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Effect of Grain Size and Secondary Particle Refinement on Corrosion Behavior of Cross-rolled Mg–Li–Ca Alloy

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Abstract

Corrosion behavior of cross (cold- and cryo-rolled) Mg–10Li–1.5Ca in 0.6 M NaCl was investigated. Cross-rolling was carried out to reduce the thickness to 50% at room temperature. Scanning electron microscopy study was conducted to understand structural transformation. The potentiodynamic polarization test was performed in 0.6 M NaCl solution to investigate the corrosion mechanism. The results show that cryo-rolled Mg alloy exhibits superior corrosion resistance than the cold-rolled and as-received alloy due to the extreme grain refinement of α-Mg phase and fine homogeneous distribution of intermetallic (Mg2Ca) compounds along the phase boundaries. The different corrosion products such as magnesium hydroxide and lithium hydroxide are formed over the surface. The uniform dense corrosion product Mg(OH)2 passivates corrosion of Mg–Li–Ca alloy, thereby improving the corrosion resistance of the alloy.

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Acknowledgements

I would like to thank the Director, NIT, Tiruchirappalli, for providing the research assistantship.

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Authors and Affiliations

  1. Green Energy Materials and Manufacturing Research Group, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu, 620015, India

    D. Dhamodharan, P. Bhagat Singh & S. Kumaran

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  1. D. Dhamodharan
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  2. P. Bhagat Singh
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  3. S. Kumaran
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Correspondence to S. Kumaran.

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Dhamodharan, D., Bhagat Singh, P. & Kumaran, S. Effect of Grain Size and Secondary Particle Refinement on Corrosion Behavior of Cross-rolled Mg–Li–Ca Alloy. Trans Indian Inst Met 72, 1631–1634 (2019). https://doi.org/10.1007/s12666-019-01721-0

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  • DOI: https://doi.org/10.1007/s12666-019-01721-0

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