激光快速成形钛的耐应力腐蚀及耐电化学腐蚀性能研究  

Stress and electrochemical corrosion of titanium produced by laser rapid forming

作　　者：朱娟芳[1,2] 甘抗 杜田丰[2] 高勃[1] Zhu Juanfang;Gan Kang;Du Tianfeng;Gao Bo

机构地区：[1]第四军医大学口腔医学院口腔修复科军事口腔医学国家重点实验室口腔疾病国家临床医学研究中心陕西省口腔医学重点实验室,西安710032 [2]郑州大学第一附属医院口腔医学中心,450052

出　　处：《中华口腔医学杂志》2019年第4期257-262,共6页Chinese Journal of Stomatology

基　　金：国家重点研发计划(2018YFB1106902).

摘　　要：目的探讨激光快速成形(laser rapid forming,LRF)钛的耐应力腐蚀和耐电化学腐蚀性能,以期为LRF钛的临床应用提供参考。方法以锻造纯钛为对照组,LRF纯钛为LRF组。两组试件置于酸性含氟溶液(pH=3)中,分别进行1.2×σ0.2 Pa(σ0.2为材料的屈服强度)的应力加载,通过肉眼观察、X射线衍射分析和扫描电镜观察,分析浸泡30 d时两组钛试件的耐应力腐蚀性能。两组试件分别置于人工唾液(pH=7)、中性含氟溶液(pH=7)及酸性含氟溶液(pH=3)中(每组每种腐蚀介质4个试件),通过极化曲线分析腐蚀电位(corrosion potential,Ecorr)、腐蚀电流密度(corrosion current,Icorr)等参数,评价两组钛试件的耐电化学腐蚀性能。结果随着浸泡时间的延长,两组钛试件应力腐蚀产物均逐渐增加;对照组应力腐蚀明显多于LRF组,且点蚀直径明显大于LRF组。人工唾液、中性含氟溶液和酸性含氟溶液中LRF组Ecorr均值(分别为-469、-925和-943 mV)均大于对照组(分别为-555、-943和-956 mV)。同组Ecorr均值均为在人工唾液中最高,在酸性含氟溶液中最低;同组Icorr均值均为在人工唾液中最小,在酸性含氟溶液中最大。结论在相同腐蚀介质中LRF钛的耐应力腐蚀和耐电化学腐蚀性能均优于锻造钛,更适用于人体植入领域。Objective To investigate the stress corrosion and electrochemical corrosion resistance of titanium produced through laser rapid forming (LRF), and to provide a basis for their clinical application. Methods Forged commercial pure titanium (CP-Ti) was used as control group and LRF pure titanium was used as LRF group. All samples were placed in acidic artificial saliva containing fluorine (pH=7), and loaded with a stress of 1.2 ×σ0.2 Pa (σ0.2 represents the yield strength of material). Stress corrosion resistance of specimens that have been soaked for 30 days was analyzed by naked eye observation, X-ray diffraction analysis and scanning electron microscopy. For samples placed in artificial saliva, neutral fluoride solution (pH=7) and acidic fluoride solution (pH=3)(4 test pieces in each corrosive medium), and their electrochemical corrosion resistance was evaluated by free corrosion potential (Ecorr) measurements, corrosion current (Icorr), electrochemical impedance spectroscopy (EIS), and anodic polarization curves. Results With the prolongation of immersion time, the corrosion products gradually increased. The stress corrosion of CP-Ti group was significantly more than that of LRF-Ti group, and the pit diameter was significantly larger than that of LRF-Ti group. The electrochemical corrosion results showed that the Ecorr (-469 mV) of LRF-Ti in artificial saliva was higher than that of CP-Ti (-555 mV), and the Ecorr (-925 mV) of LRF-Ti was higher than that of CP-Ti (-943 mV) in neutral fluoride solution. In acid fluoride solution, the Ecorr (-943 mV) of LRF-Ti was higher than that of CP-Ti (-956 mV). The Ecorr of the same metal was the highest in artificial saliva and the lowest in acid fluoride solution;the Icorr of the same metal was the lowest in artificial saliva and the highest in acid fluoride solution. Conclusions Under the same corrosion conditions, LRF Ti demonstrated better stress and electrochemical corrosion resistance than CP-Ti.

关 键 词：钛 腐蚀 牙种植体 电化学 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.23[一般工业技术—材料科学与工程]