| The super-hydrophobic and corrosion-resistant surface provide a brand-new technical method for the field of anti-corrosion.It can be realized on the surface of a variety of materials,and its preparation methods are diverse.At the same time,this technology has relatively small requirements on the geometry of the base material.It can satisfy the surface anti-corrosion in different fields,environments,and other conditions in various preparation schemes.The main principle is to isolate the surface of the protected device from the corrosion source to prevent corrosion.Among the many preparation technologies,laser interference lithography and electrochemical anodization technology can realize large-area manufacturing.The operation is relatively simple,which has special advantages for preparing super-hydrophobic surfaces of metal substrates.The titanium alloy has excellent corrosion resistance and biocompatibility.It is stable because the titanium elements can form a dense oxide film with oxygen at room temperature.Generally,the oxide film can recover quickly after being mechanically damaged.However,the layer of the stable oxide film is difficult to recover in an oxygen-deficient environment.Therefore,preparing a corrosion-resistant surface with super-hydrophobic properties on the surface of titanium alloys to enhance corrosion resistance has specific research significance.The main experimental results of this paper are as follows:(1)A super-hydrophobic and corrosion-resistant surface were prepared on the surface of TC4alloy by the anodizing one-step method.The surface morphology,element distribution,main components,wettability,and adhesion of four current densities groups:0.20A·cm-2,0.25A·cm-2,0.30A·cm-2,0.35A·cm-2,were characterized by SEM,XPS,EDS and contact angle measuring instrument.The changes in surface morphology,wettability,and adhesion under different reaction conditions were analyzed.The rough surface's electrochemical characteristics were characterized by the EIS and Tafel polarization curve.The changes under different anodizing reaction conditions were analyzed.(2)The influence of laser interference pretreatment on rough surfaces was studied.The smooth TC4 titanium alloy surfaces were pretreated by laser interference lithography Under the conditions of three laser beam energy densities of 30mJ·cm-2,60 mJ·cm-2,and 70 mJ·cm-2.The samples(0.25A·cm-2,420s),which were pretreatment with four laser energy densities:0mJ·cm-2,30mJ·cm-2,60mJ·cm-2,70mJ·cm-2,were characterized by SEM test,contact angle test,and electrochemical test.And the laws of change were analyzed by their surface morphology,wettability,and corrosive properties of samples.The experimental results showed that the super-hydrophobic anti-corrosion surface's corrosion resistance increases with prolonging the treatment time and it exhibits good corrosion resistance.Simultaneously,a certain degree of laser interference pretreatment could enhance the superhydrophobic corrosion resistance of surface,but it will slightly weaken its hydrophobicity.The self-corrosion current density of superhydrophobic corrosion-resistant surface without laser interference pretreatment was reduced by two orders of magnitude than the smooth TC4 surface.The self-corrosion current density of the superhydrophobic corrosion-resistant surface with laser interference was reduced by one order of magnitude,but the self-corrosion potential was significantly increased.This paper proposes a relatively simple method for preparation of functional surfaces.The super-hydrophobic and anti-corrosion surface is directly prepared on the surface of TC4 alloy by one-step anodic etching.It can enhance the corrosion resistance of super-hydrophobic surface by an appropriate amount of laser pretreatment.It has a certain reference value for the preparation of microstructures with wetting characteristics on different metal surfaces. |
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