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比较了未再结晶和再结晶Ti12Mo5Ta合金、未再结晶Ti12Mo合金和工业用纯钛(cp-Ti)在0.9%生理盐水(pH 2.3)中37°C下的电化学行为。从阳极极化曲线中得到了极低的钝化电流密度(10-6 A/cm2),这表明所有样品在酸性0.9%NaCl溶液中具有高的耐蚀性能。采用扫描电子显微镜(SEM)观察样品的表面形貌,发现所有样品表面受到了相同的腐蚀,而且经阳极动电位极化测试后的样品表面没有出现点蚀、裂纹或其它缺陷。使用等效电路模拟电化学阻抗谱(EIS)数据,以表征样品表面且更好地理解Mo和Ta的添加对cp-Ti及再结晶的影响。EIS结果证实,在开路电位下,所有样品在0.9%NaCl溶液(pH 2.3)中产生钝化(极化电阻约为105Ω·cm2)。在37°C时,样品在0.9%NaCl溶液中(pH 2.3)的耐蚀性顺序为:再结晶Ti12Mo5Ta>未再结晶Ti12Mo5Ta>未再结晶Ti12Mo>cp-Ti。
The electrochemical behavior of unrecrystallized and recrystallized Ti12Mo5Ta alloy, unrecrystallized Ti12Mo alloy and industrial pure titanium (cp-Ti) at 37 ° C in 0.9% physiological saline (pH 2.3) was compared. Very low passivation current densities (10-6 A / cm2) were obtained from the anodic polarization curve, indicating that all samples have high corrosion resistance in acidic 0.9% NaCl solution. Scanning electron microscopy (SEM) was used to observe the surface morphology of the samples. All the samples were found to be corroded on the same surface. No pitting, cracks or other defects were observed on the sample surface after anodic polarization testing. Electrochemical impedance spectroscopy (EIS) data were simulated using equivalent circuitry to characterize the sample surface and to better understand the effect of Mo and Ta addition on cp-Ti and recrystallization. EIS results confirmed that all samples were passivated (pH about 105Ω · cm2) in 0.9% NaCl solution (pH 2.3) at open circuit potential. At 37 ° C, the corrosion resistance of the samples in 0.9% NaCl solution (pH 2.3) was as follows: recrystallized Ti12Mo5Ta> unrecrystallized Ti12Mo5Ta> unrecrystallized Ti12Mo> cp-Ti.