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

被引：91

作者：

Kamiyama, Naosumi ^{[1
]}

Panomsuwan, Gasidit ^{[2
]}

Yamamoto, Erina ^{[1
]}

Sudare, Tomohito ^{[3
]}

Saito, Nagahiro ^{[3
,4
,5
]}

Ishizaki, Takahiro ^{[2
]}

机构：

[1] Shibaura Inst Technol, Grad Sch Engn & Sci, Dept Mat Sci & Engn, 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

[3] Nagoya Univ, Grad Sch Engn, Dept Mat Phys & Energy Engn, Chikusa Ku, Furocho, Nagoya, Aichi 4638603, Japan

[4] Nagoya Univ, Inst Innovat Future Soc, Chikusa Ku, Furocho, Nagoya, Aichi 4638603, Japan

[5] Nagoya Univ, Green Mobil Collaborat Res Ctr, Chikusa Ku, Furocho, Nagoya, Aichi 4638603, Japan

来源：

SURFACE & COATINGS TECHNOLOGY | 2016年 / 286卷

关键词：

Magnesium alloy; Corrosion resistance; Layered double hydroxide (LDH); Steam coating; Magnesium hydroxide; LAYERED DOUBLE HYDROXIDE; MAGNESIUM ALLOY; AZ91;

D O I：

10.1016/j.surfcoat.2015.11.051

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The corrosion resistant films were fabricated on Mg alloy AZ31 substrates by steam coating method using Al(NO3)(3)center dot 9H(2)O 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 coexisted 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. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：172 / 177

页数：6

共 38 条

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