“…It has been found that the satisfactory effects of minimizing the effect of the oxide phases presence can be obtained by pre-etching of powders surface. Further limitation of corrosion processes can be obtained in the process of magnetic powder encapsulation RE-M-B with Ni-P coatings, phosphate coatings, Cu coatings, silicate coatings, or surface modification [12][13][14][15]. In addition, to ensure adequate durability of the composite material, the material used as a binder should be as low as possible permeable to the environment -poorly absorbable, because bonding material can play role of an additional protective coating (biencapsulation).…”