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The paper proposes a method of laser treatment of the steel surface for protection against the formation of electrochemical corrosion. AISI 430 stainless steel plates were used in the work. The influence of laser structuring on the contact angle and the interaction of laser-structured steel surfaces with an aggressive environment during corrosion tests are considered. The composition of oxides formed after laser treatment, as well as the roughness of the modified surface, are considered. Positive dynamics in protection against pitting corrosion formation on the surface of metals have been revealed. [ABSTRACT FROM AUTHOR]

In this work, we studied a technology of laser-induced coloration of metals by surface oxidation. A method of complete color palette development for enhancement of the technological industrial application is demonstrated for the 1.06 µm fiber laser with nanosecond duration of pulses. It is based on reflectance spectra dependence on laser processing parameters. AISI 304 stainless steel example confirms an applicability of this method. However, the results can be similarly used for other oxidizing metals and alloys under normal conditions. Sample color dependence on the light incidence angle (viewing angle) is also presented. [ABSTRACT FROM AUTHOR]

In this work, we studied a method of laser-induced coloration of metals, where small-scale spatially periodic structures play a key role in the process of color formation. The formation of such structures on a surface of AISI 304 stainless steel was demonstrated for the 1.06 µm fiber laser with nanosecond duration of pulses and random (elliptical) polarization. The color of the surface depends on the period, height and orientation of periodic surface structures. Adjustment of the polarization of the laser radiation or change of laser incidence angle can be used to control the orientation of the structures. The formation of markings that change their color under the different viewing angles becomes possible. The potential application of the method is metal product protection against falsification. [ABSTRACT FROM AUTHOR]