Journal
CORROSION SCIENCE
Volume 47, Issue 6, Pages 1429-1444Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2004.07.038
Keywords
magnesium; anodic filins; plasma electrolytic oxidation; microarc
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Anodising of AM60 magnesium alloy (6% Al + 0.27% Mn) was studied in a solution containing 1.5 M KOH + 0.5 M KF + 0.25 M Na(2)HPO(4)(.)12H(2)O with addition of various NaAlO2 concentrations. The experiments were carried Out in DC current galvanostatic mode. Observations of phenomena occurring at the sample surface plus voltage monitoring revealed three stages: traditional anodising, followed by microarc anodising and finally arcing. The film was porous and cracked, with poor bonding to the substrate. It was composed of magnesium and aluminium oxide, and contained all the elements present in the electrolyte. The aluminium concentration in the film was dependent on the concentration of aluminate ions in the electrolyte. The transition from microarc to arcing stage took place when the alloy surface was completely covered by the anodic film. (c) 2004 Elsevier Ltd. All rights reserved.
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