Effect of Trace Zn on Corrosion Resistance Property of AM60-2%RE Magnesium Alloy

The microstructure and corrosion properties of AM60-2%RE magnesium alloys with the addition of trace Zn were investigated by X-ray diffractometer(XRD), scanning electron microscope(SEM), polarization curve and electrochemical impedance spectroscopy. The results show that the Zn element added is main...

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Published inCai liao gong cheng = Journal of materials engineering Vol. 44; no. 2; pp. 17 - 22
Main Authors Liu, Yang, Liu, Zi-li, Liu, Xi-qin, Chen, Hong-jun, Li, Jian
Format Journal Article
LanguageChinese
Published 20.02.2016
Subjects
Alloys
Corrosion
Corrosion products
Corrosion resistance
Current density
Electrochemical impedance spectroscopy
Magnesium base alloys
Zinc base alloys
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Summary:The microstructure and corrosion properties of AM60-2%RE magnesium alloys with the addition of trace Zn were investigated by X-ray diffractometer(XRD), scanning electron microscope(SEM), polarization curve and electrochemical impedance spectroscopy. The results show that the Zn element added is mainly solution distributed in the matrix, without forming new intermediate phase with the other elements; while, the amount of phase Al sub(11) RE sub(3) increases obviously, and is distributed intermittently on the grain boundary. With the increase of Zn content, the corrosion current density of the alloys is reduced, the charge transfer resistance increases and the compactness of corrosion products is improved, leading to obviously improved corrosion resistance. The corrosion rate is 0.405mg[middot]cm super(-2)[middot]d super(-1) for the alloy with 0.8% Zn addition, which is lowered to 36% that of the alloy with 0.2% Zn addition.
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ISSN:1001-4381
DOI:10.11868/j.issn.1001-4381.2016.02.003