Electrochemical machining of molybdenum

Schneider, Michael; Šimůnková, L.; Michaelis, Alexander; Hoogsteen, W.

doi:10.1016/j.ijrmhm.2021.105689

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…8G,H). When the current density reached 30 A/ cm 2 , the oxygen-rich region was broken and the oxy- gen content increased, attributed to the stronger electrolytic effect and anodic oxygen evolution [35][36][37]. Unlike surface of G1 at 1 A/cm 2 , there was no intergranular corrosion on the surface of G2 at low current density.…”

Section: Ecm Experimentsmentioning

confidence: 99%

Low Temperature Interface Modification: Electrochemical Dissolution Mechanism of Typical Iron and Nickel Base Alloys

Lu,

Xu,

Geng

2024

J. Electrochem. Sci. Technol

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Due to its unique advantages, electrochemical machining (ECM) is playing an increasingly significant role in the manufacture of difficult-to-machine materials. Most of the current ECM research is conducted at room temperature, with studies on ECM in a cryogenic environment not having been reported to date. This study is focused on the electrochemical dissolution characteristics of typical iron and nickel base alloys in NaNO<sub>3</sub> solution at low temperature (–10°C). The polarization behaviors and passive film properties were studied by various electrochemical test methods. The results indicated that a higher voltage is required for decomposition and more pronounced pitting of their structures occurs in the passive zone in a cryogenic environment. A more in-depth study of the composition and structure of the passive films by X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy showed that the passive films of the alloys are modified at low temperature, and their capacitance characteristics are more prominent, which makes corrosion of the alloys more likely to occur uniformly. These modified passive films have a huge impact on the surface morphologies of the alloys, with non-uniform corrosion suppressed and an improvement in their surface finish, indicating that lowering the temperature improves the localization of ECM. Together with the cryogenic impact of electron energy state compression, the accuracy of ECM can be further improved.

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Section: Ecm Experimentsmentioning

confidence: 99%

Low Temperature Interface Modification: Electrochemical Dissolution Mechanism of Typical Iron and Nickel Base Alloys

Lu,

Xu,

Geng

2024

J. Electrochem. Sci. Technol

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“…1c), which emerged in 2003/2004, 31,32 represents a more attractive laboratory setup for investigation of ECM fundamentals because it simultaneously enables a near-ECM environment, allows for use of almost all common measurement techniques, and reduces the subsequent analysis efforts required. [8][9][10][11]22,[33][34][35][36][37] Because of the θ-type cross-section, there are two channels, which serve as the inlet and the outlet, to enable realization of fast electrolyte flow. Importantly, the small WE area determined by the end mouth of the θ-capillary and the narrow WEz E-mail: wdliu@cauc.edu.cn to-CE gap allows polarization to the high current density range when using a potentiostat.…”

mentioning

confidence: 99%

Developing a New Flow Cell for Electrochemical Machining Anodic Dissolution Investigations by Simulation-Based Design and 3D Printing

Liu,

Li,

Zhao

et al. 2023

J. Electrochem. Soc.

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Electrochemical machining (ECM) is an essential non-traditional industrial shaping technology. An in-depth understanding of ECM anodic dissolution is fundamentally important for process parameter design and optimization. However, the existing electrochemical setups face challenges in achieving efficient analysis of these processes. In this work, a new flow cell has been developed via simulation-based design and 3D printing that demonstrates comprehensive advantages in terms of improved electric and flow conditions, measurement technique versatility, and production simplicity at low cost. Simulations are performed to reveal particular characteristics of the proposed cell in terms of physical distributions and to determine its key dimensions with high efficiency. The stereo lithography technique is used to realize the complex design and fabricate the proposed flow cell, thus ensuring ease of accessibility. Furthermore, the effectiveness of the developed cell is verified experimentally by examining the anodic behavior of typical metals in common ECM electrolytes, using Fe and SS304 stainless steel as examples. Test results show that information on the polarization behavior, current efficiency, anodic interface structure, and surface finish can be obtained conveniently and the results agree with previous findings, demonstrating the potential of the developed cell to perform high throughput tests to study ECM fundamentals.

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Additive Manufacturing of Biodegradable Molybdenum – From Powder to Vascular Stent

Bian,

Tong,

Gong

et al. 2024

Advanced Materials

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Magnesium, iron and zinc based biodegradable metals are widely recognized as promising candidate materials for the next generation of bioresorbable stent (BVS). However, none of those metal BVSs are perfect at this stage. Here, we developed a brand‐new BVS based on a novel biodegradable metal (Molybdenum, Mo) through additive manufacturing. Nearly full‐dense and crack‐free thin‐wall Mo was directly manufactured through selective laser melting (SLM) with fine Mo powder. Systemic analyses considering the forming quality, wall‐thickness, microstructure, mechanical properties and degradation behaviors were performed. Then, Mo‐based thin‐strut (≤ 100 µm) stents were successfully obtained through an optimized single‐track laser melting route. The SLMed thin‐wall Mo owns comparable strength to its Mg and Zn based counterparts (as‐drawn), whilst, it exhibits remarkable biocompatibility in vitro. Vessel related cells are well adhered and spread on SLMed Mo, and it exhibits a low risk of hemolysis and thrombus. The SLMed stent is compatible to vessel tissues in rat abdominal aorta, and it can provide sufficient support in an animal model as an extravascular stent. This work possibly opens a new era of manufacturing Mo‐based stents through additive manufacturing.This article is protected by copyright. All rights reserved

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Electrochemical machining of molybdenum

Cited by 10 publications

References 22 publications

Low Temperature Interface Modification: Electrochemical Dissolution Mechanism of Typical Iron and Nickel Base Alloys

Low Temperature Interface Modification: Electrochemical Dissolution Mechanism of Typical Iron and Nickel Base Alloys

Developing a New Flow Cell for Electrochemical Machining Anodic Dissolution Investigations by Simulation-Based Design and 3D Printing

Additive Manufacturing of Biodegradable Molybdenum – From Powder to Vascular Stent

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