Okazaki Yoshimitsu
Institute of Mechanical Systems Engineering, National Institute of Advanced Industrial Science and Technology, Independent Administrative Institution, Tsukuba, Ibaraki, Japan.
Biomaterials. 2002 May;23(9):2071-7. doi: 10.1016/s0142-9612(01)00337-4.
The effect of friction on the anodic polarization properties of metallic biomaterials in a physiological saline solution was investigated. The current density during friction becomes higher than during the static condition. The fluctuation range of the current density caused by the destruction and formation of passive film was observed. For SUS316L stainless steel and Co-Cr-Mo casting alloy, the fluctuation range was observed in the passivity zone. Otherwise, for Ti alloys, the fluctuation range was observed in both the activity and passivity zones. The decrease of the corrosion potential for Ti alloys due to friction was much larger than that of SUS316L stainless steel and Co-Cr-Mo casting alloy. From this result, it was considered that in a the frictional environment, the stressing zone turned anodic and its periphery cathodic, and corrosion tended to progress more than in the static environment. The effect of wear on the anodic polarization curves also changed depending on the frictional load, potential zone and the pH of the solution. A rapid increase in current density due to corrosion starting from the frictional area was found in the Ti-6Al-4V and Ti-15Mo-5Zr-3Al alloys containing Al. However, for the new Ti-15Zr-4Nb-4Ta alloy, this rapid increase was not seen in the high-potential region. The effect of the lateral reciprocal speed was also negligible for the new Ti alloy. It was found that the new Ti-15Zr-4Nb-4Ta alloy exhibited excellent corrosion resistance under friction.
研究了摩擦对金属生物材料在生理盐溶液中阳极极化性能的影响。摩擦过程中的电流密度高于静态条件下的电流密度。观察到由钝化膜的破坏和形成引起的电流密度波动范围。对于SUS316L不锈钢和Co-Cr-Mo铸造合金，在钝化区观察到波动范围。否则，对于钛合金，在活性区和钝化区均观察到波动范围。钛合金因摩擦导致的腐蚀电位下降比SUS316L不锈钢和Co-Cr-Mo铸造合金大得多。由此结果认为，在摩擦环境中，应力区变为阳极，其周边为阴极，腐蚀比在静态环境中更容易进行。磨损对阳极极化曲线的影响也因摩擦载荷、电位区和溶液pH值而异。在含铝的Ti-6Al-4V和Ti-15Mo-5Zr-3Al合金中，发现从摩擦区域开始由于腐蚀导致电流密度迅速增加。然而，对于新型Ti-15Zr-4Nb-4Ta合金，在高电位区域未观察到这种迅速增加。横向往复速度对新型钛合金的影响也可忽略不计。发现新型Ti-15Zr-4Nb-4Ta合金在摩擦条件下表现出优异的耐腐蚀性。
