To enable the use of metallic components in direct methanol fuel cells(DMFCs), issues related to corrosion resistance must be considered because of an acid environment induced by the solid electrolyte. In this study, we report the electrochemical behaviors of metal-fiber-based porous sintered components in a simulated corrosive environment of DMFCs. Three materials were evaluated: pure copper, AISI304, and AISI316 L. The environmental factors and related mechanisms affecting the corrosion behaviors were analyzed. The results demonstrated that AISI316 L exhibits the best performance. A higher SO42- concentration increases the risk of material corrosion, whereas an increase in methanol concentration inhibits corrosion. The morphological features of the corroded samples were also characterized in this study. To enable the use of metallic components in direct methanol fuel cells (DMFCs), issues related to corrosion resistance must be considered because of an acid environment induced by the solid electrolyte. In this study, we report the electrochemical behaviors of metal-fiber-based porous sintering components in a simulated corrosive environment of DMFCs. Three materials were evaluated: pure copper, AISI 304, and AISI 316 L. The environmental factors and related mechanisms affecting the corrosion behaviors were analyzed. higher SO42- concentration increases the risk of material corrosion, an an increase in methanol concentration inhibits corrosion. The morphological features of the corroded samples were also in this study.