Influence of rare earth Y on the corrosion behavior of as-cast AZ91 alloy |
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Authors: | T.J. Luo Y.S. Yang Y.J. Li X.G. Dong |
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Affiliation: | aInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract: | The influence of different contents of rare earth Y on the corrosion resistance of AZ91 alloy was investigated by the salt spray test and electrochemical measurements. It was found that the proper amount of Y was effective on improving the corrosion resistance of AZ91 alloy. The optimal modification effect was obtained when the Y content in the alloys was 0.3 wt.%. However, with the increase of rare earth Y, the corrosion rate became bigger slightly, and further addition of Y content over 0.3 wt.% resulted in the increment of the corrosion rate. It is suggested that the excessive rare earth Y can reduce the corrosion resistance of AZ91 alloy. |
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Keywords: | Magnesium alloy Corrosion Corrosion rate Polarization curve Electrochemical impedance spectroscopy |
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