Stable Discharge Mechanism in Microarc Oxidation and Processing in Phosphate Electrolytes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Sui-Han Cui
  • Jia-Yu Zhu
  • Chao Yang
  • Ping-Hu Chen
  • Zhong-Can Wu
  • Zheng-Yong Ma
  • Ricky K. Y. Fu
  • Xiu-Bo Tian
  • Dai-Ning Fang
  • Zhong-Zhen Wu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)3126-3131
Number of pages6
Journal / PublicationIEEE Transactions on Plasma Science
Volume49
Issue number10
Online published20 Sep 2021
Publication statusPublished - Oct 2021

Abstract

Microarc oxidation (MAO) is a popular surface treatment process to generate oxide coatings with excellent mechanical properties on valve metals. As a plasma discharge technique, the discharge mechanism in MAO is different from that in the bipolar plate. Due to the alternating arcs and multiple electrolytes in MAO, it is difficult to control and optimize the coating properties. Based on the arcing mechanism and ion motion, the boundary conditions of no-arc discharge, alternating arc discharge, and continuous arc discharge are derived, and the relationship between the discharge current and breakdown current and sustained arc current is investigated. For the same electrolyte, the boundary conditions are determined by equivalent concentration and conductivity. The results show that in the stable alternating arc discharge regime, the higher the concentration and smaller the conductivity, the more intense is the discharge. According to the boundary conditions, MAO experiments are designed using phosphate electrolytes to improve the hardness of oxide coatings. By selecting electrolyte characteristics close to the continuous arc discharge boundary in the stable alternating arc discharge regime, the arc discharge is most intense and brightest and the largest energy is transferred to the Al2O3 coating. Consequently, the crystallinity and mechanical properties are improved significantly.

Research Area(s)

  • Arc discharges, Boundary conditions, Coatings, Conductivity, discharge energy, Discharges (electric), Electrolytes, Metals, microarc oxidation (MAO), phosphate electrolytes., Plasmas

Bibliographic Note

Research Unit(s) information for this publication is provided by the author(s) concerned.

Citation Format(s)

Stable Discharge Mechanism in Microarc Oxidation and Processing in Phosphate Electrolytes. / Cui, Sui-Han; Zhu, Jia-Yu; Yang, Chao; Chen, Ping-Hu; Wu, Zhong-Can; Ma, Zheng-Yong; Fu, Ricky K. Y.; Tian, Xiu-Bo; Fang, Dai-Ning; Chu, Paul K.; Wu, Zhong-Zhen.

In: IEEE Transactions on Plasma Science, Vol. 49, No. 10, 10.2021, p. 3126-3131.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review