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3～21 d.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.
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