TY - JOUR
T1 - Formation mechanism of Mg-Al layered double hydroxide-containing magnesium hydroxide films prepared on Ca-added flame-resistant magnesium alloy by steam coating
AU - Nakamura, Kae
AU - Tsunakawa, Mika
AU - Shimada, Yuta
AU - Serizawa, Ai
AU - Ishizaki, Takahiro
N1 - Funding Information:
This study was supported by Grants-in-Aid [grant number 16K18249 ] from the Japan Society for the Promotion of Science and Japan Science and Technology Agency (JST), Adaptable and Seamless Technology Transfer Program through Target-driven R&D (A-STEP) [grant number AS2815047S ].
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/11/15
Y1 - 2017/11/15
N2 - Corrosion resistant films were prepared on the Ca-added flame-resistant magnesium alloy AZCa612 by steam coating at different treatment time and temperature. The formation mechanism of the films was investigated by using the digital microscope, FE-SEM, XRD, FT-IR, XPS and the potentiodynamic polarization curve measurements in a 5 mass% NaCl aqueous solution. XRD, FT-IR and XPS studies indicated that the film was composed mainly of Mg(OH)2 and carbonated-based Mg–Al LDHs. In addition, MgCO3 and AlO(OH) were also incorporated slightly in the film. The formation mechanism of the film on AZCa612 was proposed that amorphous Mg(OH)2 was initially formed by reaction of steam and MgO as a natural oxide film on the substrate. With an increase in the temperature and pressure, the amorphous Mg(OH)2 was crystallized, and further increase in temperature, pressure, and treatment time induced the formation of Mg-Al LDH and AlO(OH) in the film.
AB - Corrosion resistant films were prepared on the Ca-added flame-resistant magnesium alloy AZCa612 by steam coating at different treatment time and temperature. The formation mechanism of the films was investigated by using the digital microscope, FE-SEM, XRD, FT-IR, XPS and the potentiodynamic polarization curve measurements in a 5 mass% NaCl aqueous solution. XRD, FT-IR and XPS studies indicated that the film was composed mainly of Mg(OH)2 and carbonated-based Mg–Al LDHs. In addition, MgCO3 and AlO(OH) were also incorporated slightly in the film. The formation mechanism of the film on AZCa612 was proposed that amorphous Mg(OH)2 was initially formed by reaction of steam and MgO as a natural oxide film on the substrate. With an increase in the temperature and pressure, the amorphous Mg(OH)2 was crystallized, and further increase in temperature, pressure, and treatment time induced the formation of Mg-Al LDH and AlO(OH) in the film.
KW - Ca-added flame resistant Mg alloy
KW - Formation mechanism
KW - Mg(OH)
KW - Mg-Al layered double hydroxide
KW - Steam coating
UR - http://www.scopus.com/inward/record.url?scp=85029330470&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85029330470&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2017.08.060
DO - 10.1016/j.surfcoat.2017.08.060
M3 - Article
AN - SCOPUS:85029330470
SN - 0257-8972
VL - 328
SP - 436
EP - 443
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
ER -