Significance of superhydrophobic coating on medical titanium alloy Ti-6Al-4V

Superhydrophobic surface has excellent self-cleaning, waterproof, anti-corrosion, anti-snow, anti-freezing, anti-pollution, anti-biological attachment, antibacterial and other functions, in the clothing textile, biomedical, daily necessities and packaging, construction, transportation tools and microanalysis and other fields have an extremely wide range of application prospects and value. Especially in recent years, superhydrophobic surfaces have been introduced into biomaterials such as medical instruments and artificial blood vessels to improve their anticoagulation and blood compatibility.

Based on the theory of superhydrophobicity and bionics, the superhydrophobicity of metal materials is mainly realized by constructing micro-nano layer structure and modifying with low surface energy. The micro-nano structure can be constructed by etching, templating, electrodeposition, sol-gel stream, hydrothermal treatment, anodic oxidation bucket and micro-arc oxidation. Low surface energy substances mainly include fluorocarbon resins (polytetrafluoroethylene), silicone resins (polydimethylsiloxane), fluorosilicone resins (fluorosilicane) and long chain polymers (stearic acid), etc. Micro-arc oxidation is a technology developed on the basis of anodic oxidation. Ti, Mg, A1 and other valve metals or their alloys were placed in an aqueous electrolyte solution, and spark discharge spots were generated in the surface pores of the materials by electrochemical method. Under the joint action of thermochemistry, plasma chemistry and electrochemistry, ceramic films were formed in situ. The ceramic film has high bonding strength, which can effectively improve the corrosion resistance, wear resistance and biocompatibility of the substrate.