激光喷丸医用Ti6Al4V合金的耐生物腐蚀性能研究

发布时间：2018-03-12 16:27

本文选题：激光技术　切入点：TiAlV合金　出处：《中国激光》2017年07期 　论文类型：期刊论文

【摘要】：为研究激光喷丸强化对医用Ti6Al4V合金表面耐生物腐蚀性能的影响,对Ti6Al4V合金试样表面进行激光喷丸强化处理;然后选用动电位极化曲线测试法研究了激光喷丸前后试样的电化学腐蚀性能,采用扫描电子显微镜观察腐蚀试样的表面形貌并进行能谱分析。结果表明,在测试参数范围内,激光喷丸强化试样的自腐蚀电位正移,腐蚀倾向降低;钝化电流密度降低,钝化区电位范围增大,钝化性能更稳定;击穿电位正移,点蚀敏感性降低;自腐蚀电流密度减小,腐蚀速率降低。与未处理试样相比,自腐蚀电位最大正移了0.209V,钝化电流密度最大降低了2个数量级,钝化区电位范围最大增幅为86.90%,击穿电位最大增幅为88.31%,自腐蚀电流密度最大降低了81.75%。激光喷丸强化处理可有效改善医用Ti6Al4V合金表面的耐生物腐蚀性能。
[Abstract]:In order to study the effect of laser shot peening on the surface corrosion resistance of medical Ti6Al4V alloy, the surface of Ti6Al4V alloy was treated by laser shot peening. Then the electrochemical corrosion properties of the samples before and after laser shot peening were studied by potentiodynamic polarization curve method. The surface morphology of the samples was observed by scanning electron microscope (SEM) and the energy spectrum analysis was carried out. The results show that, in the range of test parameters, The self-corrosion potential of laser shot peening strengthened sample is positive shift, corrosion tendency is decreased, passivation current density is decreased, potential range of passivation zone is increased, passivation performance is more stable, breakdown potential is positive shift, pitting corrosion sensitivity is decreased, and self-corrosion current density is decreased. Compared with the untreated sample, the maximum corrosion potential shifted positively by 0.209 V, and the passivation current density decreased by two orders of magnitude. The maximum range of potential in passivation region is 86.90, the maximum increase of breakdown potential is 88.31, the maximum current density of self-corrosion decreases 81.75.The surface corrosion resistance of medical Ti6Al4V alloy can be improved effectively by laser shot peening.
【作者单位】：江苏大学机械工程学院;江苏科技大学机械工程学院;
【基金】：国家自然科学基金(51575247,51405207) 中国博士后科学基金(2014T70477,2013M540417) 江苏省自然科学青年基金(BK20140510) 江苏省重点实验室开放课题(JSKLEDC201501)
【分类号】：TG146.23;TG668;TN249

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