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Title
On the Electropolishing Mechanism of Nickel Titanium in Methanolic Sulfuric acid : An Electrochemical Impedance Study
AuthorFushimi, Koji ; Neelakantan, Lakshman ; Eggeler, Gunther ; Hassel, Achim Walter
Published in
Physica Status Solidi (A), 2018, Vol. 215, Issue 15
PublishedWiley, 2018
LanguageEnglish
Document typeJournal Article
ISSN1862-6319
URNurn:nbn:at:at-ubl:3-631 Persistent Identifier (URN)
DOI10.1002/pssa.201800011 
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On the Electropolishing Mechanism of Nickel Titanium in Methanolic Sulfuric acid [0.68 mb]
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Abstract (English)

Electropolishing of NiTi shape memory alloys is possible in methanolic 3m H2SO4. The electrodissolution behavior of NiTi in methanolic 3m H2SO4 is ascertained in terms of Nyquist plots using electrochemical impedance spectroscopy (EIS) under limiting current flow (mass transfer control) condition. The electrodissolution behavior is studied under convective conditions using a rotating disc electrode. The influence of changes in rotation rate, applied potential, and temperature are determined. This study demonstrates that electrodissolution under mass transfer condition follows a compact saltfilm mechanism. In order to quantitatively characterize the salt film formed during electropolishing, EIS is performed under stationary conditions. The increase in applied voltage causes an increase in polarization resistance and decrease in capacitance of the interface film.

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CC-BY-NC-ND-License (4.0)Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License