Dissertation > Excellent graduate degree dissertation topics show

The Research on Testing for Corrosion Behavior and Passivation of Hot-dip Galvanized Steel

Author: ZhongHui
Tutor: HeShiQuan
School: Lanzhou University of Technology
Course: Chemical Process Equipment
Keywords: hot-dip galvanize corrosion passivation molybdate acrylic resin
CLC: TG174.4
Type: Master's thesis
Year: 2011
Downloads: 108
Quote: 0
Read: Download Dissertation

Abstract


Hot-dip galvanized steel widely apply for domestic construction. The study of corrosion behaviour of hot-dip galvanized steel can deduce the mechanism of corrosion, and optimize the method of corrosion control. Corrosion behaviour of hot-dip galvanized steel in 5% NaCl aqueous solution was studied by electrochemical impedance spectrum techniques, and scanning electron microscope was used to observe the morphology of the hot-dip galvanized steel. The results revealed that Corrosion behaviour of hot-dip galvanized steel has a great relationship with corrosion produts. With the increase of immersion time, corrosion products are constantly changing, and the impedance of corrosion products are different. Parameters fitted by equivalent circuit show that the impedance of corrosion products increased at first, then decreased.A new technological design of free-chromated passivation has been studied. A series of tests was been taken to select the best experimental procedure parameter, such as bath temperature, dipping time, solution’s pH and solution’s concentration.Electrochemical behavior of the molybdate and acrylic composite passivation film in 3.5%NaCl solution was studied by polarization curve and electrochemical impedance spectrum( EIS) techniques. Anti-corrosion performance was tested by 48 hours salt spray test and salt water immersion method. Scanning electron microscope( SEM) was used to observe the morphology of the original film. Compared with unpassivated hot-dip galvanized steel and chromate passivated hot-dip galvanized steel, it was found that anti-corrosion performance of the molybdate and acrylic composite passivation film is better.

Related Dissertations

  1. Preparation of Micro-Arc Oxidation Ceramic Coating on Mg Alloy and the Research of Galvanic Corrosion,TG174.453
  2. Anti-corrosion Property of Flake Zinc Epoxy Coating Doped with Rare Earth in SRB,TQ630.1
  3. Temperature and Pressure Drop Analysis and Its Application in CO2 Corrosion Evaluation of Subsea Pipeline,TE832
  4. Study on Screening of Bacterial Quorum Sensing from Plant Extraction and Their Inhibitions on Biofilm Formation,Q93
  5. Research on Electrochemical Synthesis and Application of Conductive Polyaniline,O633.21
  6. Research on Caster Oil-based Cold Rolling Oil,TE666
  7. Influence of Various PH and the Treating Time on Mechanical Property and Surface Structure of Ni-ti Orthodontic Wire,R783.5
  8. Synthesis and Properties of Rare Earth Red-emitting Phosphors for White LED,O482.31
  9. Electroless Ni-Pon the Bulk Nanocrystalline Ingot Iron,TQ153.1
  10. Synthesis and properties of self-cross -linked acrylic resin,TQ325
  11. Synthesis and Application of Alkali Soluble Acrylic-Styrene Resin,TQ320.6
  12. Failure Analysis on Superheat Section Connecting Pipe Flange of Ethylene Cracking Furnace,TQ221.211
  13. Study on the Silicone Modified Acrylic and Water-borne Anti-corrosion Coatings,TQ637
  14. Study on Corrosion Resistance and Condensation Property of Ni-P/Nano SiO2 Composite Coatings,TG174.4
  15. Study on Process of RE-boronizing for Q235 Steel and Boride Layer Anti-corosion Property in Aluminum Melt,TG156.87
  16. Study of the Effect of High Voltage Transmission Lines on Buried Metal Pipeline Corrosion,TE988
  17. Study of Microbial Corrosion in Central Air-conditioning Cooling Water System,TU831.4
  18. Preparation, Characterization and Performance of the Bio-coatings on the Surface of Pure Titanium Based on Micro Arc Oxidation,R318.08
  19. 2205 Corrosion Research,TG142.71
  20. 316LN austenitic stainless steel stress corrosion cracking of welded joints,TG407
  21. Investigation on Flow Accelerated Corrosion of Carbon Steels for Pwr Secondary Piping,TL334

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