3D打印NiTi形状记忆合金在模拟不同口腔环境中电化学腐蚀行为研究  

Electrochemical Corrosion Behavior of 3D-printed NiTi Shape Memory Alloy in a Simulated Oral Environment

作　　者：刘明 王杰 朱春晖[3] 张延晓 LIU Ming;WANG Jie;ZHU Chunhui;ZHANG Yanxiao(State Key Laboratory of Strength of Metal Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Shaanxi Zhou Doctor Dental Medical Co.,Ltd.,Xi'an 710086,China;Department of Periodontology,College of Stomatology,Xi'an Jiaotong University,Xi'an 710004,China;Department of Orthodontic,Wuxi Hospital of Stomatology,Wuxi 214000,China)

机构地区：[1]西安交通大学材料科学与工程学院金属材料强度国家重点实验室,西安710049 [2]陕西周医生口腔医疗有限公司,西安710086 [3]西安交通大学口腔医院牙周科,西安710004 [4]无锡口腔医院口腔正畸科,无锡214000

出　　处：《中国腐蚀与防护学报》2023年第4期781-786,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：陕西省自然科学基金(2019JQ-609)。

摘　　要：采用测量开路电位、极化曲线、电化学阻抗谱和Mott-Schottky方法研究了3D打印NiTi合金在不同人工唾液环境中的电化学腐蚀行为。结果表明,在纯人工唾液环境中,随着浸泡时间的延长,3D-NiTi合金的开路电位正移,合金的热力学稳定性提高,合金表现为典型的金属钝化极化特征,在人工唾液中可形成耐蚀稳定的钝化膜。添加可乐后,合金的热力学稳定性降低,极化曲线向左下方移动,自腐蚀电位负移,自腐蚀电流密度增大。添加1%NaF后,合金的热力学稳定性急剧降低,表现为活化腐蚀状态,钝化膜的缺陷数增加了3.7倍,F-可极大地破坏钝化膜的完整性。The electrochemical corrosion behavior of 3D-printed NiTi shape memory alloy in various types of artificial saliva was studied by means of open circuit potential measurement,polarization curve,electrochemical impedance spectroscopy and Mott-Schottky.The results show that with the increasing time of immersion in an artificial saliva,the open circuit potential of 3D-NiTi alloy shifted positively,while the thermodynamic stability of the alloy is improved.The alloy exhibited typical passivation characteristics,and the corrosion resistant and stable passive film might form.After Coke was added to the artificial saliva,the thermodynamic stability of the alloy decreased,the polarization curve moved to the lower left,the free-corrosion potential shifted negatively,and the corresponding corrosion current density increased.After adding 1%NaF,the thermodynamic stability of the alloy decreases sharply,showing an active corrosion state.The number of defects of the passive film increases 3.7 times,and F-can greatly damage the integrity of the passive film.

关 键 词：3D-NiTi 人工唾液 可口可乐 F- 电化学阻抗谱 

分 类 号：TG174[金属学及工艺—金属表面处理]