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Metals 2017, 7(1), 30;

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

Department of Mechanical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan
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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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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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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