Method for preparing titanium-alloy super-hydrophobic surface with low roughness

Abstract

The invention provides a method for preparing a super-hydrophobic surface with low roughness on titanium alloy, belongs to the field of surface treatment on metal materials, and relates to a technical method for preparing a titanium-alloy super-hydrophobic surface by adopting electrochemical anodic oxidation in an alkaline solution. The titanium-alloy super-hydrophobic surface with the low roughness is prepared by the adoption of the electrochemical anodic oxidation in the alkaline solution, and the method comprises the following steps: adopting metallographic abrasive paper to polish the titanium alloy; putting the polished titanium alloy into acetone, ethanol and deionized water respectively for ultrasonic cleaning in order to eliminate oil stain; placing a titanium-alloy plate adopted as the anode and a graphite plate adopted as the cathode in parallel symmetrically, and connecting the titanium-alloy plate, which is connected with the positive pole, and the graphite plate, which is connected with the negative pole, with a direct current supply through conducting wires respectively; conducting anodic oxidation; after the anodic oxidation, putting the titanium alloy into the deionized water for ultrasonic cleaning. The method is economical, high-efficient, simple in technology and good in controllability; particularly, the prepared super-hydrophobic surface is low in roughness.

Description

technical field [0001] The invention belongs to the field of metal material surface treatment, in particular to a process method for preparing a titanium alloy super-hydrophobic surface by electrochemical anodic oxidation in an alkaline solution. Background technique [0002] A superhydrophobic surface refers to a surface with a contact angle with water droplets greater than 150° and a rolling angle less than 10°, which has the characteristics of self-cleaning, anti-corrosion, anti-icing, and water flow drag reduction. The super-hydrophobic surface is applied to metal materials, which can play the role of anti-fouling, anti-rust, and anti-icing; applied to the shell of ships or the inner wall of pipes, it can effectively reduce the frictional resistance with the water flow. Titanium alloy has the characteristics of light weight, high strength, high temperature resistance, corrosion resistance, etc. It has very important applications in many industries such as aviation, chemi...

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Problems solved by technology

For example, Chinese Patent No. CN102618913A discloses a method of anodically etching titanium or titanium alloys in NaCl or NaBr solution to construct a micro-nano rough structure and modifying with fluorosilane to obtain a super-hydrophobic surface. This method has high efficiency, but due to The unevenness of anode etching can easily lead to large surface roughness; Zhang et al. in F. Zhang, S. Chen, L. Dong, Y. Lei, T. Liu, Y. Yin, Appl. Surf. In 257 and 2587, pure titanium is first put into an ethylene glycol solution containing ammonium fluoride for 5 hours of anodic oxidation, and then modified with low surface energy substances to obtain a superhydrophobic titanium surface. This method takes a long time to process and is more efficient. Low; Lin et al. in Y.K.Lai, C.J.Lin, J.Y.Huang, H.F.Zhuang, L.Sun, T.Nguyen, Langmuir.2008, 24, 3867, using electrochemical anodic oxidation method to prepare superhydrophobic titanium surface, using platinum as Cathode, hydrofluoric acid as electrolyte, because platinum is a precious metal, the cost of this method is relatively high

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