Microstructure and corrosion resistance of Ce-V conversion coating on AZ31 magnesium alloy

被引：58
作者：
Jiang, Xiao [1 ]
Guo, Ruiguang [1 ]
Jiang, Shuqin [1 ]
机构：
[1] Xian Univ Architecture & Technol, Minist Educ, Key Lab Northwest Water Resources Environm & Ecol, Xian 710055, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2015年 / 341卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloy; Cerium; Vanadium; Conversion coating; Ball cratering; CERIUM; PROTECTION; FILMS; PERFORMANCE; EVOLUTION; CHROMATE; BEHAVIOR;
D O I：
10.1016/j.apsusc.2015.02.195
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：
A Ce-V conversion coating was developed to improve the corrosion resistance of AZ31 magnesium alloy. Scanning electronic microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectrometer (XPS), grazing incidence X-ray diffraction (GIXRD) and the ball cratering test were adopted to study the morphology, chemical composition, structure and thickness of the coating. The coating has duplex structure with network and its thickness is about 2 pin. The coating contains high contents of Ce and V, which exhibits amorphous structure. Potentiodynamic polarization shows the coating can increase the corrosion potential and reduce the corrosion current density of AZ31 magnesium alloy. Moreover, the electrochemical impedance spectra exhibit the coating significantly improves the corrosion resistance of AZ31 magnesium alloy. Results indicate that the Ce-V conversion coating can provide effective protection to AZ31 magnesium alloy. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：166 / 174
页数：9
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