EXPERIMENTAL RESEARCH ON CHROMATICITY FORMATION ON METALS SURFACE BY LASER RADIATION

The paper presents experimental studies and the way of chromaticity formation on stainless steel surface at the exposure of pulse laser radiation. Methods of reflection coefficient calculation of oxide iron films on iron are described. We perform calculation of reflection coefficient dependence on wavelength in the visible range and thickness of an oxidic film on the marked surface. The effect is shown that an oxidic film thickness has on the formed surface color owing to interference on the system of films of iron oxide and iron. It is shown how reflection function is displaced to the left and its amplitude decreases with the hade increase. By results of raster electronic microscopy significant oxygen increase in the places of exposure is recorded that points to formation of oxidic films. The profile analysis of oxidic films obtained on the metals surface is carried out and the dependence of chromaticity of the modified surface on laser radiation parameters is shown