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Corrosion Behavior of Anodic Oxidation Titanium Dioxide Film in Seawater

Author: WangMin
Tutor: WangZuo
School: Ocean University of China
Course: Materials Science
Keywords: Anodic oxidation method The oxide film of titanium dioxide Corrosion Hydrophobic properties Electrochemical techniques
CLC: TG174.4
Type: Master's thesis
Year: 2010
Downloads: 112
Quote: 0
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Abstract


Associated with the development of the productive forces and the progress of science and technology, marine and human relations have become increasingly close, and at the same time, a large number of metal materials to be used in marine science and technology research and engineering development projects. However, due to the high salinity of the sea water and marine climate led to a very serious corrosion of metal materials in the ocean. How to prepare a new type of marine material to prevent metal corrosion in seawater has become of the important issues of national research institutions. In this paper, prepared by anodic oxidation the the titania oxide film based on detected by its own nature, and their preparation of composite material, designed to study the corrosion resistance to seawater corrosion-resistant film, slow the occurrence of surface corrosion of the material in combination with polymer material , explore and come up with a way to apply to the marine environment corrosion-resistant materials. First, we use the sulfuric acid as an electrolyte, and to constant-voltage anodizing in the titanium substrate, the oxide film of titanium dioxide was prepared by XRD to characterize the structure of the oxide film prepared under different conditions, using the contact angle measuring instrument and the testing methods such as scanning electron microscopy hydrophobic and hydrophilic surface structure of the titania oxide film; using electrochemical impedance spectroscopy (EIS), polarization curves for corrosion resistance analysis. Experimental results show that the titania oxide film prepared by anodic oxidation has good resistance to seawater corrosion, while under dark conditions titania-specific hydrophobic properties further increases the corrosion resistance of the oxide film. Second, we use the potentiostatic method the prepared titania oxide film the polymerization layer of polyaniline film. Using SEM, surface morphology and hydrophobic properties of the contact angle measurement detection polyaniline; using electrochemical impedance spectroscopy (EIS), polarization curves, electrochemical test method for corrosion resistance testing. The experimental results show that in weakly alkaline seawater, polyaniline restoring unit dedoping to generate oxidation state polyaniline full oxidation state polyaniline has excellent resistance to sea water permeation and corrosion resistance, and thus effectively increase the internal metal protection, a significant role in reducing the rate of corrosion of the metal. Third, we use polystyrene spheres as the surface modification of materials, has generated a good oxide film of titanium dioxide nanotubes prepared polystyrene spheres / titania nanotubes composite membrane using the contact angle measurement and electrochemical impedance, polarization curve test method to test its hydrophobicity and resistance to seawater corrosion. The experimental results show that the surface of the oxide film modified by the hydrophobic material can effectively prevent the penetration of water inside the membrane to the oxidation, thus reducing the seawater corrosion oxide film.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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