Journal
APPLIED SURFACE SCIENCE
Volume 259, Issue -, Pages 816-823Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2012.07.130
Keywords
AZ91D; Magnesium alloy; Chemical conversion coating; Zn content; Corrosion
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Funding
- National Science Foundation of China [50975190]
- Shanxi Province Science Foundation for Youths [2011021022-3]
- National Natural Science Foundation of China [51101111]
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In this study, four AZ91D magnesium plates with different Zn content were treated with chemical conversion treatments. The chemical conversion coating was examined using scanning electron microscope, optical microscope and glow discharge optical emission spectrometer. The testing results indicated that increase in Zn content produced a thicker chemical conversion coating. However, when the Zn content exceeded 2 wt.%, the thickness of the chemical conversion coating decreased. To investigate the chemical conversion mechanism, potentiodynamic polarization and electrochemical impedance spectroscopy were employed to evaluate the corrosion resistance of the magnesium substrate in 3.5 wt.% NaCl solution. (C) 2012 Published by Elsevier B.V.
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