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http://dx.doi.org/10.5695/JKISE.2011.44.2.044

Characteristics of Films Formed on AZ31B Magnesium Alloy by Chemical Oxidation Process in Potassium Permanganate Solution  

Kim, Min-Jeong (Korea Institute of Industrial Technology, Convergence Component Material R&D Group)
Kim, Hyoung-Chan (Korea Institute of Industrial Technology, Convergence Component Material R&D Group)
Yoon, Seog-Young (School of Materials Science and Engineering, Pusan National University)
Jung, Uoo-Chang (Korea Institute of Industrial Technology, Convergence Component Material R&D Group)
Publication Information
Journal of the Korean institute of surface engineering / v.44, no.2, 2011 , pp. 44-49 More about this Journal
Abstract
The films formed on AZ31B magnesium alloy were prepared from alkaline solution composed of potassium permanganate and sodium hydroxide. The immersion tests were carried out at the different concentration of sodium hydroxide and pre-treatment method in 5 minute. The morphology and the phase composition of the film were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The corrosion behavior of the film in 5.0% NaCl solution was evaluated using potentiodyanmic polarization. Open circuit potential in developing film was examined with time. The thin and transparent film was mainly composed of MgO and $Mg(OH)_2$. The film with the best corrosion resistance was obtained at $70^{\circ}C$ bath temperature, 1.6 M concentration of sodium hydroxide and chemical pre-treatment.
Keywords
Magnesium alloy; Oxide film; Corrosion; Chemical oxidation;
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