Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

被引：28

作者：

Gheytani, M. ^{[1
]}

Aliofkhazraei, M. ^{[1
]}

Bagheri, H. R. ^{[1
]}

Masiha, H. R. ^{[1
]}

Rouhaghdam, A. Sabour ^{[1
]}

机构：

[1] Tarbiat Modares Univ, Fac Engn, Dept Mat Sci, Tehran, Iran

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 649卷

关键词：

Coating material; Surfaces and interfaces; Corrosion; Scanning electron microscopy; Nanocomposite; Wettability; RESISTANCE; OXIDATION; BEHAVIOR; NANOPARTICLES;

D O I：

10.1016/j.jallcom.2015.07.139

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this paper, micro- and nanocrystalline AZ31B magnesium alloy were coated by micro-arc oxidation method. In order to fabricate nanocrystalline surface layer, surface mechanical attrition treatment was performed and nano-grains with average size of 5-10 nm were formed on the surface of the samples. Coating process was carried out at different conditions including two coating times and two types of electrolyte. Alumina nanoparticles were utilized as suspension in electrolyte to form nanocomposite coatings by micro-arc oxidation method. Potentiodynamic polarization, percentage of porosity, and wettability tests were performed to study various characteristics of the coated samples. The results of scanning electron microscope imply that samples coated in silicate-based electrolyte involve much lower surface porosity (similar to 25%). Besides, the results of wettability test indicated that the maximum surface tension with deionized water is for nanocrystalline sample. In this regard, the sample coated in silicate-based suspension was 4 times more hydrophilic than the microcrystalline sample. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：666 / 673

页数：8

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