Studies in chemical phase analysis. Part III. Determination of the solubilities of certain elements and compounds pertinent to steels in organic solvent-halogen mixtures with particular emphasis on manganese silicon nitride

Abstract

To assist in the development of methods for the determination of manganese silicon nitride in steels containing aluminium or niobium nitrides, the solubilities of iron and manganese silicon nitride have been determined in methanol and methyl acetate each containing a halogen or an interhalogen compound. Such studies indicate that the best solvent for the determination of aluminium nitride or niobium nitride in the presence of manganese silicon nitride is iodine trichloride-methyl acetate under reflux. However, for the isolation of manganese silicon nitride together with the more stable nitrides, iodine-methyl acetate is the best solvent.

The solubilities of iron and certain other elements and of some compounds of iron and manganese have been determined in iodine-methanol solution (1 + 10 m/V). The solvent is recommended for the isolation of iron(II) and manganese(II) oxides from steels but iron(II) and manganese(II) sulphides and cementite are appreciably attacked by the solvent.