The present work investigates the corrosion behavior of 2205 duplex stainless steel in 0.9% NaCl solution after various heat‐treatments, and compares it to that of 316L austenitic stainless steel. Both stainless steels were heat‐treated at 500, 650, and 800
$^{\circ}$
C in air for 1 h, followed by furnace cooling. Each heat‐treated sample was examined for their microstructures and Vickers micro‐hardness, and subjected to the X‐ray diffraction for the phase identification. Using potentiostatic polarization method, each heat‐treated sample was corrosion‐tested in 37
$^{\circ}$
C 0.9% NaCl solution to estimate its corrosion rate. It was found that simulated sensitization showed an adverse influence on both steels, indicating that corrosion rates increased by increasing the sensitization temperatures.
