Journal
MATERIALS TRANSACTIONS
Volume 51, Issue 1, Pages 94-102Publisher
JAPAN INST METALS
DOI: 10.2320/matertrans.M2009226
Keywords
plasma electrolytic oxidation; AZ80 magnesium alloy; corrosion protection
Funding
- Japan Society for the Promotion of Science [19206077]
- Ministry of Education, Culture, Sports, Science and Technology, Japan
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Plasma electrolytic oxidation of AZ80 magnesium alloy in alkaline aluminate electrolytes develops MgAl2O4-based highly crystalline oxide coatings with the morphology changing largely with phosphate concentration in electrolyte. The thickness of the coatings increases with phosphate concentration from 5 mu m in phosphate-free electrolyte to similar to 70 mu m in the electrolyte containing 0.1 mol.dm(-3) phosphate after anodizing for 900 s. The formation of the latter thick coating is associated with intense sparking during, anodizing. The thick coatings formed in the electrolytes containing 0.075 and 0.1 mol.dm(-3) phosphate are highly cracked. In contrast, the coating formed in the electrolyte containing 0.05 mol.dm(-3) phosphate is relatively uniform, showing the highest corrosion protection in 0.5 mol.dm(-3) NaCl solution. The coatings consist of two layers, comprising an outer thick layer with high concentration of aluminum and an inner thin magnesium-rich layer. [doi:10.2320/matertrans.M2009226]
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