Stainless steels are considered a better alternative to common carbon steel due to their increased durability. The chromium included in stainless steel forms a more stable protective layer compared to carbon steel. Therefore, both experimental and computational research on the passivation and depassivation of stainless steel has been carried out to understand the underlying mechanisms and evaluate the differences. Jian et al. investigated the oxidation mechanism of Fe-Cr alloy surfaces compared to pure iron surfaces using ReaxFF-MD simulations. This study considered the neutral pH conditions while using NVT ensemble at a temperature of 320 ℃ for 1 ns. Several models have been considered by varying the chromium content and surface structures of low-indexed iron surfaces (100, 110, and 111).