In this investigation, electrochemical experiments were performed with temperature in green death solution (GDS), a representative solution that simulates the environment of a desulfurization device, and seawater for austenitic stainless steel (UNS S31603, UNS N08367). Electrochemical experiments were carried out by potentiodynamic polarization experiment and cyclic potentiodynamic polarization experiment.
First, the electrochemical characteristics presented in the polarization curve were analyzed for each material.
Second, the degree of corrosion damage of austenitic stainless steels was compared and analyzed using a 3D microscope and SEM analysis after the electrochemical experiment.
Third, Depth histograms were applied to indicate the tendency of corrosion of each material with temperature.
Finally, the relationship between the corrosion rate by maximum damage depth and the corrosion rate by the corrosion current density was expressed as α value for each stainless steel.
It was represented that corrosion resistance improved as the content of alloying elements (Mo, Cr, N) affecting the pitting resistance equivalence index (PREN) increased.
This paper is expected to serve as a reference data in selecting materials for simultaneous reduction post-processing devices by evaluating durability with pitting resistance equivalent index.