Dissertation > Excellent graduate degree dissertation topics show

Research on Fabrication of Superhydrophobic Surface on Aluminum Substrat

Author: ZuoQingLe
Tutor: XuWenZuo
School: Dalian University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Electrochemical Machining Superhydrophobic Surface Micro-nanostructure Grain Boundary/Dislocation Large Area Machining
CLC: TG178
Type: Master's thesis
Year: 2010
Downloads: 541
Quote: 2
Read: Download Dissertation

Abstract


Superhydrophobic surface, with a water contact angle greater than 150°and tilt angle less than 10°, is of great prospect applied in the fields of construction, textile, communication, military and aviation for its particular characteristics such as self-cleaning, anti-icing, anti-attrition, drag reduction and corrosion resistance. However, the development of superhydrophobic surface is restricted for the reason that either expensive equipment or complex process are usually required in the fabrication of superhydrophobic surface by the main technologies, which are also difficult to fabricate large area of superhydrophobic surface. Aluminum and its alloy are widely used in various industrial products for their physical and chemical properties. Therefore, it’s of great significant to develop a simple and inexpensive method to fabricate superhydrophobic surface, especially the large area of superhydrophobic surface on aluminum substrate.In this thesis, electrochemical anode etching method is developed to fabricate the superhydrophobic surface on the aluminum substrate. Furthermore, the method is carried out to prepare the large area of superhydrophobic surface successfully.By applying the neutral electrolyte (NaCl) and the applied field, the micro/nano-structure of the aluminum substrate is generated with applied electric field, which can induce the grain-boundaries/dislocations to dissolve prior to the grain itself. After modification with fluoroalkylsilane on the micro/nano-structure, superhydrophobic surface was obtained with water contact angle of 167°and tilt angle of 3°.Processing conditions such as electrolyte type, processing voltage, current, time were investigated to get their influence upon the superhydrophobicity of the surface, and the optimum processing condition was found. The scanning electronic microscope was used to investigate the micro-structure of the aluminum surface and showed that many pits of approximately 2-5μm in width and 2-5μm in depth are distributed on the aluminum surface. In addition, smaller step-like structures are evenly distributed on the whole surface, constituting the dual-scale micro/nano-structure, which is necessary to superhydrophobic surface.The influence of the surface morphologies with different removal weight on the superhydrophobicity of the surface is studied both macroscopically and microscopically, moreover, the influence of different removal speed under same removal weight on the superhydrophobicity of the surface is studied. Results shows that:for the aluminum plate of 9cm2, original surface is evenly and completely removed and superhydrophobicity of surface is obtained when removal weight reaches 0.20g; the superhydrophobicity of surface keeps excellent when the current density is smaller or equal to 25mA/cm2, but decreases when the current density exceeds 35mA/cm2.Electrochemical machining using a moving cathode is proposed to fabricate the large area of superhydrophobic surface. Experimental facility is established and the experiment is carried out. Results indicate that electrochemical machining is feasible to fabricate the large area of superhydrophobic surface by using the moving cathode, which solves the problem that the large area of superhydrophobic surface is difficult to prepare. Under optimum machining conditions, large area of superhydrophobic surface is achieved with water contact angle of 167°and tilt angle of 3°on average.

Related Dissertations

  1. Synthesis and Characterization of Polyaniline Micro/nano Structure and Its Composites,TB383.1
  2. Preparation of Superhydrophobic Coating and Study of Application,TQ171.68
  3. Influence of Surface Texture on Tribological Property of Piston Ring/Cylinder Tribopair,TH117.1
  4. Fabricating Polymer Superhydrophobic Surfaces by Replica-Molding Method Using CaCO3 Particles as Template,TB304
  5. Micro-Nanofabracation and Wettability of Zno Superhydrophobic Structures,TB383.1
  6. Experimental Study on Ruled Surface of Numerical Controlled Electrochemical Machining,TG662
  7. Research on Manufacture of Micro-hole by Electrochemical Process with High-speed Rotating Cathode,TG662
  8. Application of Click Chemistry in the Fabrication of Cactus-Like Hierarchical Particulates for Sticky Superhydrophobic Surfaces,TB383.1
  9. Maching Technological Study of Small Form Machined by Electro Jet Machining,TG662
  10. Simulation of Micro-Spiral Holes Machining by Electro-chemical Machining,TG662
  11. Research on the Technologies of Metal Electrochemical Fast Wire Cutting,TG662
  12. Research on the Manufacturing of Micro-pits by Electrolyte Jet Machining,TG662
  13. Experimental Research on Electrochemical Machining for Complex Shape Micro Holes,TG662
  14. The Research on the Electrochemical Micromachining(ECMM) with Nanosecond-Pulse Generator,TG662
  15. The Investigation of the Mechanism of High Frequency Short Pulse Micro-Electrochemical Machining,TG662
  16. Experimental Research of Pulses Electrochemical Machining for Micro Structure,TG662
  17. Micro Array-dimples Produced by Electrochemical Micro-machining on Surface,TG662
  18. Electrochemical Mechanical Finishing gear mechanism research and applied technology,TG662
  19. Studying on the Machining Technology of 3D Electrochemical Micromaching,TG661
  20. Polyaniline Graphics Processing Technology of Thin Film,TB383.2

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > The corrosion of various metals and alloys,corrosion and surface treatment
© 2012 www.DissertationTopic.Net  Mobile