Effect of combinative addition of strontium and rare earth elements on corrosion resistance of AZ91D magnesium alloy

The influencf of strontium（Sr） and rare earth（RE） elements on the corrosion behavior of AZ91D magnesium alloy was investigated by conventional corrosion testing and electrochemical measurements in 3.5% NaCl solution. After comparing the mass loss and hydrogen evolution of the samples, the microstruc...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2008-10, Vol.18 (5), p.1058-1064
Main Author: 钮洁欣 陈秋荣 徐乃欣 卫中领
Format: Article
Language:English
Subjects:
AZ91D alloy
AZ91D合金
corrosion
microstructure
rare earth elements
strontium
微结构
稀土元素
腐蚀作用
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Summary:The influencf of strontium（Sr） and rare earth（RE） elements on the corrosion behavior of AZ91D magnesium alloy was investigated by conventional corrosion testing and electrochemical measurements in 3.5% NaCl solution. After comparing the mass loss and hydrogen evolution of the samples, the microstructures of the alloys and the morphologies of their corrosion product films were characterized by electron probe microanalysis-energy dispersive spectrometry（EPMA-EDS） and Auger electron spectroscopy（AES）. Compared with individual addition of Sr or RE to AZ91D, the combinative addition of 0.5% Sr and 1% RE to AZ91D successfully decreases the corrosion rate further, which can be attributed to the depression of micro-galvanic couples, as well as the formation of more protective film due to aluminum enrichment. The combinative addition of strontium and rare earth elements to AZ91D magnesium alloy appears to be a promising approach to increase its corrosion resistance.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60181-8