Electrochemical corrosion evaluation of new Zn-Sn-In coatings electrodeposited in a eutectic mixture containing choline chloride and ethylene glycol

•Ternary Zn-Sn-In alloy were successfully deposited in eutectic solution.•The increase of In concentration in electrodeposition baths also increased their corrosion resistance and grain refinement.•Impedance spectroscopy data showed that Zn-Sn-In alloys presented a capacitor-like behaviour and incre...

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Bibliographic Details
Published in:Electrochimica acta 2022-03, Vol.407, p.139647, Article 139647
Main Authors: Pereira, Juliermes C., dos Santos, Luis P.M., Alcanfor, Ana A.C., Campos, Othon S., Casciano, Paulo N.S., Correia, Adriana N., de Lima-Neto, P.
Format: Article
Language:English
Subjects:
Carbon steels
Choline
Coated electrodes
Corrosion
Corrosion resistance
Corrosion tests
Electrochemical corrosion
Electrodeposition
Ethylene glycol
Eutectic solvents
Grain size
Indium
Intermetallic phases
Neutral medium
Photomicrographs
Protective coatings
Substrates
Zinc base alloys
Zinc coatings
Zn-Sn-In
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Summary:•Ternary Zn-Sn-In alloy were successfully deposited in eutectic solution.•The increase of In concentration in electrodeposition baths also increased their corrosion resistance and grain refinement.•Impedance spectroscopy data showed that Zn-Sn-In alloys presented a capacitor-like behaviour and increased anticorrosion efficiency towards 1020 steel electrode. Ternary Zn-Sn-In coatings were successfully electrodeposited for the first time on 1020 carbon steel substrates from a choline chloride and ethylene glycol base bath to improve the corrosion resistance of Zn-Sn alloys. The micrographs of the coatings revealed that increasing the concentration of indium (In) in the alloy reduced the grain size, and the electrodeposition performed at –1.3 V produced denser and more compact coatings rich in Zn. The diffractograms showed the deposition of metallic Zn, Sn, and In, as well as the presence of an In-Sn4 intermetallic phase. The electrochemical corrosion tests in 3.5% NaCl solution showed that the addition of indium in the Zn-Sn coatings increased the corrosion resistance of the protective layer, with the Zn64Sn23In13 coating, electrodeposited at –1.3 V, showing corrosion resistance superior to the other investigated coatings.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.139647