AZ31镁合金在Hank’s仿生溶液中的电化学腐蚀行为研究  

Study on Electrochemical Corrosion Property of Magnesium Alloy AZ31 in Hank's Solutions

作　　者：张春艳[1] 刘成龙[1] 杨惠[1] 张露瑶 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400050

出　　处：《武汉理工大学学报》2014年第2期21-25,43,共6页Journal of Wuhan University of Technology

基　　金：国家青年自然科学基金(51201192);重庆市自然科学基金(2010BB4308)

摘　　要：为研究镁合金在人体生理环境下的腐蚀行为,采用阳极极化和电化学交流阻抗谱(EIS)测量技术研究了AZ31镁合金在Hank’s仿生溶液中的电化学腐蚀行为及腐蚀产物形成过程;利用扫描电子显微镜(SEM)和X射线能谱仪(EDS)分析不同浸泡时间腐蚀产物膜的形貌和成分变化。研究结果表明:镁合金AZ31在Hank’s溶液中浸泡最初10min,表面形成新的MgO钝化膜。镁合金的腐蚀经历了点蚀的诱导、点蚀的发展和腐蚀产物层的生成3个阶段,腐蚀过程中除Mg的溶解过程外,还有H2PO-4、HPO2-4、PO3-4、Ca2+在镁合金表面的吸脱附过程。镁合金点蚀处磷酸钙盐沉积较多,表明镁离子的溶解促进了磷酸钙的沉积。In order to study the corrosion behavior of the magnesium alloy in the human body physiological environ ment, the electrochemical corrosion behaviors and corrosion process of the AZ31 magnesium alloy in Hank＇ s solution were estimated by using anodic polarization measurements and electrochemical impedance spectroscopy （EIS）. The morpholo- gies and compositions of the corrosion products were investigated by means of SEM, EDS and XRD. The experimental re- sult showed that the passive film of MgO was formed on magnesium alloy AZ31 in the initial immersion of 10 minutes. The corrosion process experienced induction and development of corrosive pitting and formation of corrosion product lay- er. In addition to the dissolution of magnesium, the adsorption and desorption reactions of H2P04, HP024- ,POs- ,Ca2＋ were also involved in the corrosion process. There are more sediment of calcium phosphate at the corrosion location of magnesium alloy,showing that the dissolution of magnesium ions promotes the deposition of calcium phosphate.

关 键 词：镁合金AZ31 生物材料 Hank’s溶液 电化学阻抗谱 腐蚀行为 

分 类 号：TG174.45[金属学及工艺—金属表面处理]