Research on Wettability Characteristics of Micro Texture Surface of 7075 Aluminum Alloy Prepared by Ultrasonic Assisted Laser Processing
Changing the micro texture characteristics of metal surfaces can improve surface properties such as wetting and friction.Focusing on the preparation of micro textures on the surface of 7075 aluminum alloy by ultrasonic assisted laser processing,the mechanism of material removal by ultrasonic assisted laser action is revealed,and an ultrasonic assisted laser processing experimental platform is built.A single factor experiment on the micro texture surface of ultrasonic assisted laser processing is designed,and the surface microstructure and surface contour curve are obtained through a surface morphology analyzer.The water contact angle of the processed surface under different parameters is measured through a contact angle tester.The experimental results show that the ultrasonic assisted effect changes the microstructure of the laser processed surface,and the area,volume,and depth of the surface processed image are all increased.The contact angle of metal surface modified by ultrasonic assisted laser processing is analyzed,and the influence of laser and ultrasonic parameters on the wettability of the processed surface is obtained:the contact angle increases with the increase of laser power and ultrasonic vibration amplitude;with the increase of laser pulse frequency and laser scanning speed,it shows an initial increase followed by a decrease.
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