Dissertation > Excellent graduate degree dissertation topics show

Study on Anodic Oxidation Technology and Corrosion Resistance of Aluminum Silicon Alloy

Author: LiuYingXin
Tutor: NiuDun
School: Northeastern University
Course: Applied Chemistry
Keywords: aluminum silicon alloy anodic oxidation corrosion resistance electrochemical test
CLC: TG174
Type: Master's thesis
Year: 2008
Downloads: 113
Quote: 1
Read: Download Dissertation

Abstract


Aluminum silicon alloy has many excellent performances, such as smaller density, higher intensity. The corrosion sensitivity of alloy will be beincreased by adding silicon and magnesium. The alloy will be eroded at atmosphere environment. In this paper, the sulfuric acid anodic oxidation has been selected. The process of surface pretreatment is optimized according to studying the effects of degreasing, alkaline cleaning, desmutting on the film mass. Based on the anode oxidation mechanism, the effects of craft parameters, electrolyte concentration, electrolyte temperature, oxidation current density, oxidized time, additive and post-sealing treatment on the oxide film’s quality was discussed. The corrosion resistance of oxide film was qualitative analysed by mensurating AC impedance chart and polarization curve. Considering the ornament performance and corrosion resistance of oxide film, the optimal craft parameter could be obtained ultimately.The morphology, component, microstructure of anodic oxide films are characterized by SEM, XRD and EDS. The results showed that the anodic film is composed of amorphous alumina and has compact and homogeneous surface. Potassium dichromate dropping test, sodium hydroxide dropping test and 240 hour’s neutral salt spray fogtest (NSS) were applied to anodic oxide film, the results indicate that the films which are prepared under the optimum oxidization process conditions were of the resistance to acid, alkali and salt. Electrochemical behavior of anodic oxide films in NaCl solution was studied by means of electrochemical impedance spectroscopy (EIS) and polarization curves. The results revealed that the film after sealing has the better corrosion resistance and the film’s corrosion resistance is relative to the chloride concentration of the NaCl solution.

Related Dissertations

  1. Research on Electrochemical Synthesis and Application of Conductive Polyaniline,O633.21
  2. Electroless Ni-Pon the Bulk Nanocrystalline Ingot Iron,TQ153.1
  3. Study on Corrosion Resistance and Condensation Property of Ni-P/Nano SiO2 Composite Coatings,TG174.4
  4. The Study on Red Soil Corrosion by the Technological Direct, Continuous Monitoring,X53
  5. Organizations and alloying elements on the corrosion resistance of high-performance steel for railway vehicles,TG142.13
  6. Study of the Effect of Aluminum Powders Activant on Mechanically Deposited Process of Zinc-aluminum Alloy,TG174.44
  7. Tribological Properties and Corrosion Resistance to Molten Steel of （ZrB2-ZrO2）/BN Composites,TB332
  8. The in situ SiC resistance to oxidation and corrosion resistance studies with corundum -based materials,TQ175.1
  9. TiO_2 nanotube , Modification and Application,O614.411
  10. Hydroxyapatite Coating Prepared on Porous Titanium Substrate by Sol-gel,R318.08
  11. Research on Thermal Spraying Ni/Al Coating on the Surface of AZ91D Magnesium Alloy,TG174.44
  12. Titanium - aluminum alloy electrodeposition in ionic liquid,TG146.23
  13. Composite modification of AZ91 magnesium alloy surface structure and corrosion resistance,TG174.44
  14. Effects of Electrical Parameters on Microstructure and Corrosion Resistance of Micro-arc Oxidation Coating on AZ91D Magnesium Alloys under Different Power Supply,TG174.4
  15. Study on the Ceramic-metal Composite Coatings on the Surface of Carbon Steel by Laser Cladding,TG174.44
  16. Investigation on Corrosion Resistance of Micro-Arc Oxidation Coating on Al18B4O33w/6061 Composite,TG174.45
  17. Research on the Corrosion Mechanism of Ceramic Composite Coating in Molten Zinc,TG174.4
  18. Research on Ni-P-Al2O3 Electroless Composite Coating on AZ91D Magnesium Alloy,TG174.44
  19. A Study on Technique and Property of Anodic Oxidation on Biomedical Pure Titanium,TG174.44
  20. Effect of Annealing Treatment on Electronic Work Function and the Related Properties of Bulk Metallic Glass,TG139.8

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection
© 2012 www.DissertationTopic.Net  Mobile