 초록 (Multilingual Abstract)

The concentration of metal ions in aqueous environments signifcantly afects the formation of corrosion products and furthermetal corrosion. In this paper, the electrochemical behavior of carbon steel in the presence of Fe2+ or Fe3+ concentrationin Cl− and SO42− aqueous environments have been investigated using conventional electrochemical methods such as linearpolarization and alternating current impedance spectroscopy. The morphology and composition of carbon steel corrosionproducts were studied using scanning electron microscopy and laser Raman spectroscopy. The efects of corrosion productsand iron ions concentration on the corrosion of carbon steel were discussed. Corrosion products of carbon steel in aqueousenvironments were γ-FeOOH, γ-Fe2O3 and a small amount of α-Fe2O3. The addition of Fe2+ afected the cathode reactionof the electrode reaction, and promotes the formation of γ-FeOOH and Fe3O4. And with the increase of Fe2+ concentrationin the solution, the anode process of electrode reaction was suppressed. The addition of Fe3+ promoted the formation ofγ-Fe2O3 and Fe3O4. Fe3+ afected the ionization of water, causing the pH of the solution to drop. Fe3+ undergoes a redoxreaction with the matrix. Addition of Fe3+ ions promoted the formation of FeOOH, an intermediate product, which reactswith the anode product Fe2+. These factors all accelerated the corrosion process.

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