Fabrication And Research On Wettability Surface With Micro–Nanostructure Of Aluminum Substrate

In this pap er,aluminum was used as the s ubstrate,and the surface of the micro-nanostructure was successfully prep ared by anodic o xidation and femtosecond laser processing.The surface morphology and wettability were measured by observing the surface morphology of the prep aration.The experimental parameters,structure and surface composition of the correspo nding relationship between the analysis of surface function,structure,the interaction between the mechanism of nature.The preparation method has the advantages of simplicity,fastness and easy preparation of large area,and has wide application p rospect in the fiel d of infiltration func tional surface structure preparation.The details are as follows:(1)The experimental results show that the effect of anodic oxidation on the surface wettability of Al-based materials is studied.SEM and EDS were used to observe the microstructure and chem ical composition of d ifferent surfaces,and th e contact an gle correlation model and theory were analyzed an d explained.The results show that the anodic oxidation of the m icro-porous surface changes the surface structure of the material,and the anodic oxidation pore af fects the contact mode between the m aterial and the droplet.The surface roughness gradation changes the surface wettability of the sample.As the anodic oxidation pore size increases,the surface wettab ility of the sample changes from hydrophilic to hydrophobic.(2)Through the study of the characterist ics,system and process of fem tosecond laser processing,the micro-nanostructures were constructed on the surface of aluminum by femtosecond laser,and the surface characteristics of alum inum-based super-hydrophobic function prepared by di fferent femtosecond laser ener gy were analyzed and explored Its infiltration perf ormance changes in the way and principle.The final stable wetting state of the surface of the aluminum-based material after the femtosecond laser processing is related to the fe mtosecond laser pulse ener gy after aging.With the increase of the pulse ener gy,the surface contact angle is changed from the original 70 ° to above 150 °.During th e process of change,the surface morphology,roughness and chem ical composition of the alum inum base under dif ferent energy processing conditions are analyzed and analyzed.It is shown that the wettability of the sample after laser processing changes fr om the hydrophilic state to the hydrophobic state,and finally reaches the super-hydrophobic state.The super-hydrophobic surface is obtained in dif ferent pulse en ergy intervals,but there are non-periodic or periodic structural differences in the surface m icrostructure,so the principle of hydrophobic formation is different.