Electrochemical micromachining of ZrCu-based amorphous alloy in ethylene glycol solution

Hang, Yusen; Yang, Tao; Xu, Zhiheng; Zeng, Yongbin

doi:10.1016/j.intermet.2021.107155

Cited by 9 publications

(5 citation statements)

References 31 publications

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“…Moreover, the loop’s radius of Cu

was larger than that of Cu

, which indicated a more protective air-formed film on Cu

. As corrosion time prolonged, both Cu

/Cu

SCs obtained a straight line in low frequency [ 19 , 40 ]. As it is known, the straight line was usually defined as the Warburg impedance, which is attributed to the mass transport in the corrosion reaction [ 41 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

“…Through the above analysis, anisotropic corrosion varied in different stages. Moreover, electrochemical impedance spectroscopy (EIS) is a powerful tool in the investigation of corrosion behavior that not only provides a non-destructive assessment of the corrosion rate but also enables the determination of the corrosion mechanism [ 18 , 19 ]. EIS can separate the diffusion processes from other physico-chemical processes in a wide frequency spectrum, which has served as a powerful and routine tool in estimating the diffusion coefficient [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Impedance Spectroscopy (EIS) Explanation of Single Crystal Cu(100)/Cu(111) in Different Corrosion Stages

et al. 2023

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Copper and its alloys are used widely in marine environments, and anisotropic corrosion influences the corrosion kinetics of copper. Corrosion of copper in an electrolyte containing Cl− is described as a dissolution–deposition process, which is a prolonged process. Therefore, it is laborious to clarify the corrosion anisotropy in different stages. In this paper, electrochemical impedance spectroscopy (EIS) following elapsed open circuit potential (OCP) test with 0 h (0H), 24 h (24H) and 10 days (10D) was adopted. To exclude interruptions such as grain boundary and neighbor effect, single crystal (SC) Cu(100) and Cu(111) were employed. After 10D OCP, cross-sectional slices were cut and picked up by a focused ion beam (FIB). The results showed that the deposited oxide was Cu2O and Cu(100)/Cu(111) experienced different corrosion behaviors. In general, Cu(100) showed more excellent corrosion resistance. Combined with equivalent electrical circuit (EEC) diagrams, the corrosion mechanism of Cu(100)/Cu(111) in different stages was proposed. In the initial stage, a smaller capacitive loop of Cu(111) suggested preferential adsorption of Cl− on air-formed oxide film on Cu(111). Deposited oxide and exposed bare metals also played an important role in corrosion resistance. Rectangle indentations and pyramidal structures formed on Cu(100)/Cu(111), respectively. Finally, a perfect interface on Cu(100) explained the tremendous capacitive loop and higher impedance (14,274 Ω·cm2). Moreover, defects in the oxides on Cu(111) provided channels for the penetration of electrolyte, leading to a lower impedance (9423 Ω·cm2) after 10D corrosion.

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“…Moreover, the loop’s radius of Cu

was larger than that of Cu

, which indicated a more protective air-formed film on Cu

. As corrosion time prolonged, both Cu

/Cu

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical Impedance Spectroscopy (EIS) Explanation of Single Crystal Cu(100)/Cu(111) in Different Corrosion Stages

et al. 2023

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show abstract

“…Afterwards, they further carried out the experimentation studies on micromachining amorphous alloys using the micro-rod/wire-shaped tool electrodes. In the past decade, Zeng and Meng et al [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ] have carried out a series of studies on fabricating amorphous alloy microstructures by using electrochemical wire cutting and successfully achieved several complex precision microstructures such as microgear and micro-cantilever arrays [ 32 , 39 ]. However, electrochemical wire cutting can only be used to fabricate perforated microstructures such as slits and holes and externally complex-shaped structures by following a designed trajectory, and it is difficult to machine blind holes, grooves and cavities, and three-dimensional complex structures and parts.…”

Section: Introductionmentioning

confidence: 99%

Microfabricating Mirror-like Surface Precision Micro-Sized Amorphous Alloy Structures Using Jet-ECM Process

Han,

Ming,

Niu

et al. 2024

Micromachines

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Amorphous alloy (AA) is a high-performance metal material generally with significantly excellent mechanical and corrosion resistance properties and thus is considered as a desirable material selection for micro-scale articles. However, the microfabrication of AA still faces a variety of technical challenges mainly because the materials are too hard to process and easily lose their original properties, although at moderately high temperatures. In this study, jet-electrolyte electrochemical machining (Jet-ECM) was proposed to microfabricate the Zr-based AA because it is a low-temperature material-removal process based on the anode dissolution mechanism. The electrochemical dissolution characteristics and material removal mechanism of AA were investigated, and then the optimal process parameters were achieved based on the evaluation of the surface morphologies, surface roughness, geometrical profile, and machining accuracy of the machined micro-dimples. Finally, the feasibility was further studied by using Jet-ECM to fabricate arrayed micro-dimples using the optimized parameters. It was found that Jet-ECM can successfully microfabricate mirror-like surface AA arrayed precision micro-dimples with significantly high dimensional accuracy and geometrical consistency. Jet-ECM is a promisingly advantageous microfabrication process for the hard-to-machine AA.

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“…Based on the principle of electrochemical anode dissolution, wire electrochemical micromachining (WECMM) uses a microscale wire as the tool cathode, controls the movement track of the wire electrode or metal workpiece through programmable software, and realizes the machining of microstructures such as microgrooves, micro-slits, and three-dimensional microstructures with complex shapes or high aspect ratios [ 8 ]. WECMM has the following advantages: a low machining temperature, no stress on the machining surface, no metamorphic layer, no tool loss, and is independent of the hardness of parts and materials [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Micro-Shaping of Pure Aluminum in Long-Duration Wire Electrochemical Micromachining Using Bipolar Nanosecond Pulses

Jia

Meng

2023

Micromachines

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With the increasing application of three-dimensional pure aluminum microstructures in micro-electromechanical systems (MEMS) and for fabricating terahertz components, high-quality micro-shaping of pure aluminum has gradually attracted attention. Recently, high-quality three-dimensional microstructures of pure aluminum with a short machining path have been obtained through wire electrochemical micromachining (WECMM), owing to its sub-micrometer-scale machining precision. However, machining accuracy and stability decrease owing to the adhesion of insoluble products on the surface of the wire electrode in long-duration WECMM, which limits the application of pure aluminum microstructures with a long machining path. In this study, the bipolar nanosecond pulses are used to improve the machining accuracy and stability in long-duration WECMM of pure aluminum. A negative voltage of −0.5 V was considered appropriate based on experimental results. Compared with the traditional WECMM using unipolar pulses, the machining accuracy of the machined micro-slit and the duration of stable machining were significantly improved in long-duration WECMM using bipolar nanosecond pulses.

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Electrochemical micromachining of ZrCu-based amorphous alloy in ethylene glycol solution

Cited by 9 publications

References 31 publications

Electrochemical Impedance Spectroscopy (EIS) Explanation of Single Crystal Cu(100)/Cu(111) in Different Corrosion Stages

Electrochemical Impedance Spectroscopy (EIS) Explanation of Single Crystal Cu(100)/Cu(111) in Different Corrosion Stages

Microfabricating Mirror-like Surface Precision Micro-Sized Amorphous Alloy Structures Using Jet-ECM Process

Micro-Shaping of Pure Aluminum in Long-Duration Wire Electrochemical Micromachining Using Bipolar Nanosecond Pulses

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