Corrosion Behavior of 2205 Duplex Stainless Steels in HCl Solution Containing Sulfide

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Abstract
The corrosion behavior of 2205 DSS in HCl solutions containing sulfide were investigated using mass loss test, electrochemical measurements, scanning Kelvin probe, scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The results showed that Na2S had significant effect on corrosion behavior of 2205 DSS in dilute HCl solutions. Slight Na2S can prevent the passive film from localized attacking of Cl− in HCl solution with a concentration lower than 0.1 mol/L. However, when the concentration of HCl solution higher than 0.137 mol/L, Na2S addition will tremendously promote corrosion. The intergranular corrosion combined surficial active dissolution of 2205 DSS could happen in HCl + Na2S solution.
Funding Information
  • Applied Basic Research Programs of Science and Technology Department of Sichuan Province (2017JY0044)
  • Scientific Research Innovation Team of Universities Affiliated to Sichuan Province (18TD0012)
  • National Science and Technology Major Project (2017ZX05030-001)

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