Preparation And Properties Of Superhydrophobic Surfaces On Titanium Alloy Substrate

With the rapid development of industry,the materials at this stage are gradually developing towards the trend of intelligence,light weight and high performance.Titanium alloy is a very important structural metal.It has the advantages of high strength,low density and good biocompatibility.It has wide applications in energy,aviation,medicine and chemical industries.However,titanium alloys also have many disadvantages,such as active chemical properties at high temperatures,low hardness,and poor wear resistance.Titanium alloys are susceptible to corrosion when the material is in an oxygen-deficient environment or in a high-temperature acidic environment.Therefore,we need to further improve the corrosion resistance of titanium alloys.Inspired by the lotus leaf effect,the superhydrophobic coating on the surface of titanium alloy can effectively improve its corrosion resistance,and the application range of titanium alloy can be further expanded due to the self-cleaning,waterproof and anti-icing functions of the superhydrophobic surface..In this thesis,the micro-nano roughness structure was constructed on the surface of titanium alloy by electrochemical deposition and anodization.The super-hydrophobic coating of titanium alloy with excellent performance was prepared by the modification of stearic acid with low surface energy.The main research contents and results are as follows:(1)A superhydrophobic coating was prepared by a combination of electrodeposition and stearic acid modification.The results show that the roughness and wettability of the surface can be effectively controlled by changing the electrodeposition current density and time.When the current density is 0.27 A/cm~2 and the electrodeposition time is 10 min,a micro-nano roughness structure can be formed,and a superhydrophobic coating can be obtained by stearic acid modification.The surface has a micro-nano scale roughness with a contact angle of 151.9°.In addition,the surface achieves a fast reversible conversion between superhydrophobic and hydrophilic under the alternating action of heat treatment and stearic acid modification,and it takes only 18 min to complete one conversion.In addition,the surface has good surface.The surface has good corrosion resistance in3.5%.wt.NaCl solution.(2)A superhydrophobic coating was prepared by a combination of anodizing and stearic acid modification.The results show that the roughness and wettability of the surface can be effectively controlled by changing the anodization time.The prepared superhydrophobic coating has a large number of protrusions and pit structures,is capable of capturing a large amount of air,and thus has a good superhydrophobicity with a contact angle of 153.5°.The self-cleaning test and surface stability test verified that the prepared superhydrophobic surface has good self-cleaning,durability and stability.