Effect of oxidation time on the corrosion behavior of micro-arc oxidation produced AZ31 magnesium alloys in simulated body fluid
Effect of oxidation time on the corrosion behavior of micro-arc oxidation produced AZ31 magnesium alloys in simulated body fluid
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DOI：
10.1016/j.jallcom.2012.07.130
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发表时间：
2012-12-05
影响因子：
6.2
通讯作者：
Ning, Chengyun
中科院分区：
文献类型：
--
作者：
Gu, Yanhong;Bandopadhyay, Sukumar;Ning, Chengyun
研究了AZ31镁合金微弧氧化(MAO)膜在模拟体液(SBF)中的电化学腐蚀行为。用动电位极化和电化学阻抗谱(EIS)对腐蚀行为进行了表征。讨论了微弧氧化时间对组织和腐蚀性能的影响。用动电位极化法测定了微弧氧化涂层的初始孔隙率。腐蚀后物相分析表明，样品表面生成了羟基磷灰石(HA)。用X射线荧光(XRF)技术测定羟基磷灰石中钙磷比。提出了具有不同腐蚀阶段等效电路的腐蚀过程物理模型。(C)2012爱思唯尔B.V.保留所有权利。
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.