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Metals 2017, 7(1), 30; doi:10.3390/met7010030

Electropolishing Behaviour of 73 Brass in a 70 vol % H3PO4 Solution by Using a Rotating Cylinder Electrode (RCE)

1
Department of Mechanical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
2
Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan
3
Bone and Joint Research Center, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo Lopez
Received: 19 August 2016 / Revised: 16 December 2016 / Accepted: 16 January 2017 / Published: 20 January 2017
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Abstract

The electropolishing behaviour of 73 brass was studied by means of a rotating cylinder electrode (RCE) in a 70 vol % H3PO4 solution at 27 °C. Owing to the formation of a blue Cu2+-rich layer on the brass-RCE, an obvious transition peak was detected from kinetic- to diffusion-controlled dissolution in the anodic polarisation curve. Electropolishing was conducted at the potentials located at the transition peak, the start, the middle, and the end positions in the limiting-current plateau corresponding to the anodic polarisation curve of the brass-RCE. A well-polished surface can be obtained after potentiostatic electropolishing at the middle position in the limiting-current plateau. During potentiostatic etching in the limiting-current plateau, a blue Cu2+-rich layer was formed on the brass-RCE, reducing its anodic dissolution rate and obtaining a levelled and brightened brass-RCE. Moreover, a rod climbing phenomenon of the blue Cu2+-rich layer was observed on the rotating brass-RCE. This enhances the coverage of the Cu2+-rich layer on the brass-RCE and improves its electropolishing effect obviously. View Full-Text
Keywords: electropolishing; brass-RCE; Cu2+-rich layer; rod climbing electropolishing; brass-RCE; Cu2+-rich layer; rod climbing
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MDPI and ACS Style

Huang, C.A.; Chen, J.Y.; Sun, M.T. Electropolishing Behaviour of 73 Brass in a 70 vol % H3PO4 Solution by Using a Rotating Cylinder Electrode (RCE). Metals 2017, 7, 30.

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