Corrosion and passive film characteristics of 3D-printed NiTi shape memory alloys in artificial saliva  

作　　者：Ming Liu Jia-Ning Zhu V.A.Popovich E.Borisov J.M.C.Mol Y.Gonzalez-Garcia 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano),Xi’an Jiaotong University,Xi’an,710049,China [2]Department of Materials Science and Engineering,Delft University of Technology,AA Delft,2600,The Netherlands [3]Peter the Great Saint-Petersburg Polytechnic University,Saint Petersburg,195251,Russia

出　　处：《Rare Metals》2023年第9期3114-3129,共16页稀有金属（英文版）

基　　金：financially supported by the financial support from the International Postdoctoral Exchange Fellowship Program 2019 by the Office of China Postdoctoral Council (No. 20190086);the support from the Russian Science Foundation Grant (No. 19-79-30002)。

摘　　要：Electrochemical tests and surface analysis were applied to study the corrosion behavior and passive film characteristics of three-dimensional-printed NiTi shape memory alloys fabricated by laser-powder bed fusion(LPBF) in artificial saliva at 37.C. The passivity of L-PBF NiTi shows to be influenced by the process parameters and resulting morphological and physicochemical surface properties. The results show that the defects at the surface of L-PBF Ni Ti can promote the passivation rate in the early stages of exposure but a slowly formed passive film shows the best corrosion protection. The thickness of the passive film is positively correlated with its corrosion protective performance. The L-PBF NiTi alloy prepared at a linear energy density of 0.2 J·m^(-1) and volumetric energy density of 56 J·mm^(-3) shows the least defects and best corrosion protection. An outer Ti-rich and inner Ni-rich dense passive film could be also obtained showing higher corrosion resistance.

关 键 词：NITI Laser-powder bed fusion(L-PBF) Passive film Corrosion resistance Artificial saliva 

分 类 号：TP391.73[自动化与计算机技术—计算机应用技术] TG174.4[自动化与计算机技术—计算机科学与技术]