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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。
In order to study the effect of laser shot peening on the biocorrosion resistance of the medical Ti6Al4V alloy surface, the surface of the Ti6Al4V alloy was treated by laser peening. Then the potentiodynamic polarization curve of the sample was used to study the effect of laser peening Chemical corrosion properties, the surface morphology of the corroded sample was observed with a scanning electron microscope and energy spectrum analysis was performed. The results show that the self-corrosion potentials of laser shot peening specimens are positive and the corrosion tendency is decreased within the range of the test parameters; the passivation current density is reduced, the passivation region potential range is increased, the passivation performance is more stable; The sensitivity of pitting decreases, the corrosion current density decreases and the corrosion rate decreases. Compared with the untreated sample, the maximum corrosion potential was shifted by 0.209V and the maximum passivation current density was reduced by two orders of magnitude. The maximum increase of the potential range of the passivation region was 86.90% and the maximum increase of the breakdown potential was 88.31% The maximum corrosion current density is reduced by 81.75%. Laser shot peening can effectively improve the biocorrosion resistance of medical Ti6Al4V alloy surface.