Correlation of Microstructure and Electrochemical Corrosion Behavior of Squeeze-Cast Ca and Sb Added AZ91 Mg Alloys

The effect of individual and mixed additions of calcium (Ca) and antimony (Sb) on the corrosion behavior of the squeeze-cast AZ91 alloy have been investigated. The corrosion resistance of all modified alloys is better as a result of the refined and reduced volume fraction of the β-Mg 17 Al 12 phase...

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Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-10, Vol.48 (10), p.5106-5121
Main Authors: Bankoti, A. K. S., Mondal, A. K., Perugu, Chandra S., Ray, B. C., Kumar, S.
Format: Article
Language:English
Subjects:
Alloying additive
Antimony
Calcium
Characterization and Evaluation of Materials
Chemistry and Materials Science
Concentration (composition)
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Electrochemical corrosion
Grain refinement
Magnesium base alloys
Materials Science
Metallic Materials
Metallurgy
Microstructure
Nanotechnology
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:The effect of individual and mixed additions of calcium (Ca) and antimony (Sb) on the corrosion behavior of the squeeze-cast AZ91 alloy have been investigated. The corrosion resistance of all modified alloys is better as a result of the refined and reduced volume fraction of the β-Mg 17 Al 12 phase as well as grain refinement. Individual additions are better than mixed additions. The AZ91-1.0Ca (AZX911) alloy comprising individual Ca addition with a continuous network of the Al 2 Ca phase reveals the lowest corrosion rate. Among the alloys comprising combined additions, the AZ91-2.0Ca-0.3Sb (AZXY9120) alloy exhibits the best corrosion resistance because of the higher and lower volume fractions of the Al 2 Ca and Ca 2 Sb phases, respectively.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-017-4244-1