Corrosion resistance of highly dispersed iron

The use of highly dispersed iron in technology and medicine is limited by its tendency toward oxidation. Both the problem of formation of iron particles with dimensions in the tenths and hundredths of microns and the possibility of passivation of their surface are pressing. With solution of these problems highly dispersed iron may be used for production of magnetic materials, catalysts, adsorbents, active reinforcing additions, fillers of different matrices, carriers of medicinals in directed transport of them in magnetic fields, and many other substances. This work is devoted to a study of the corrosion resistance of highly dispersed iron powders in air and in an acid medium. The work was done on highly dispersed iron powders with dendritic and ellipsoidal particle shapes (subsequently we will call them the first and second iron powders, respectively).