Reduction of impurity contents in aluminum plates electrodeposited from a dimethylsulfone-aluminum chloride bath

High productivity and bath stability of electrodeposition for Al and its alloys from a dimethylsulfone (DMSO2)-aluminum chloride bath are highly desirable characteristics for a wide range of critical applications. However, a long-standing problem for such electrodeposits is S and Cl contamination, w...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-04, Vol.783, p.919-926
Main Authors: Kuma, Chisaki, Sato, Kana, Hanaoka, Yudai, Matsui, Isao, Takigawa, Yorinobu, Uesugi, Tokuteru, Higashi, Kenji
Format: Article
Language:English
Subjects:
Aluminum
Aluminum base alloys
Aluminum chloride
Chloride
Dimethylsulfone-aluminum chloride
Ductility
Electrodeposition
Elongation
First principles
Gallium base alloys
Gallium chloride
Grain boundaries
Impurities
Mechanical properties
Reduction
Tensile tests
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Summary:High productivity and bath stability of electrodeposition for Al and its alloys from a dimethylsulfone (DMSO2)-aluminum chloride bath are highly desirable characteristics for a wide range of critical applications. However, a long-standing problem for such electrodeposits is S and Cl contamination, which results in limited ductility. In this study, we explored a reduction method for S and Cl in Al electrodeposits from a DMSO2 bath to facilitate plastic elongation of the electrodeposited Al. For 2–5:10 M ratios of aluminum chloride to DMSO2, tailoring the conditions of electrodeposition decreased the S and Cl contents to ∼0.2 at%. The addition of various metal salts revealed that gallium chloride further reduced the S and Cl contents to less than 0.1 at%. This reduction permitted the electrodeposited Al–Ga alloys to exhibit plastic elongation in tensile tests. Based on the results of experiments and first-principles calculations, we discuss the role of Ga in the growth mode of electrodeposits and its effect on grain boundary cohesion. Thus, we elucidate the mechanisms for realizing high strength and ductility in electrodeposited Al alloys. •Al electrodeposition from a DMSO2-based bath was conducted.•Adjusting deposition conditions reduced the total contents of S and Cl to ∼0.4 at%.•The addition of GaCl3 reduced the total S and Cl contents to less than 0.1 at%.•Electrodeposited Al-Ga alloys exhibited plastic elongation in tensile tests.•The role of Ga in growth modes and its effects on GB cohesion were discussed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.12.355