酸蚀时间对喷砂后TC4钛合金表面形貌及抗腐蚀性的影响

发布时间：2018-03-22 10:52

本文选题：钛合金　切入点：植入体　出处：《山东大学学报(工学版)》2017年03期 　论文类型：期刊论文

【摘要】：为研究喷砂酸蚀表面改性方法中酸蚀时间对喷砂后TC4钛合金表面形貌和抗腐蚀性的影响,采用220目的Al_2O_3颗粒对钛合金表面进行喷砂处理,然后对喷砂后的样品在HCl/H_2SO_4混合酸液中分别酸蚀不同的时间(0.5、1、2、3 h),并以抛光组为对照。通过扫描电子显微镜(scanning electron microscopy,SEM)和3D共聚焦显微镜对各组钛片的表面形貌进行表征和表面粗糙度测量。然后运用电化学工作站对各组样品进行耐腐蚀性试验,以评价各组样品的腐蚀行为。试验结果表明,随酸蚀时间的延长,钛合金表面形貌由杂乱趋于均匀化,粗糙度呈现先升后降趋势。2 h时粗糙度达到峰值,表面微孔比例最高,界面扩展面积比达222%。在抗腐蚀性能方面,所有喷砂酸蚀组抗腐蚀性均优于抛光组,表明喷砂酸蚀处理有助于生成腐蚀保护作用更强的氧化膜,且随时间延长,腐蚀倾向减小,3 h时最优。
[Abstract]:In order to study the effect of etching time on the surface morphology and corrosion resistance of TC4 titanium alloy after sand blasting, 220 Al_2O_3 particles were used to blast the surface of titanium alloy. Then, the surface morphology of each group was characterized by scanning electron microscopy-SEM and 3D confocal microscopy by scanning electron microscope (SEM) and 3D confocal microscope (SEM). The samples were corroded at different time of 0.5 ~ 1 ~ 2 ~ 2h ~ (-1) ~ 2h ~ (-1) in HCl/H_2SO_4 mixed acid solution and compared with polishing group (n = 10). The surface morphology of titanium was characterized by scanning electron microscopy (SEM) and 3D confocal microscopy (3D confocal microscope). And surface roughness measurements. Corrosion resistance tests were performed on each group of samples using an electrochemical workstation. The corrosion behavior of each group of samples was evaluated. The results showed that the surface morphology of titanium alloy tended to homogenize with the prolongation of acid etching time, the roughness of titanium alloy reached its peak value when the roughness increased first and then dropped at .2 h, and the ratio of surface micropores was the highest. The corrosion resistance of all sandblasting acid corrosion groups is better than that of polishing group, indicating that sandblasting acid corrosion treatment contributes to the formation of oxide films with stronger corrosion protection, and the corrosion resistance increases with time. When the corrosion tendency is reduced for 3 h, the optimum condition is obtained.
【作者单位】：山东大学高效洁净机械制造教育部重点实验室;
【基金】：国家自然科学基金资助项目(51575320)
【分类号】：R318.08;TG178

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