Passivation Behavior of Aluminum Alloy during Electrochemical Machining and Its Effects on the Machining Performance

Authors

Li-min JIANG, School of Material Science & Engineering, Nanchang Hangkong University, National Defense Key Laboratory of Light Alloys Processing Science and Technology, Nanchang 330063, China;Follow
Wen-bo DENG, School of Material Science & Engineering, Nanchang Hangkong University, National Defense Key Laboratory of Light Alloys Processing Science and Technology, Nanchang 330063, China;
Jun-long YING, School of Material Science & Engineering, Nanchang Hangkong University, National Defense Key Laboratory of Light Alloys Processing Science and Technology, Nanchang 330063, China;

Corresponding Author

Li-min JIANG(lm-jiang@vip.sina.com)

Abstract

The passivation behavior of aluminum alloy during electrochemical machining was investigated and discussed. The effects of processing voltage, current density, space of electrodes and electrolyte composition on electrochemical machining performance were explored. The results indicate that the electrochemical machining aluminum alloy in the composite electrolyte system containing NaNO₃ and NaF existed passivation phenomenon. Passivation action decreaseed the current efficiency and made it varied greatly with the current density. Also the passivation shifted the interspace characteristic curve of electrode notably to a negative direction. There was not passivation phenomenon in the composite electrolyte system containing the same concentrations of NaCl and NaF for the electrochemical machining of aluminum alloy. It kept active dissolution in a wide range of potential. More uniform machining surface could be obtained in passive electrolyte.

Graphical Abstract

Keywords

electrochemical machining, aluminum alloy, passivation, current efficiency, topography

DOI Link

https://doi.org/10.13208/j.electrochem.130104

Publication Date

2014-02-25

Online Available Date

2014-02-24

Revised Date

2013-03-04

Received Date

2013-01-04

Recommended Citation

Li-min JIANG, Wen-bo DENG, Jun-long YING. Passivation Behavior of Aluminum Alloy during Electrochemical Machining and Its Effects on the Machining Performance[J]. Journal of Electrochemistry, 2014 , 20(1): 28-32.
DOI: 10.13208/j.electrochem.130104
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss1/6