Aluminum And Stainless Steel Base Superhydrophobic Surface Preparation Technology

The wettability of solid surface represents a liquid between cohesion and adhesionto solid surface interaction. Study on the wettability of the surface reflected on the twoextremes, one Super hydrophilic, the second is super hydrophobic. Generally agreedwith Superhydrophobic properties of materials can reduce friction and reduce losses.Contents of this thesis is for the liquid floating rotors micro-gyroscope rotors,expectations on the aluminum and stainless steel substrate surface preparation of Superhydrophobic properties of thin film layer. Based on electrochemical methods, quicklyand efficiently in aluminum with stainless steel substrate preparation on integratedperformance of ultra hydrophobic surface, combined with the existing processcharacteristics and laboratory conditions, searching for a programme on the materialpreparation with large contact angle, high performance Super hydrophobic surfaces withsmall roll angle, thereby improving the micro-gyroscope rotor in high-speed flow ofnatural resources and life problems caused by running. Key elements include:Using high-current electrochemical etching method of surface fluorination methods,through large current oxidation process of alumina nanowires on the surface ofaluminum dissolution and collapse features, fast construction of micro-Nano-compositestructure with a pyramid. Studied etching time and effect of current density on surfaceroughness and hydrophobicity, got excellent hydrophobic properties of micro-Nanosurface structure, water contact angles up to160±1°.Two step etching method and surface chemistry-electrochemical fluorinationcombination of preparation, on preparation of Superhydrophobic stainless steelsubstrate. Mixed solution of hydrochloric acid and nitric acid for etching liquidchemical, the stainless steel surface uniform etching of micro structure andelectrochemical anode oxidation in perchloric acid solution, nano-structure of corrosion,thus forming a micro/Nano Super hydrophobic properties of composite structures.Surface antennas produced can be increased to151±1°. Studied etching time,concentration and voltage on the effect of surface topography as well asSuperhydrophobic properties.