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Relationship between the corrosion behavior and the thermal characteristics and microstructure of Mg-0.5Ca-Xzn alloys

Bakhsheshi-Rad, H. R. and Abdul Kadir, Mohammed Rafiq and Idris, Mohd. Hasbullah and Farahany, S. (2012) Relationship between the corrosion behavior and the thermal characteristics and microstructure of Mg-0.5Ca-Xzn alloys. Corrosion Science, 64 . pp. 184-197. ISSN 0010-938X

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Official URL: http://dx.doi.org/10.1016/j.corsci.2012.07.015

Abstract

Effects of secondary phases on corrosion behaviour of the Mg-0.5Ca-xZn alloys were investigated by polarization, immersion and hydrogen evolution tests. The Mg 2Ca phase nucleated at 520°C while, Ca 2Mg 6Zn 3 and Mg 51Zn 20 phases were formed at 420°C and 330°C respectively. The corrosion resistance of Mg-0.5Ca alloy was enhanced with the addition of Zn up to 1%, while further addition reversed the effect. The Mg-0.5Ca-1Zn alloys with (α-Mg+Ca 2Mg 6Zn 3+Mg 2Ca) phase showed lower corrosion rate than the alloys with (α-Mg+Ca 2Mg 6Zn 3) and (α-Mg+Ca 2Mg 6Zn 3+Mg 51Ca 20) phases. The amount of corrosion product, composed of Mg(OH) 2 and hydroxyapatite on the surface of the alloy, increased with increasing Zn content.

Item Type:Article
Additional Information:Indexed by Scopus
Uncontrolled Keywords:A. alloy, A. magnesium, B. polarization, B. SEM, B. weight loss
Subjects:Q Science
Divisions:Biosciences and Medical Engineering
ID Code:35815
Deposited By: Fazli Masari
Deposited On:04 Dec 2013 09:19
Last Modified:15 Feb 2017 08:28

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