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Corrosion of Hydrogen Storage Metal Alloy LaMm-Ni4.1Al0.3Mn0.4Co0.45 in the Aqueous Solutions of Alkali Metal Hydroxides

1
Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093 Warsaw, Poland
2
Centre of New Technologies, University of Warsaw, ul. Banacha 2c, 02-097 Warsaw, Poland
3
Industrial Chemistry Research Institute, ul. Rydygiera 8, 01-793 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Materials 2018, 11(12), 2423; https://doi.org/10.3390/ma11122423
Received: 15 October 2018 / Revised: 15 November 2018 / Accepted: 26 November 2018 / Published: 30 November 2018
(This article belongs to the Section Energy Materials)
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Abstract

Corrosion of pristine AB5-type metal alloy LaMm-Ni4.1Al0.3Mn0.4Co0.45 in the aqueous solutions of alkali metal hydroxides of diverse composition and concentration was tested. Correlation was observed between the alloy corrosion intensity in various hydroxide solutions, and its electrochemical capacity in these electrolytes. Mm(OH)3, CoO(OH), and nickel metal aggregates were detected among the products of selective oxidation of the alloy. High intensity corrosion of the alloy was observed in RbOH and CsOH solutions leading to formation of ternary oxides at the surface of the alloy. Presence of rubidium and cesium ions in the electrolyte were found to create an additional driving force for lanthanides (La and Ce) to leave the lattice of the alloy, thus, enhancing its corrosion. Corrosion, together with mechanical degradation, were found to be the main reasons of deactivation of LaMm-Ni4.1Al0.3Mn0.4Co0.45 alloy upon elongated electrochemical treatment. View Full-Text
Keywords: Ni-MH battery; AB5 alloy; hydrogen sorption; corrosion; limited volume electrode (LVE) Ni-MH battery; AB5 alloy; hydrogen sorption; corrosion; limited volume electrode (LVE)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Karwowska, M.; Fijalkowski, K.J.; Czerwiński, A.A. Corrosion of Hydrogen Storage Metal Alloy LaMm-Ni4.1Al0.3Mn0.4Co0.45 in the Aqueous Solutions of Alkali Metal Hydroxides. Materials 2018, 11, 2423.

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