Corrosion resistance of Mg(OH)2/Mg–Al layered double hydroxide composite film formed directly on combustion-resistant magnesium alloy AMCa602 by steam coating

• Composite films were formed on non-combustible magnesium alloy by steam coating.
• The film consists of mixed phases composed mainly of Mg(OH)2 and Mg–Al LDH.
• Corrosion resistance of the film were investigated by electrochemical measurements.

Films of the Mg(OH)2/Mg–Al layered double hydroxide composite were formed on the combustion-resistant magnesium alloy AMCa602 by steam coating and characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. The corrosion-resistance performances of the films in a 5 wt% NaCl solution were investigated using electrochemical measurements. The corrosion current density of the sample that was steam-coated at 433 K for 6 h using the aqueous solution containing 200 mM Al(NO3)3 decreased significantly more than that of the bare AMCa602. The correlations between the Mg–Al LDH content in the films, Al(NO3)3 concentration in the aqueous solutions, and corrosion current densities were investigated.

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