Study on decontamination process and effect of oxide layer on stainless steel surface

Laser decontamination technology is used to remove the oxidized layer on the surface of stainless steel, and the influence of different combinations of process parameters on the decontamination effect is investigated. The experiment adopts orthogonal experimental design, through the scanning electron microscope and energy spectrum analyzer to analyze the surface morphology and composition distribution of the specimen surface before and after laser decontamination; the use of metallurgical microscope to observe the cross-sectional organization of the specimen before and after laser decontamination; the use of BRUKER white-light interferometer to decontaminate the specimen three-dimensional morphology analysis, test its decontamination thickness and surface roughness. The results show that under the optimal process parameters (laser power of 180W, repetition frequency of 500kHz, travel speed of 5mm-s^-1, pulse width of 300ns), the oxidized layer on the surface of stainless steel is completely removed, and the thickness of the decontamination reaches 4.1 μm, and the surface roughness is reduced to 0.28 μm, and the surface of the decontaminated surface mainly consists of Fe, Cr, Ni and other matrix elements. Laser decontamination for stainless steel surface oxides have excellent decontamination effect.