摘要： The article is devoted to the research of the opportunity for the increasing corrosion resistance of steel. The results of the experiments of laser processing of model samples made of carbon steel with CW ytterbium fiber laser at a wavelength of 1.06 micron. It is shown that laser processing can form resistant protective film with a thickness of 2–3 microns on the steel surface, which improve anti-corrosion properties of metal. One of the possible reasons for the increase in corrosion resistance of steel is the microstructuring of its surface to form a thin film of iron carbide (Fe3C), which is formed as a result of heating in the temperature range from 600 to 1000 °C. Besides, the exposure to laser radiation leads to reduction of surface roughness (from Ra = 0.53 μm to Ra = 0.48 μm). Optimal (from the point of view of the degree of resistance to corrosion) steel processing mode corresponds to the density level of laser radiation power density of 1.5 · 105 W cm?2, the conducted research allows to conclude that the use of CW fiber lasers is a promising method of improving the corrosion resistance of carbon steel.