TY - JOUR
T1 - Effect of treatment time in the Mg(OH)2/Mg–Al LDH composite film formed on Mg alloy AZ31 by steam coating on the corrosion resistance
AU - Kamiyama, Naosumi
AU - Panomsuwan, Gasidit
AU - Yamamoto, Erina
AU - Sudare, Tomohito
AU - Saito, Nagahiro
AU - Ishizaki, Takahiro
N1 - Funding Information:
This research was partially supported by a Grant for Advanced Industrial Technology Development, New Energy and Industrial Technology Development Organization (NEDO) of Japan (No. 11B06024d ) and JGC-S Scholarship Foundation .
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2016
Y1 - 2016
N2 - The corrosion resistant films were fabricated on Mg alloy AZ31 substrates by steam coating method using Al(NO3)3·9H2O aqueous solution as a steam source. The treatment temperature was maintained at 433 K, while the treatment time was varied at 3, 5, 7 and 9 h. X-ray diffraction (XRD) analysis demonstrated that the coated films were composed of a mixed structure of Mg(OH)2 and Mg–Al layered double hydroxide (Mg–Al LDH) phases. As revealed by the scanning electron microscopy (SEM) observation, the surface of coated films had a good uniformity of changing treatment times. The deposition rate increased exponentially with increasing treatment time. Fourier transform infrared (FT-IR) spectra showed that carbonate and nitrate ions were co-existed in the interlayer of Mg–Al LDH. The potentiodynamic polarization curves of the film coated for 7 h exhibited the lowest corrosion current density, which was almost four orders of magnitude lower than that of bare AZ31. The enhanced corrosion resistance was well consistent with the increase of Mg–Al LDH content in the films.
AB - The corrosion resistant films were fabricated on Mg alloy AZ31 substrates by steam coating method using Al(NO3)3·9H2O aqueous solution as a steam source. The treatment temperature was maintained at 433 K, while the treatment time was varied at 3, 5, 7 and 9 h. X-ray diffraction (XRD) analysis demonstrated that the coated films were composed of a mixed structure of Mg(OH)2 and Mg–Al layered double hydroxide (Mg–Al LDH) phases. As revealed by the scanning electron microscopy (SEM) observation, the surface of coated films had a good uniformity of changing treatment times. The deposition rate increased exponentially with increasing treatment time. Fourier transform infrared (FT-IR) spectra showed that carbonate and nitrate ions were co-existed in the interlayer of Mg–Al LDH. The potentiodynamic polarization curves of the film coated for 7 h exhibited the lowest corrosion current density, which was almost four orders of magnitude lower than that of bare AZ31. The enhanced corrosion resistance was well consistent with the increase of Mg–Al LDH content in the films.
KW - Corrosion resistance
KW - Layered double hydroxide (LDH)
KW - Magnesium alloy
KW - Magnesium hydroxide
KW - Steam coating
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U2 - 10.1016/j.surfcoat.2015.11.051
DO - 10.1016/j.surfcoat.2015.11.051
M3 - Article
AN - SCOPUS:84978708925
SN - 0257-8972
VL - 286
SP - 172
EP - 177
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -