Süry P, Semlitsch M
J Biomed Mater Res. 1978 Sep;12(5):723-41. doi: 10.1002/jbm.820120512.
An ideal combination of mechanical and corrosion properties of long-term implants such as joint endoprostheses has yet to be found. Besides being resistant to pitting and crevice attack, which can lead to corrosion fatigue and stress corrosion cracking failures, the implant material must be highly resistant to wear and abrasion. Two cobalt-based alloys, wrought CoNiMoTi and air-cast CoCrMo, were subjected to a number of selected in vitro electrochemically and chemically accelerated corrosion tests in chloride-containing solutions with wrought AISI-316L used as a reference alloy. A limited number of immersion tests in FeCl3 and acidified FeCl3 solutions were also conducted. It is found that the mechanical properties of wrought CoNiCrMoTi alloy qualify it as a substitute for cast CoCrMo alloy and wrought AISI-316L in anchorage shaft production for all types of joint endoprostheses. Wrought CoNiCrMoTi has a higher resistance to fatigue cracking compared with cast CoCrMo and is as resistant to selective corrosion phenomena such as stress corrosion cracking.
长期植入物（如关节假体）的机械性能和耐腐蚀性能的理想组合尚未找到。除了要抵抗点蚀和缝隙腐蚀（这可能导致腐蚀疲劳和应力腐蚀开裂失效）外，植入材料还必须具有高度的耐磨性。两种钴基合金，锻造CoNiMoTi和空气铸造CoCrMo，与作为参考合金的锻造AISI-316L一起，在含氯化物的溶液中进行了一系列选定的体外电化学和化学加速腐蚀试验。还在FeCl3和酸化FeCl3溶液中进行了有限数量的浸泡试验。结果发现，锻造CoNiCrMoTi合金的机械性能使其有资格替代铸造CoCrMo合金和锻造AISI-316L，用于生产各类关节假体的锚固轴。与铸造CoCrMo相比，锻造CoNiCrMoTi对疲劳开裂具有更高的抗性，并且对诸如应力腐蚀开裂等选择性腐蚀现象具有同等抗性。
