Preparation And Properties Of Superhydrophobic Surfaces On Titanium Alloy Ti6Al4V Substrates

Due to the excellent comprehensive properties of titanium alloys,such as low density and high specific strength,and with the continuous development of low-cost titanium alloys and the continuous innovation of manufacturing process,the application of titanium alloys in automotive field has gradually come into people’s attention.Super hydrophobic structure was constructed on the surface of titanium alloy by surface treatment technology,which can make the surface of titanium alloy have self-cleaning function and excellent anti-icing performance,which can promote the further application of titanium alloy to a certain extent.However,there are still some problems in the preparation of superhydrophobic surfaces based on titanium alloy substrates,such as the need for special equipment,harsh preparation conditions,complex technology and difficulty in large-scale preparation.Therefore,it is of great significance for the further application of titanium alloys to construct superhydrophobic surfaces on titanium alloy substrates by a simpler method.Firstly,based on this point of view,the superhydrophobic surface with micro-nano-composite structure on Ti6Al4 V substrate was successfully fabricated by chemical etching and high temperature baking without any fluorination modification of low surface energy materials.The contact angle of water droplets reached 163.1 degrees and the sliding angle was as low as 5.3 degrees.This method has the advantages of simple and convenient preparation process,large area preparation,no need for special equipment such as reactor and low surface energy material fluorination modification,etc.Then the wettability of superhydrophobic surface was analyzed by contact angle measuring instrument and rolling angle measuring instrument.The effects of chemical etching time,high temperature drying time and drying temperature on the experimental results during the preparation of Ti6Al4 V superhydrophobic surface were investigated.The morphology,element composition and crystal composition of Ti6Al4 V superhydrophobic surface were characterized by SEM,EDS and XRD,and the formation mechanism of superhydrophobic surface was explored.Finally,a self-cleaning comparative experiment was designed to test its self-cleaning performance;the durability of the samples was tested by placing them in air;the corrosion resistance of the samples was tested by simulating corrosion in 3.5wt% NaCl solution;the wear resistance of the samples was tested by designing friction experiments;Water droplets were placed on superhydrophobic surface and ordinary surface.Then they were placed in refrigerator at the same time.The freezing speed of water droplets was compared to test their anti-freezing performance.Comprehensive analysis shows that Ti6Al4 V superhydrophobic surface has good self-cleaning performance,durability,corrosion resistance,friction resistance and icing resistance.