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

详细信息    查看全文

• 作者：Yanhong Gu ; Sukumar B ; opadhyay ; Cheng-fu Chen ; Yuanjun Guo ; Chengyun Ning
• 关键词：AZ31 magnesium alloy ; Microarc oxidation ; Corrosion ; Simulated body fluid ; Hydroxyapatite ; Ca/P ratio
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 出版时间：5 December, 2012
• 年：2012
• 卷：543
• 期：Complete
• 页码：109-117
• 全文大小：2131 K

文摘

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. Post-corrosion 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.