Abstract
Corrosion behavior of two multiphase Mg-Li-Al-based alloys in 0.6 M NaCl aqueous solution is investigated by hydrogen gas evolution measurement and electrochemical test. This paper reports, for the first time, the comparison of hydrogen evolution and Tafel extrapolation results of Mg-Li-Al-based alloys. The corrosion rate of Mg-9Li-7Al-1Sn is observed to be reasonably higher when compared to that of Mg-9Li-5Al-3Sn-1Zn, and both the alloys have shown higher corrosion rate than that of Mg-3Al-1Zn alloy (AZ31B). The micro-galvanic corrosion of primary precipitates and hcp α-phase (Mg-rich) is not as severe as was observed in case of the secondary precipitates and bcc β-phase (Li-rich). Corrosion mechanism of multiphase Mg-Li-Al-based alloys in chloride solution, which has not been adequately reported in the literature, is lucidly articulated based on the early stages of corrosion, film morphology, and in situ hydrogen bubble study.
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Acknowledgment
The authors acknowledge funding from IITK-ISRO cell Project No. MET /ISRO 20090011. VK thanks one of his Ph.D. supervisors Late Prof. R. Balasubramanaim (Professor, Department of Materials Science and Engineering at IIT Kanpur, India) for his help and guidance during the early design of the experiments. The authors would like to thank Mr. Govind (Scientist, ISRO; Trivanrdum, India) for his help during sample preparation.
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Kumar, V., Shekhar, R. & Balani, K. Corrosion Behavior of Novel Mg-9Li-7Al-1Sn and Mg-9Li-5Al-3Sn-1Zn Alloys in NaCl Aqueous Solution. J. of Materi Eng and Perform 24, 4060–4070 (2015). https://doi.org/10.1007/s11665-015-1687-7
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DOI: https://doi.org/10.1007/s11665-015-1687-7