纳秒激光加工铝合金表面润湿性转变研究

Study on the Wettability Transition of Aluminum Alloy Surface Processed by Nanosecond Laser

铝合金经过激光加工后,铝合金表面会呈现出明显的超亲水过渡状态,为了探究不同激光加工参数制备的微沟槽结构对铝合金表面润湿性的影响,通过纳秒激光在铝合金表面进行微沟槽结构的制备,通过改变激光参数对微沟槽结构形貌和尺寸进行调整,使铝合金表面具有了一定的粗糙结构和良好的超亲水性。得到了最优润湿性的激光参数为激光功率12 W,扫描速度200 mm/s,激光填充间隙为0.01 mm。激光加工后的铝合金表面吸收空气中足够多的非极性分子后润湿性变差,通过能量色散X射线光谱仪和能谱分析对铝合金表面进行分析发现氧化效应是从超亲水性到疏水润湿性变化的主要原因。

After the aluminum alloy is laser processed,the surface of the aluminum alloy will show an obvious super-hydrophilic transition state to explore the influence of the micro-groove structure prepared by different laser processing parameters on the wettability of the aluminum alloy surface. In this paper,nanosecond laser is used to prepare the micro-groove structure on the surface of aluminum alloy;and the morphology and size of the micro-groove structure are adjusted by changing the laser parameters,so that the surface of the aluminum alloy has a certain rough structure and good super-hydrophilicity. The laser parameters for obtaining the optimal wettability are the laser power 12 W,the scanning speed200mm/s;and the laser filling gap is 0.01 mm. The surface of the aluminum alloy after laser processing absorbs enough non-polar molecules in the air and the wettability becomes worse. The surface of the aluminum alloy is analyzed by energy dispersive X-ray spectrometer and energy spectrum analysis. It is found that the oxidation effect is from super hydrophilic to the main reason for changes in hydrophobic wettability.