Passivity of 13Cr Stainless Steel in 1% NaCl Solution under Dynamic Supercritical CO₂ Conditions

Abstract

The passivity of 13Cr stainless steel in 1% NaCl solution under dynamic supercritical CO2 (SC-CO2) conditions without or with different partial pressures of O2 was studied by electrochemical measurements and surface characterization. Electrochemical measurements indicate that both the fluid flow and an increase in CO2 pressure lead to a decrease in the stability of the passive film. Introduction of 0.1 MPa O2 into the dynamic SC-CO2 system facilitates the formation of a stable and integrated passive film, which enhances the corrosion resistance of 13Cr stainless steel. However, the addition of 1 MPa O2 reduces the stability of the passive film and results in the formation of a passive film with high donor density, which decreases the corrosion resistance of 13Cr stainless steel.

Influences of NH4+ ions and thin electrolyte layers (TEL) thickness on the corrosion behavior of AZ91D magnesium alloy

“…All fitting electrochemical parameters are listed in Table . In this work, R p = R surf + R ct , i.e., the polarization resistance, is used to evaluate the corrosion resistance of AZ91D magnesium alloy . Obviously, for bulk solution and TEL, the R p decreases as the introduction of NH 4 + and continues to decrease with further increase of NH 4 + concentration, i.e., the introduction of NH 4 + lowers the corrosion resistance of AZ91D magnesium alloy and the increase in NH 4 + concentration further exacerbates the corrosion of AZ91D magnesium alloy, which is in line with the analysis of cathodic polarization curves.…”

Electrochemical behavior of 2205 duplex stainless steel in simulated solution containing high concentration Cl− and saturated CO2 at different temperatures

“…It can be seen that at 30 °C, 45 °C, 60 °C and 75 °C, the structure of the film layer was transformed from dense to loose porosity according to the fitted linear slope. According to the point defect model (PDM) 36 , 37 , it is known that the potential applied during the test did not affect the current density, indicating that the temperature directly affected the measurement of the anode current density during the test, thus the current density increased and the corrosion resistance of 2205 DSS decreased with the increase of the solution temperature.…”