In Situ Observation of Initial Corrosion of AZ91 Alloy with Residual Stress in Wet-Dry Conditions Using Environmental Scanning Electron Microscope

2007 ◽  
pp. 537-542
Author(s):  
Jian Chen ◽  
Jian Qiu Wang ◽  
En Hou Han ◽  
Wei Ke
Keyword(s):  
Residual Stress ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Environmental Scanning Electron Microscope ◽  
Az91 Alloy ◽  
Environmental Scanning ◽  
In Situ Observation ◽  
Dry Conditions ◽  
Scanning Electron

In Situ Observation of Initial Corrosion of AZ91 Alloy with Residual Stress in Wet-Dry Conditions Using Environmental Scanning Electron Microscope

2007 ◽  
Vol 546-549 ◽  
pp. 537-542 ◽  
Author(s):  
Jian Chen ◽  
Jian Qiu Wang ◽  
En Hou Han ◽  
Wei Ke
Keyword(s):  
Residual Stress ◽  
Electron Microscope ◽  
Corrosion Rate ◽  
Az91 Alloy ◽  
Environmental Scanning ◽  
Dry Conditions ◽  
Wetting Time ◽  
Average Corrosion Rate ◽  
Scanning Electron

The corrosion of AZ91 magnesium alloy with residual stress was observed in-situ in an atmosphere of water vapor with cyclic wet-dry conditions using environmental scanning electron microscope (ESEM). The results showed that the oxygen concentration on the surface generally increased with the wetting time. And the average corrosion rate of AZ91 alloy with residual stress (RS) was much larger than that without RS, indicating RS accelerated corrosion. The corrosion localized at primary α-Mg area at short wetting time, but with the increase of wetting time spread to the eutectic α-Mg region. Small-size as-cast defects (<50μm) contributed little to the average corrosion rate while large-size as-cast defects (>100μm) influenced the distribution of water film and corrosion on the surface.

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