Results of study of structure, physico -mechanical and operational properties of composite coatings on the basis of iron- cobalt alloys strengthened by particles of aluminum oxide are shown. Codeposition of compositions is carried out from electrolytes of the suspensions formed by mixture of water solutions of salts of iron (chloride of iron), salts of cobalt (sulfate of cobalt) and firm particles of aluminum oxide. Particles of aluminum oxide are distributed evenly throughout a metal matrix of iron-cobalt alloy. The structure of composites is homogeneous and fine-grained with a crystal grain less than 500 nanometers. The electrolytical composite of iron-cobalt alloy has higher microhardness than the same alloy obtained without particles. Wear resistance of compositions depends on concentration and the size of disperse particles and increases with the increase of concentration of hard particles.