Corrosion resistance of composite oxide film prepared on Ca-added flame-resistant magnesium alloy AZCa612 by micro-arc oxidation

» Autor: Oi Lun Li, Mika Tsunakawa, Yuta Shimada, Kae Nakamura, Kazuhito Nishinaka, Takahiro Ishizaki

» Referencia: Corrosion Science

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A composite oxide film was prepared on a flame-resistant magnesium alloy AZCa612 by micro-arc oxidation (MAO). The thickness of the film was approximately 30?m, where the film was composed of mainly of MgO and Mg-Mn-Al oxide. Potentiodynamic polarization curve measurements demonstrated that the corrosion current density of the composite oxide film coated AZCa612 decreased by 6 orders of magnitude compared to bare substrate. Immersion tests in 5wt. % NaCl solution after 42day indicated the coating phase did not change significantly, which proved that the MAO coating have superior corrosion resistance in 5wt.% NaCl aqueous solution.
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