An insight into cathodic reactions during wire electrochemical micromachining in aqueous hydrochloric acid solution

In wire electrochemical micromachining, insoluble products are still generated in spite of the use of acidic electrolyte and adhere onto the wire cathode. In this work, the compositions of the adhered products and their influences on the electrochemical characteristics of the wire cathode were studi...

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Bibliographic Details
Published in:Electrochimica acta 2019-02, Vol.295, p.67-74
Main Authors: Gao, Chuanping, Qu, Ningsong, Ding, Bing, Shen, Yizhou
Format: Article
Language:English
Subjects:
Cathodes
Chemical reactions
Electrochemical impedance spectroscopy
Electrodeposition
Electrolysis product
Electrophoresis
Hydrochloric acid
Iron
Machining
Micromachining
Wire
Wire electrochemical micromachining
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Summary:In wire electrochemical micromachining, insoluble products are still generated in spite of the use of acidic electrolyte and adhere onto the wire cathode. In this work, the compositions of the adhered products and their influences on the electrochemical characteristics of the wire cathode were studied. The XRD results suggest that the insoluble products are mainly composed of γ-Fe2O3 and α-FeOOH and that reduction of Fe ions occurs on the wire cathode to form metallic Fe (α-Fe). In addition, the electrochemical impedance spectroscopy measurement results indicate that the electrochemical characteristics of the wire cathode are significantly affected by the insoluble products. These insoluble products together with the deposited iron on the wire pose negative effects on the machining results. Finally, qualitative models for the cathodic reactions are proposed.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.10.140