Effect of oxidation time on the corrosion behavior of micro-arc oxidation produced AZ31 magnesium alloys in simulated body fluid

被引：106
作者：
Gu, Yanhong [1 ,2 ]
Bandopadhyay, Sukumar [3 ]
Chen, Cheng-fu [2 ]
Guo, Yuanjun [4 ]
Ning, Chengyun [4 ]
机构：
[1] Beijing Inst Petrochem Technol, Coll Mech Engn, Beijing 102617, Peoples R China
[2] Univ Alaska Fairbanks, Dept Mech Engn, Fairbanks, AK 99775 USA
[3] Univ Alaska Fairbanks, Dept Min Engn, Fairbanks, AK 99775 USA
[4] S China Univ Technol, Coll Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 543卷
基金：
中国国家自然科学基金;
关键词：
AZ31 magnesium alloy; Microarc oxidation; Corrosion; Simulated body fluid; Hydroxyapatite; Ca/P ratio; BIOMEDICAL APPLICATIONS; PURE MAGNESIUM; COATINGS; RESISTANCE; RATIO; AZ91D; PROTECTION; CALCIUM; MAO;
D O I：
10.1016/j.jallcom.2012.07.130
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：
The electrochemical corrosion behavior of microarc oxidation (MAO) coatings produced at various oxidation times on AZ31 Mg alloys was studied in a simulated body fluid (SBF). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to characterize the corrosion behavior. The influences of the MAO time on the microstructure and corrosion properties are discussed. The initial porosity of the MAO coating was evaluated by the potentiodynamic polarization method. Postcorrosion phase identification showed that hydroxyapatite (HA) was formed on the surface of the samples. The ratio of Ca/P in HA was determined by the X-ray Fluorescence (XRF) technique. A physical model of the corrosion process with equivalent circuits at different corrosion stages is proposed. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：109 / 117
页数：9
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