Formation mechanism of Mg-Al layered double hydroxide-containing magnesium hydroxide films prepared on Ca-added flame-resistant magnesium alloy by steam coating

被引：32

作者：

Nakamura, Kae ^{[1
]}

Tsunakawa, Mika ^{[1
]}

Shimada, Yuta ^{[1
]}

Serizawa, Ai ^{[2
]}

Ishizaki, Takahiro ^{[2
]}

机构：

[1] Shibaura Inst Technol, Mat Sci & Engn, Grad Sch Engn & Sci, Koto Ku, 3-7-5 Toyosu, Tokyo 1358548, Japan

[2] Shibaura Inst Technol, Dept Mat Sci & Engn, Coll Engn, Koto Ku, 3-7-5 Toyosu, Tokyo 1358548, Japan

来源：

SURFACE & COATINGS TECHNOLOGY | 2017年 / 328卷

基金：

日本学术振兴会; 日本科学技术振兴机构;

关键词：

Ca-added flame resistant Mg alloy; Steam coating; Formation mechanism; Mg(OH)(2); Mg-Al layered double hydroxide; CORROSION-RESISTANCE; OXIDATION BEHAVIOR; SURFACE-CHEMISTRY; PHOSPHATE; AZ31; ADDITIONS; TIME;

D O I：

10.1016/j.surfcoat.2017.08.060

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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% NaCI aqueous solution. XRD, Fr-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. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：436 / 443

页数：8

共 36 条

[31] Hydrothermal synthesis of layered double hydroxides (LDHs) from mixed MgO and Al2O3:: LDH formation mechanism [J].