Dissertation > Excellent graduate degree dissertation topics show

Investigation on Novel Anti-corrosive Coatings Based on Nanopolyaniline Additives

Author: HouWenPeng
Tutor: ZhaoWenYuan
School: Ocean University of China
Course: Materials Science
Keywords: Polyaniline nanoparticle coating EIS anticorrosion
CLC: TG174.4
Type: Master's thesis
Year: 2013
Downloads: 288
Quote: 0
Read: Download Dissertation

Abstract


Polyaniline （PANI） has attracted much attention due to their advantages of electrochemicalperformance, reversible redox properties and environment-friendly. Because of its specialproperties, PANI has shown enormous prospect in applications of anticorrosion. However, theapplication of polyaniline （PANI） is restricted by its poor solubility, infusible and almostnon-processable properties. Traditionally, PANI is commonly prepared by polymerization ofthe aniline monomer using （NH4）2S2O8as oxidant. Though with high conductivity, itsapplication is restricted by its poor solubility. This paper is focused on the polymerizationmethod of polyaniline and its application in the anticorrosion coatings. The main results are asfollows:Polyaniline nanoparticles with good dispersibility are synthesized by chemical oxidativepolymerization of aniline using H2O/FeCl2/H2O2as a novel, mild oxidizing system. Thestructure and morphology of the polyaniline was characterized by IR spectra and SEM.Different kinds of nano-polyanilines are prepared by using （NH4）2S2O8as oxidant and fourkinds of inorganic acids （hydrochloride, sulfuric acid, nitric acid, phosphoric acid）, three kindsof organic acids （dodecylbenzenesulfonic acid, benzenesulfonic acid, camphosulfonic acid） andperchloric acid as doped acid. Select as oxidant, nano-polyanilines are respectively prepared inphosphomolybdic acid and sulfuric acid solution, and undoped polyanilines are synthesizedwithout any acid. The dispersibility experiment indicates that nano-polyanilines prepared inFeCl2/H2O2system is much better than that of traditional polyaniline.The synthesized nano-polyaniline was dispersed in epoxy resin and composite coatings wereprepared by the simple mechanical polishing. Then the surface morphology of compositecoatings was studied and the adhesion strength was tested by scratching method. The corrosionprevention of composite coatings was investigated through the salt spray test, seawaterimmersion test and electrochemical method （Electrochemical impendance spectroscopy （EIS）technique and Tafel polarization test）. The results showed that the epoxy composite coatingmixed with nano-polyaniline prepared in FeCl2/H2O2system was provided with excellentprotective function and best adhesion strength for carbon steel, the anticorrosion performance of perchloric acid doped-polyaniline composite coating was worse than before, however, theepoxy composite coating mixed with inorganic acid, organic acid, doped-polyaniline displayedthe worst protective effect. Therefore, the polyaniline with good dispersibility usually had thebest anticorrosion performance.The anticorrosion performance of inorganic doped nano-polyaniline, nano-polyanilineprepared in FeCl2/H2O2system composite coatings and pure epoxy coating were comparedrespectively. Coating deterioration processes were researched by EIS method. EIS parametersin different immersing time were attained by using impedance models. The results obtainedshowed that nano-polyaniline can improve the anticorrosion performance of compositecoatings due to the effect of pinhole passivation. We supposed that once the better dispersibilityof nano-polyaniline, the pore of composite coating was much smaller, the passivation effectwas much better and the protect performance of composite coating was much excellent.

Related Dissertations

  1. Preparation of Micro-Arc Oxidation Ceramic Coating on Mg Alloy and the Research of Galvanic Corrosion,TG174.453
  2. Study of Inhibitors of Aluminum Anode in NaCl Solution,TG174.42
  3. A Study on the Electrodeposition of Zn-Co and Zn-Ni Alloys in the Reline Room Temperature Ionic Liquid,TQ153.1
  4. The Preparation of Polyaniline-Metal Complex and the Study on Its Catalytical Property,O634
  5. Preparation and Anticorrosion Properties of Doped Polyaniline/Epoxy Coating,TQ637
  6. Preparation and Performance of V2O5-WO3/MOx/Cordierite Catalyst Modified with Cu、Mn、Ce for DeNOx,X701
  7. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  8. Anti-corrosion Property of Flake Zinc Epoxy Coating Doped with Rare Earth in SRB,TQ630.1
  9. Research on PSA/Cotton Blend Fabric of Coatinging of Water Resistance and Moisture Permeability,TS195.6
  10. Research on Electrochemical Synthesis and Application of Conductive Polyaniline,O633.21
  11. Polyaniline / short fiber reinforced natural rubber properties,TQ330.1
  12. Molecular Probes Based on Gold Nanoparticle,TB383.1
  13. Preparation of α-Fe2O3/Ag Core/Shell Nanocomposites and SERS Properties,TB383.1
  14. The Surface Enhanced Raman Scattering from Coated Nanoparticles with Radial Anisotropy,TB383
  15. Synthesis and Application of the Bright Polyacrylate,TQ630.4
  16. Effect of Hydrophobic Modification of the Flame Retardant on the Properties of the Water-borne Intumescent Fire Retardant Coatings,TQ637
  17. Synthesis and Application of Biomedical Magnetic Nanoparticles,TB383.1
  18. Preparation of the Composite Coatings on the Carbon Steel Surface and Their Anticorrosion Properties in Seawater,TG174.4
  19. Study on Ni-based Tenacious Wear-resistance Gradient Coating In-situ Prepared by Laser on the Surface of Crystallizer Copper Alloy,TF777
  20. Optical Parametric Oscillator and Its Frequency Doubling to Achieve Three Primary Colors RGB Solid-state Lasers,TN248
  21. Preparation and Supershydrophobic Modification of TiO2 Nanotube Arrays and Research on Its Anticorrosion Propeties,TB383.1

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
© 2012 www.DissertationTopic.Net  Mobile