Electropolishing of a Nickel–Titanium–Copper Shape Memory Alloy in Methanolic Sulfuric Acid

Drensler, Stefanie; Neelakantan, Lakshman; Somsen, Christoph; Eggeler, Gunther; Hassel, Achim Walter

doi:10.1149/1.3025889

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Voltammetry utilizing a rotating disk electrode (RDE) elucidated that the dissolution limiting current is controlled by mass transport and gave hints that the dissolved species are the rate determining species . Similar behavior was found for a ternary shape memory alloys of NiTiCu type and for NbTi . However, in the case of binary NiTi still a clear picture on the electro‐dissolution mechanism is elusive.…”

Section: Introductionmentioning

confidence: 78%

On the Electropolishing Mechanism of Nickel Titanium in Methanolic Sulfuric acid − An Electrochemical Impedance Study

Fushimi

Neelakantan

Eggeler

et al. 2018

Physica Status Solidi (a)

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Electropolishing of NiTi shape memory alloys is possible in methanolic 3 M H 2 SO 4 . The electro-dissolution behavior of NiTi in methanolic 3 M H 2 SO 4 is ascertained in terms of Nyquist plots using electrochemical impedance spectroscopy (EIS) under limiting current flow (mass transfer control) condition. The electro-dissolution 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 electro-dissolution under mass transfer condition follows a compact salt-film 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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Section: Introductionmentioning

confidence: 78%

On the Electropolishing Mechanism of Nickel Titanium in Methanolic Sulfuric acid − An Electrochemical Impedance Study

Fushimi

Neelakantan

Eggeler

et al. 2018

Physica Status Solidi (a)

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Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing

Nazneen

Galvin

Arrigan

et al. 2011

J Solid State Electrochem

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The purpose of this work is to investigate the electropolishing of medical-grade 316 L stainless steel to obtain a clean, smooth, and defect-free surface in preparation for surface nano-texturing. Electropolishing of steel was conducted under stationary conditions in four electrolyte mixtures: (A) 4.5 M H 2 SO 4 + 11 M H 3 PO 4 , (B) 7.2 M H 2 SO 4 + 6.5 M H 3 PO 4 , (C) 6.4 M glycerol + 6.1 M H 3 PO 4 , and (D) 6.1 M H 3 PO 4 . The influence of electrolyte composition and concentration, temperature, and electropolishing time, in conjunction with linear sweep voltammetry and chronoamperometry, on the stainless steel surface was studied. The resulting surfaces of unpolished and optimally polished stainless steel were characterized in terms of contamination, defects, topography, roughness, hydrophilicity, and chemical composition by optical and atomic force microscopies, contact angle goniometry, and X-ray photoelectron spectroscopy. It was found that the optimally polished surfaces were obtained with the following parameters: electrolyte mixture A at 2.1 V of applied potential at 80°C for 10 min. This corresponded to the diffusion-limited dissolution of the surface. The root mean square surface roughness of the electropolished surface achieved was 0.4 nm over 2×2 μm 2 . Surface analysis showed that electropolishing led to ultraclean surfaces with reduced roughness and contamination thickness and with Cr, P, S, Mo, Ni, and O enrichment compared to untreated surfaces.

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Review—Principles and Applications of Electrochemical Polishing

Xu,

Mao,

Ijaz

et al. 2024

J. Electrochem. Soc.

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Electrochemical machining (ECM) is an efficient and precise manufacturing technology with broad prospects for numerous applications. As a subset of electrochemical machining, electrochemical polishing (ECP) is an advanced surface finishing method that utilizes electrochemical principles to produce smooth and reflective surfaces on various materials, particularly metals. This process is distinguished by its ability to refine surfaces without causing scratches or other forms of mechanical damage, thereby providing a significant advantage over traditional mechanical polishing techniques. The high processing efficiency of ECP renders it particularly suitable for industries that demand large-scale production and high-quality surface finishes. This work reviews the fundamental aspects of ECP, comparing three mechanisms: viscous film theory, salt film theory, and enhanced oxidation–dissolution equilibrium theory. Furthermore, it examines the factors influencing the effectiveness of ECP, including electrolyte composition, temperature, electropolishing time, voltage, and current. Applications of ECP in stainless steel, copper, nickel, and tungsten are also explored, along with a summary of its integration with advanced technologies. Finally, perspectives on the future development of ECP are discussed.

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Electropolishing of a Nickel–Titanium–Copper Shape Memory Alloy in Methanolic Sulfuric Acid

Cited by 4 publications

References 15 publications

On the Electropolishing Mechanism of Nickel Titanium in Methanolic Sulfuric acid − An Electrochemical Impedance Study

On the Electropolishing Mechanism of Nickel Titanium in Methanolic Sulfuric acid − An Electrochemical Impedance Study

Electropolishing of medical-grade stainless steel in preparation for surface nano-texturing

Review—Principles and Applications of Electrochemical Polishing

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