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首页> 外文期刊>International Journal of Electrochemical Science >Torsional Fretting Corrosion Behaviors of the CoCrMo/Ti6Al4V Couple
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Torsional Fretting Corrosion Behaviors of the CoCrMo/Ti6Al4V Couple

机译：CoCrMo / Ti6Al4V对的扭转微动腐蚀行为

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There are different forms of fretting corrosion on the fitting surface of hip prosthesis head and neck,which have an impact on the service life of the implant. In this paper, the torsional fretting corrosionexperiment of CoCrMo alloy and Ti6Al4V alloy in FBS solution was simulated by simulating thehead-neck taper contact mode of the hip joint. The effects of angular displacement amplitude andcontact load on the wear mechanism and electrochemical corrosion properties of prosthesis materialswere discussed. The results showed that the value of friction torque first increased and then tended tobe stable at the taper contact interface of CoCrMo head and Ti6Al4V neck under the condition of smallnormal load. However, the friction torque was stable at early stage with no significant increase underlarger loads. After friction, the corrosion potential of CoCrMo alloy was significantly negative and thecurrent of the anode region was obviously increased, which showed that the corrosion tendency ofmaterials increased. According to the results of the electrochemical corrosion test, the impedance ofCoCrMo alloy after friction decreased significantly, as well as the polarization resistance. When theangle displacement amplitude θ=2 °, obvious slip band could be found on the sample surface, whichwas badly worn and corroded under small normal load. Under larger normal load, a large number ofscratches along the twisting direction appeared on the worn surface, accompanied by peeling andcorrosion of the material. The relative movement of the sample surface was mainly based on partialslip.
机译：髋关节假体头部和颈部的配合表面上存在不同形式的微动腐蚀，这会影响植入物的使用寿命。通过模拟髋关节的头颈锥度接触方式，模拟了CoCrMo合金和Ti6Al4V合金在FBS溶液中的扭转微动腐蚀实验。讨论了角位移幅度和接触载荷对假体材料磨损机理和电化学腐蚀性能的影响。结果表明，在正常载荷较小的情况下，CoCrMo头部与Ti6Al4V颈部的锥度接触面的摩擦转矩值先增大然后趋于稳定。但是，摩擦扭矩在早期阶段是稳定的，在较大负载下没有明显增加。摩擦后，CoCrMo合金的腐蚀电位明显为负，阳极区的电流明显增加，表明材料的腐蚀趋势增加。根据电化学腐蚀试验的结果，摩擦后的CoCrMo合金的阻抗以及极化电阻均显着降低。当角位移幅度θ= 2°时，在试样表面会发现明显的滑移带，在很小的法向载荷下磨损严重并腐蚀。在较大的法向载荷下，在磨损的表面上会出现大量沿扭曲方向的划痕，并伴有材料的剥离和腐蚀。样品表面的相对运动主要基于偏滑。

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