Addition agents hydrogen content and structure of electro-deposited manganese

The effect of various addition agents on the structure and hydrogen content of electro-deposited manganese has been studied. With the exception of boric acid, only cathodically reducible compounds of group VIB element S, Se and Te prevent the formation to gamma manganese and facilitate the deposition in alpha modification. Addition of organic inhibitors or polarizing agents, which increase cathodic polarization, do no yield deposition of alpha manganese. Alpha manganese is obtained when not only the cathodic polarization is increased but also the hydrogen content of the deposit is increased.