Generation mechanism of microdischarges during plasma electrolytic oxidation of Al in aqueous solutions

被引：150
|
作者：
Moon, S. [1 ]
Jeong, Y. [1 ]
机构：
[1] Korea Inst Mat Sci, Changwon Si 641831, Kyungnam, South Korea
来源：
CORROSION SCIENCE | 2009年 / 51卷 / 07期
关键词：
Aluminium; Galvanostatic; Anodic films; ANODIC OXIDE-FILMS; PURE ALUMINUM; ELECTRICAL BREAKDOWN; COATINGS; GROWTH; MULLITE; DISSOLUTION; TITANIUM; PH;
D O I：
10.1016/j.corsci.2008.10.039
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The generation mechanism of microdischarges during plasma electrolytic oxidation (PEO) of aluminium was investigated at constant Current densities in aqueous alkaline solutions. Microdischarges were generated only in weakly alkaline solutions under high applied voltages. The breakdown voltage of the anodic oxide film was not dependent on the applied anodic current density while it was strongly dependent on the OH- concentration in the solution. The size and density of microdischarges became larger and lower, respectively, with increasing PEO treatment time. The mechanism of microdischarge generation Could be explained based on the movement of ions in the oxide film and resistive property of the oxide him. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1506 / 1512
页数：7
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