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Solubility effects of Sn and Ga on the microstructure and corrosion behavior of Al-Mg-Sn-Ga alloy anodes
M. Srinivas, Srinivas Kumar Adapaka,
Published in Elsevier Ltd
2016
Volume: 683
   
Pages: 647 - 653
Abstract
The microstructure and corrosion behavior of Al-0.5Mg-0.08Sn-0.08Ga (wt%) anode material solutionized at different temperatures ranging from 400 to 550 °C is studied. Thermal analysis reveals that Sn is soluble in the Al alloy in this temperature range. Microstructural observation shows maximum solubility of Sn above 450 °C. Electrochemical investigations in 3.5 wt% NaCl and 9 M NaOH solution reveals lower corrosion and hydrogen evolution rates for the specimen solutionized at 450 °C. Though Sn is soluble above 450 °C, the corrosion slightly increases at higher solutionizing temperatures due to the segregation Ga at the surface. The corrosion and hydrogen evolution rate are higher when Sn is present as precipitate and causes localized (pitting) type of corrosion. On the contrary, presence of Sn in solid solution improves the corrosion resistance and decreases the hydrogen evolution rate. Hence, it can be concluded that the presence of Sn in solid solution is essential for reducing the corrosion rate and the distribution of the Sn plays a major role in the corrosion behavior of Al-Mg-Sn-Ga alloys. © 2016 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Alloys and Compounds
PublisherData powered by TypesetElsevier Ltd
ISSN09258388
Open AccessNo
Concepts (26)
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    Aluminum
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    Aluminum alloys
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    Anodes
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    Corrosion
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    Corrosion rate
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    Corrosion resistance
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    Corrosive effects
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    Electrodes
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    Gallium
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    Gallium alloys
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    Hydrogen
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    Microstructure
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    Solid solutions
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    Solubility
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    Surface segregation
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    Thermoanalysis
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    Tin
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    AS PRECIPITATES
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    Corrosion behavior
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    Electrochemical impedance
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    Electrochemical investigations
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    HYDROGEN EVOLUTION RATE
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    HYDROGEN OVER POTENTIALS
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    Micro-structural observations
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    Temperature range
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    Tin alloys