超快激光工艺参数对不锈钢表面着色的影响

Effects of Processing Parameters of Ultra-Fast Laser on Surface Coloring of Stainless Steel

利用皮秒激光在304不锈钢上进行表面着色试验研究。分析了皮秒激光对不锈钢表面着色的机理,建立了表面色彩的模型。分别试验研究了扫描线间距、扫描速度和脉冲能量等激光工艺参数对着色效果的影响。研究结果表明,改变线间距、扫描速度和功率均能对着色效果产生显著影响,在扫描速度90~300μm/s,扫描线间距0.001~0.01mm,单脉冲能量60~140mJ/cm^2的参数范围内能得到较好的色彩,而且三者对着色有近似的影响效果。在试验基础上,获得了皮秒激光参数与CIE L*a*b*色彩模型之间的关系。最后对着色后的试样进行了颜色老化对比试验。老化对比试验表明,不同老化时间下的激光着色试样的色差值ΔE均很小,说明各试样颜色接近,耐老化效果较好。

Experiment study on surface coloring of 304 stainless steel is carried out by using picosecond laser. The mechanism of the coloring on stainless steel surface by picosecond laser is analyzed, and the surface color model is established. The influence of the laser processing parameters such as scanning line spacing, scanning speed and pulse energy on coloring effect is studied, respectively. Experimental results show that changes of line spacing, scanning speed and pulse energy have a significant impact on the coloring effect, and good color can be obtained with the parameters range of scanning speed from 90 μm/s to 300 μm/s, line spacing from 0. 001 mm to 0.01 ram, and single pulse energy from 60 mJ/cm^2 to 140 mJ/cm^2. The effects of three parameters on coloring have similar impact. Based on the experiment, the relationship between the parameters of picosecond laser and the CIE L ^＊ a ^＊ b^ ＊ color model is obtained. Finally, the color aging contrast test of the samples after coloring is carried out. Experimental results show that the chromatic aberrations △E of laser coloring samples with different aging time are very small, which indicate that all samples are very similar. And they have good anti-aging effect.