研究表面条纹微结构对激光诱导氧化膜着色机理的影响,具体分析不同工艺参数下激光诱导表面微结构的条纹宽度、条纹高度及条纹重叠度的变化特性。首先,通过改变离焦量、脉冲频率、扫描速度、条纹间隔、功率及打标次数等工艺参数来制备样本,观测并分析样本的条纹宽度受能量密度、光斑重叠度的影响,以估算条纹宽度。然后,通过条纹宽度和测量的表面粗糙度近似计算了条纹高度,理论与实际误差为-0.375 ~0.430 μm。同时,通过条纹宽度和条纹间隔计算了条纹间重叠度,并分析条纹高度、条纹间重叠度及表面粗糙度三者之间的关系。最后,通过表面粗糙度与条纹间隔计算类光栅闪耀角,发现类光栅闪耀角能更好地描述条纹凹凸程度。多次打标样本具有颜色饱和效应,并提出一种多层颜色打标模型。

This study aims at investigating the effect of the periodic surface microstructures on the coloring mechanism of laser-induced oxidation films. The variation characteristics of ripple width, ripple height, and ripple overlap of laser-induced surface microstructures under different process parameters are particularly studied herein. First, the samples are fabricated by varying the defocusing, pulse frequency, scanning speed, ripple spacing, power, and marking times. The influence of the energy density and spot overlapping on the ripple width of the samples is observed and analyzed to estimate the ripple width. Thereafter, the ripple height is approximately calculated through the ripple width and the measured surface roughness, and the error between theoretical and practical height are obtained from -0.375 μm to 0.430 μm. Furthermore, the ripple overlap is calculated using the ripple width and ripple spacing, and the relationship among ripple height, ripple overlap, and surface roughness is analyzed. Finally, the grating blaze angle is calculated using the surface roughness and ripple spacing. It is found that the degree of ripple concave and convex can be better described with the blaze angle of grating. The color saturation effect of multiple marking samples is determined, and a multilayer color marking model is proposed.