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electrochemical conversion coating of) firearms to protect them from rust and corrosion, and these methods have been in widespread use ever since. manganese has no satisfactory substitute in its major applications. in minor applications, (such as manganese phosphating), zinc and sometimes vanadium are viable substitutes
biological role manganese (in the form of manganese ions ) is an essential trace nutrient in all known forms of life . many classes of enzymes have manganese cofactors. they include oxidoreductases, transferases, hydrolases, lyases, isomerases, ligases, lectins, and integrins. the best-known manganese-containing...
https://www.newworldencyclopedia.org/entry/Manganese