纯镁在模拟体液中的腐蚀机理  

Mechanism of pure magnesium corrosion immersed in simulated body fluid

作　　者：王勇[1] 高家诚[1] 张艳[1] 周详发[1] 伍沙[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045

出　　处：《中国有色金属学报》2007年第12期1981-1986,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(0670562)

摘　　要：考察纯镁浸泡于模拟体液（SBF）中所发生的化学和物理过程，实验材料为扩散退火态，浸泡时间3-21d。结果发现，镁的腐蚀速率随时间增加而降低，同时溶液pH递增；裂纹和腐蚀坑是材料损伤的主要形貌特征，而MgCl2的局部富积是形成腐蚀坑的重要原因；随着浸泡时间延长，Mg（OH）2沉积于试样表面并逐步增长，成为Ca、P在Mg表面沉积的屏障，因此抑制Mg（OH）2的形成和生长是诱导磷酸钙陶瓷在Mg表面沉积的必要条件。The chemical and physical processes of magnesium immersed in SBF were investigated. The samples were as-annealed; the immersion time was 3-21 d. The result shows that as the immersion time increases, the corrosion rate decreases while the SBF pH increases. Network-like cracks and pits are the main damages resulting from corrosion. The locally buildup of MgCl2 is the major cause of pitting. A Mg（OH）2 forms and gradually covers the sample surface. This layer acts as the barrier for the precipitation of Ca and P on the sample surface, thus it is crucial to depress the formation of Mg（OH）2 in order to have calcium phosphate bioceramics deposit on magnesium surface.

关 键 词：纯镁 模拟体液 腐蚀 MG(OH)2 羟基磷灰石 

分 类 号：TG146.22[一般工业技术—材料科学与工程]