Electrolytic aluminizing of low-carbon steel in NaF44.4-(AlF3)55.6 (wt.%) melt implies formation of a multi-phase diffusion zone consisting of iron aluminides including FeAl3, Fe2Al5, Fe3Al and Al solid solution in α-Fe (Fe(Al)). The influence of current density on morphology of the aluminide coating was investigated and the most uniform and continuous intermetallic layer with fewer inclusions of electrolyte obtained at the current density of 0.8 A∙cm-2. An aluminum oxide layer formed on the surface of the steel during oxidation treatment at elevated temperature (700, 900 °С) in air acts as a diffusion barrier and protects the material from further oxidation.