Experimental Study on Bionic Groove Structure by Nanosecond Laser

Using nanosecond laser the bionic groove structures were fabricated on the surface of aluminum alloy. The microstructure of the sample surface and surface wettability were observed by scanning electron microscope (SEM) and OCA20 video optical contact angle measuring instrument, respectively. It was found that the change of groove structure and size on the surface of aluminum alloy material was the main reason for the changes of hydrophobic properties. In addition, the increase of oxygen on the surface of the material was also one of the reasons for its increased hydrophobicity. The groove structure with larger width and depth can be achieved by increasing the power of laser. This was because the larger the laser power is, the smaller the scanning speed, and the accumulation of energy and temperature caused by the overlapping of the processing parts was the cause of the increase in the width and depth of the grooves.