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Comparison of the electrochemical behavior of CoCrWNi, CoCrFeNiMo, and CoNiCrMo alloys.
Journal of Biomedical Materials Research Part B: Applied Biomaterials ( IF 3.4 ) Pub Date : 2020-05-09 , DOI: 10.1002/jbm.b.34627
Bruce G Pound 1
Affiliation  

Numerous studies have examined the electrochemical behavior of Co‐28Cr‐6Mo and Co‐35Ni‐20Cr‐10Mo in simulated physiological solutions. However, two other CoCr alloys—Co‐20Cr‐15W‐10Ni and Co‐20Cr‐16Fe‐15Ni‐7Mo—have received relatively little attention. In this work, cyclic potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical behavior of as‐received and passivated CoCrWNi and CoCrFeNiMo in phosphate‐buffered saline. Comparison of the potentiodynamic results with those for as‐received and electropolished CoNiCrMo showed marked differences in the passive behavior of the three alloys, even though they are all Co‐20Cr. The passive film on all three alloys underwent solid‐state oxidation involving Cr(III) to Cr(VI) and Co(II) to Co(III). However, the alloys then differed substantially in their behavior. CoCrFeNiMo exhibited no further changes up to the onset of water oxidation, whereas CoNiCrMo was subject to transpassive dissolution, while CoCrWNi underwent a second oxidation and then localized breakdown of the oxide. The EIS results also showed differences between the alloys with regard to the oxide thickness and resistivity. The thickness increased in the order CoCrFeNiMo < CoNiCrMo < CoCrWNi. Passivation increased the thickness but did not significantly affect the resistivity. For the as‐received alloys, the resistivity increased with thickness, suggesting that the oxide films became less defective with increasing thickness.

中文翻译:

CoCrWNi、CoCrFeNiMo 和 CoNiCrMo 合金的电化学行为比较。

许多研究已经检查了 Co-28Cr-6Mo 和 Co-35Ni-20Cr-10Mo 在模拟生理溶液中的电化学行为。然而,另外两种 CoCr 合金——Co-20Cr-15W-10Ni 和 Co-20Cr-16Fe-15Ni-7Mo——很少受到关注。在这项工作中,循环动电位极化和电化学阻抗谱 (EIS) 用于研究原样和钝化的 CoCrWNi 和 CoCrFeNiMo 在磷酸盐缓冲盐水中的电化学行为。将动电位结果与原样和电抛光 CoNiCrMo 的动电位结果进行比较,表明三种合金的钝化行为存在显着差异,即使它们都是 Co-20Cr。所有三种合金上的钝化膜都经历了固态氧化,包括 Cr(III) 到 Cr(VI) 和 Co(II) 到 Co(III)。然而,然后这些合金的行为就大不相同了。CoCrFeNiMo 在水氧化开始之前没有表现出进一步的变化,而 CoNiCrMo 经历了跨钝化溶解,而 CoCrWNi 经历了第二次氧化,然后局部分解了氧化物。EIS 结果还显示合金之间在氧化物厚度和电阻率方面存在差异。厚度按 CoCrFeNiMo < CoNiCrMo < CoCrWNi 的顺序增加。钝化增加了厚度,但没有显着影响电阻率。对于原样的合金,电阻率随着厚度的增加而增加,这表明随着厚度的增加,氧化膜的缺陷越来越少。而 CoCrWNi 经历了第二次氧化,然后局部击穿了氧化物。EIS 结果还显示合金之间在氧化物厚度和电阻率方面存在差异。厚度按 CoCrFeNiMo < CoNiCrMo < CoCrWNi 的顺序增加。钝化增加了厚度,但没有显着影响电阻率。对于原样的合金,电阻率随着厚度的增加而增加,这表明随着厚度的增加,氧化膜的缺陷越来越少。而 CoCrWNi 经历了第二次氧化,然后局部击穿了氧化物。EIS 结果还显示合金之间在氧化物厚度和电阻率方面存在差异。厚度按 CoCrFeNiMo < CoNiCrMo < CoCrWNi 的顺序增加。钝化增加了厚度,但没有显着影响电阻率。对于原样的合金,电阻率随着厚度的增加而增加,这表明随着厚度的增加,氧化膜的缺陷越来越少。钝化增加了厚度,但没有显着影响电阻率。对于原样的合金,电阻率随着厚度的增加而增加,这表明随着厚度的增加,氧化膜的缺陷越来越少。钝化增加了厚度,但没有显着影响电阻率。对于原样的合金,电阻率随着厚度的增加而增加,这表明随着厚度的增加,氧化膜的缺陷越来越少。
更新日期:2020-05-09
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