Synthesis of nanocrystalline Fe-Co and Fe-Co-TiO_2 ferromagnetic coatings obtained by pulse electrodeposition

摘要

This research is concentrated on evaluating the relationship between pulse current density with microstructure, tribological behavior, and magnetic properties of nanocrystalline Fe-Co and Fe-Co-TiO_2 ferromagnetic coatings. The results indicated that the higher current density led to increase in microhardness of the Fe-Co-TiO_2 composite coatings to about 628 HV. Also, the higher current density caused to improve the wear resistance, so that the average friction coefficient and wear rate of Fe-Co-TiO_2 composite were decreased to 0.54 and 0.46 × 10~(-3) mg/N m, respectively. Vibrating sample magnetometer measurements demonstrated that as the deposition current density was increased, the saturation magnetization (M_s) and coercivity (H_c) were decreased. Moreover, M_s and H_c related to Fe-Co-TiO_2 coatings were lower than those of the Fe-Co coatings. The highest M_s and lowest H_c corresponding to the electrodeposition coatings were obtained at a pulse current density of 100 mA/cm~2.