Journal
CORROSION SCIENCE
Volume 55, Issue -, Pages 90-96Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2011.10.007
Keywords
Aluminium; SEM; Anodic films
Funding
- Japan Society for the Promotion of Science [19206077]
- Light Metal Educational Foundation Inc.
- Global COE, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [B01]
- Grants-in-Aid for Scientific Research [19206077] Funding Source: KAKEN
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Sequential anodic and cathodic pulse voltages were applied on anodised Al micro-electrodes in alkaline silicate electrolyte to explore the role of cathodic pulse in AC or bipolar plasma electrolytic oxidation (PEO) process. SEM observation was carried out to observe the sites of anodic and cathodic breakdown and their morphologies. The prior anodic breakdown accelerated the cathodic breakdown at -50 V, and the acceleration was associated with the preferential cathodic breakdown at the anodic breakdown sites. However, the succeeding anodic breakdown during applying anodic pulse of 420 V for 2 ms was highly suppressed at the cathodic breakdown sites. This would randomise the anodic breakdown sites. Such role may contribute to the formation of rather uniform coatings on aluminium in this electrolyte without large discharge channels when larger cathodic current is applied with respect to the anodic current in AC PEO. (C) 2011 Elsevier Ltd. All rights reserved.
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