Yes, but not exactly like iron. The more precise term is that it corrodes or oxidizes.

• It Tarnishes: Like many metals, manganese reacts with oxygen in the air to form a surface layer of oxide. You would see it lose its shiny, silvery appearance and become dull.
• It Corrodes Easily: Manganese is quite reactive. It corrodes readily in moist air and will dissolve in many acids.
• The Oxide Layer: Unlike the red, flaky rust (Fe₂O₃) that weakens iron, the oxide layer that forms on manganese (primarily MnO₂) can be more protective and stable. However, the metal itself is still susceptible to degradation in corrosive environments.

For practical purposes, yes, manganese metal will corrode and is not considered a corrosion-resistant metal like stainless steel or aluminum.

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