Paper Title:
Microstructure and Corrosion Resistance Behavior of Composite Micro-Arc Oxidation and Sio2 Coatings on Magnesium Alloys
  Abstract

SiO2 sol sealing agent was developed by hydrolyzing of organic alkoxide, and protective composite coatings were obtained on magnesium alloys AZ31B by micro-arc oxidation (MAO) treatment plus a top coating with sealing agent using dipping-costing technique. SEM observations revealed that SiO2 sol immersed into pores and uniformly covered the surface of MAO coating. XPS analysis indicated that an inorganic SiO2 layer has formed on the surface of MAO coating. The results of potentiodynamic polarization tests showed that corrosion resistance of AZ31B alloys with composite coatings was evidently superior to that of merely MAO coating. The SiO2 layer provided corrosion protection by physically sealing the pores on the MAO coating and acting as a barrier. The composite coatings could suppress the corrosion process by preventing the transferring or diffusing of corrosive ions between magnesium alloys substrate and solution.

  Info
Periodical
Advanced Materials Research (Volumes 160-162)
Edited by
Guojun Zhang and Jessica Xu
Pages
1834-1838
DOI
10.4028/www.scientific.net/AMR.160-162.1834
Citation
Y. F. Ge, B. L. Jiang, Z. Y. Yang, Y. L. Li, "Microstructure and Corrosion Resistance Behavior of Composite Micro-Arc Oxidation and Sio2 Coatings on Magnesium Alloys", Advanced Materials Research, Vols. 160-162, pp. 1834-1838, 2011
Online since
November 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: N. R. Ha, Z. X. Yang, Kyu Hong Hwang, J. K. Lee
Abstract:Pure Titanium alloys are superiorities of biocompatibility, mechanical properties and chemical stability. The biocompatibility of Ti alloy...
177
Authors: Ping Yi Guo, Ning Wang, Peng Fan
Chapter 1: Traditional Building Materials
Abstract:Ceramic oxide coatings were produced on pure titanium by plasma electrolytic oxidation in different electrolytes. The variation of coating...
596
Authors: Yan Bo Wu, Xiao Xi Wang, Ting Lou, Tie Ben Song
Chapter 9: Energy Chemical Engineering
Abstract:SnSO4 and TiOSO4 were chosen in this paper as the main salts for preparing composite chemical conversion coating on aluminum alloy. The scope...
2191
Authors: Shi Gang Xin, Jun Le, Li Xin Song
Abstract:This paper studies the influence of current frequency on the micro-arc oxidation (MAO) process, microstructrue and the properties of the...
76
Authors: Shun Qi Zheng, Xiao Jing Li, Li Ping Zhu, Yun Chen, Jian Min Luo
Chapter 1: Alloy and Nanometer Materials
Abstract:Micro-arc oxidation (MAO) coatings were synthesized on MB3 magnesium alloy substrate. Two different electrolyte (Ⅰ) and electrolyte (Ⅱ) were...
54