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Corrosion resistant films were prepared on flame-resistant Mg–6Al–1Zn–2Ca (in mass%) alloy by steam coating using ultra pure water as steam source. The prepared films were characterized using SEM, XRD, and FT-IR. Corrosion resistance of the film was estimated by polarization curve measurement in 5 mass% NaCl aqueous solution. All XRD patterns of the films coated Mg–6Al–1Zn–2Ca alloy revealed that all films were composed of crystalline Mg(OH)2 and Mg–Al layered double hydroxide (LDH). FT-IR spectra showed that the Mg–Al LDH had carbonateand nitrate-ions in the interlayer. Potentiodynamic polarization curves of the film prepared at 433 K for 6 h indicated that the corrosion current density decreased by more than four orders of magnitude as compared to that of the uncoated Mg–6Al–1Zn–2Ca alloy. (Received May 22, 2017 Accepted July 17, 2017)

Preparation of corrosion resistant film on Mg–6Al–1Zn–2Ca alloy by steam coating