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

References

[1] Wu J M (吴建民), Xu J W (徐家文), Wu R (吴锐). Investigation of technique property of aluminum alloy electrochemical machining[J]. Journal of Material Engineering (材料工程), 2008, (8): 61-63.
[2] Zhao C X (赵长喜), Li J X (李继霞). The manufacturing technology for whole wall-plate structures of aircrafts[J]. Aerospace Manufacturing Technology (航天制造技术), 2006, (4): 44-48.
[3] Xu J W, Yun N Z, Tang Y X, et al. The modeling of NC-electrochemical contour evolution machining using a rotary tool-cathode[J]. Journal of Materials Processing Technology, 2005, 159(2): 272-277.
[4] Damme S Van, Nelissen G, Van Den B Bossch E, et al. Numerical model for predicting the efficiency behavior during pulsed electrochemical machining of steel in NaNO3[J]. Journal of Applied Electrochemistry, 2006, 36(1):1-10.
[5] Bejar M A, Gutierrez F. On the determination of current efficiency in electrochemical machining with a variable gap[J]. Journal of Materials Processing Technology, 1993, 37(2): 691-699.
[6] Haisch T, Mittemeijer E J, Schultze J W. High rate anodic dissolution of 100Cr6 steel in aqueous NaNO3 solution[J]. Journal of Applied Electrochemistry, 2004, 34(10): 997-1005.
[7] Wang M H, Zhu D. Simulation of fabrication for gas turbine blade turbulated cooling hole in ECM based on FEM[J]. Journal of Materials Processing Technology, 2009, 209(4): 1747-1751.
[8] Li Z Y (李志永), Zhu D (朱荻). Investigation of cathode designation and technique based on electric field and flow field characteristics for blade electrochemical machining[J]. China Mechanical Engineering (中国机械工程), 2006, 17(14): 1463-1466.
[9] Wei C J, Xu K Z, Ni J, et al. A finite element based model for electrochemical discharge machining in discharge regime[J]. The International Journal of Advanced Manufacturing Technology, 2011, 54(9/12): 987-995.
[10] Xu Z Y (徐正扬), Zhu D (朱荻), Shi X C (史先传). The optimization and test of flowing manner of electrolyte for electrochemical machining of engine blades[J]. Journal of Southeast University(Natural Science Edition) (东南大学学报(自然科学版)), 2008, 38(13): 434-438.
[11] Wu J M (吴建民), Xu J W (徐家文). Numeral simulation of 3D flow field for numeral controlling electrochemical machining of whole blade wheel[J]. China Mechanical Engineering (中国机械工程), 2009, 20(7): 780-783.
[12] Jiang L M (蒋利民), Huang X M (黄选民), Tian Z Q (田中群), et al. Investigation of microstructure machining on aluminum surface by confined etchant layer technique[J]. Chemical Journal of Chinese Universities (高等学校化学学报), 2006, 27(8): 1540-1544.
[13] Jiang L M (蒋利民), Cheng Z Y (程泽宇), Du N (杜楠), et al. Electrochemical machining of microstructure array on magnesium alloy surface[J]. Acta Physico-Chimica Sinica (物理化学学报), 2008, 24(7): 1307-1312.