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Discharge characteristics of confined cathode micro-arc oxidation

Zhang Xin-Meng Tian Xiu-Bo Gong Chun-Zhi Yang Shi-Qin

Discharge characteristics of confined cathode micro-arc oxidation

Zhang Xin-Meng, Tian Xiu-Bo, Gong Chun-Zhi, Yang Shi-Qin
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  • Abstract views:  4157
  • PDF Downloads:  1378
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Publishing process
  • Received Date:  31 May 2009
  • Accepted Date:  21 September 2009
  • Published Online:  05 April 2010

Discharge characteristics of confined cathode micro-arc oxidation

  • 1. State Key Laboratory of Advanced Welding Production and Technology, Harbin Institute of Technology, Harbin 150001, China

Abstract: Confined cathode micro-arc oxidation (CCMAO) has been investigated in Na2SiO3-KOH solution with industrial pure aluminum as substrate materials. The effects of the electrode distance (ED) on working current, potential distribution, arcing voltage and so on have been focused on. The energy efficiency as a function of ED has also been evaluated. The results show the working current decreases with increasing ED for the same exposure area of confined cathode and anode. However, the working current increases with increasing ED with only the cathode confined. It is attributed to different electrical field on the anode surface. With increasing ED, the electrical field beneath the confined cathode decreases while that far from the cathode increases. This leads to a different total working current. The arcing voltage increases with increasing ED while the effective voltage on anode surface nearly keeps constant. The thickness of the ceramic coating produced at a small ED is much higher than that at a larger ED. The energy consumption per unit volume of oxides by CCMAO indicates that smaller ED leads to higher energy efficiency.

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