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Plasma Electrolytic Oxidation of AZ91 Mg Alloy in the Sodium Stannate Electrolyte

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Fig. 1SEM micrographs of oxide layer of AZ91 Mg alloy coated from the electrolyte with/without sodium stannate for 5 min; (a) and (b):surface morphology without and with sodium stannate, respectively (c) and (d): cross-section without and with sodium stannate,respectively.
Fig. 2Cross-section of oxide layer on AZ91 Mg alloy coated from the electrolyte with sodium stannate at 10 A/dm2 with coating time of(a) 2 min (b) 5 min (c) 10 min and (d) a variation of coating thickness with coating time.
Fig. 7XPS analysis of Sn4d for oxide layer on AZ91 Mg alloy coated fromthe electrolyte containing sodium stannate.
Fig. 9Potentiodynamic polarization curves of oxide layer on AZ91 Mgalloy with coating time.
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