Fabrication of hydrophobic surface with hierarchical structure on Mg alloy and its corrosion resistance

被引：118

作者：

Wang, Jun ^{[1
]}

Li, Dandan ^{[1
]}

Liu, Qi ^{[1
]}

Yin, Xi ^{[1
]}

Zhang, Ying ^{[1
]}

Jing, Xiaoyan ^{[1
]}

Zhang, Milin

机构：

[1] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2010年 / 55卷 / 22期

关键词：

Conversion coating; Silylation; Hydrophobicity; Corrosion resistance; Mg alloy; LAYERED DOUBLE HYDROXIDE; SUPERHYDROPHOBIC SURFACE; IMPEDANCE SPECTROSCOPY; MAGNESIUM ALLOY; COATINGS; FILMS; WETTABILITY; ADHESIVE; ALUMINUM; CONVERSION;

D O I：

10.1016/j.electacta.2010.05.070

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A hydrotalcite/hydromagnesite conversion coating with hierarchical structure has been fabricated on a Mg alloy substrate by in situ hydrothermal crystallization method. A MgO layer existing between the hydrotalcite/hydromagnesite film and the substrate was formed prior to the hydrotalcite/hydromagnesite film during the crystallization process. After surface treatment with silane coupling agent, the surface of conversion coating changes from hydrophilic to hydrophobic. Scanning electron microscopy (SEM) revealed that the silylated conversion coating with hierarchical structure maintains the original rough surface of which was composed of numerous micro-scale flakes and beautiful flower-like protrusions. Polarization measurements have shown that the hydrophobic conversion coating exhibited a low corrosion current density value of 0.432 mu A/cm(2), which means that the hydrophobic conversion coating can effectively protect Mg alloy from corrosion. Electrochemical impedance spectroscopy (EIS) showed that the impedance of the hydrophobic conversion coating was 9000 Omega. It means that the coating served as a passive layer with high charge transfer resistance. (c) 2010 Elsevier Ltd. All rights reserved.

引用

页码：6897 / 6906

页数：10

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