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In-situ monitoring of the electrochemical behavior of cellular structured biomedical Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid
Gai, Xin1,2; Bai, Yun1; Li, Shujun1; Hou, Wentao1; Hao, Yulin1; Zhang, Xing1; Yang, Rui1; Misra, R. D. K.3
Corresponding AuthorBai, Yun(ybai@imr.ac.cn) ; Li, Shujun(shjli@imr.ac.cn) ; Misra, R. D. K.(dmisra2@utep.edu)
2020-04-01
Source PublicationACTA BIOMATERIALIA
ISSN1742-7061
Volume106Pages:387-395
AbstractTi-6Al-4V alloys with cellular structure fabricated by additive manufacturing are currently of significant interest because their modulus is comparable to bone and the cellular structure allows the cells to penetrate and exchange nutrients, promoting osseointegration. We describe here a unique simulation device that replaces the traditional steady electrochemistry approach, enabling in-situ study of variation of ion concentration and surface potential with pore depth for cellular structured Ti-6Al-4V alloys fabricated by electron beam melting (EBM) in phosphate buffered saline (PBS). This approach addresses the scientific gap on the electrochemical behavior of cellular structured titanium alloys. The study indicated that concentration of H+ and Cl- increased with the increase of pore depth, while the surface potential decreased. The exposed surface of inner cellular structure was not corroded but passivated after immersing in PBS at 37 degrees C for 14 days, which was independent of pore depth. Furthermore, X-ray photoelectron spectroscopy (XPS) and Mott-Schottky (M-S) studies suggested that a thinner passive film containing a greater donor density was formed on the surface of cellular structured Ti-6Al-4V alloy at the deepest pore depth. This is attributed to insufficient oxygen supply and Cl adsorption on the surface inside the pores. Statement of Significance Porous titanium alloys are promising implants in biomedical applications. However, it is a challenge to accurately characterize the corrosion behavior of porous titanium alloys with complex pore structure using traditional electrochemical methods. In this study, we have adopted a special device to simulate the environment within the pore structure. The variation in ion concentration and surface potential of Ti-6Al-4V fabricated by EBM with pore depth was in-situ monitored. After immersing in PBS for 14 days, Ti-6Al-4V exhibited good corrosion properties and the samples with less than 60 mm pore depth were not corroded but passivated. Also, we analyzed the difference in corrosion property at different pore depth. This type of in-situ corrosion performance monitoring in EBM-produced Ti-6Al-4V has not been previously studied. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordCellular structure Titanium alloy Electron beam melting Passive film Corrosion resistance
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS
DOI10.1016/j.actbio.2020.02.008
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFC1104903] ; National Key Research and Development Program of China[2016YFC1100502] ; National Key Research and Development Program of China[2016YFC1102601] ; National Natural Science Foundation of China[51631007] ; National Natural Science Foundation of China[51501200] ; National Natural Science Foundation of China[51871220] ; Key Research Program of Frontier Sciences, CAS[QYZDJ-SSW-JSC031-02]
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Biomedical ; Materials Science, Biomaterials
WOS IDWOS:000527368300031
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138394
Collection中国科学院金属研究所
Corresponding AuthorBai, Yun; Li, Shujun; Misra, R. D. K.
Affiliation1.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Univ Texas El Paso, Dept Met Mat & Biomed Engn, 500W Univ Ave, El Paso, TX 79968 USA
Recommended Citation
GB/T 7714
Gai, Xin,Bai, Yun,Li, Shujun,et al. In-situ monitoring of the electrochemical behavior of cellular structured biomedical Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid[J]. ACTA BIOMATERIALIA,2020,106:387-395.
APA Gai, Xin.,Bai, Yun.,Li, Shujun.,Hou, Wentao.,Hao, Yulin.,...&Misra, R. D. K..(2020).In-situ monitoring of the electrochemical behavior of cellular structured biomedical Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid.ACTA BIOMATERIALIA,106,387-395.
MLA Gai, Xin,et al."In-situ monitoring of the electrochemical behavior of cellular structured biomedical Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid".ACTA BIOMATERIALIA 106(2020):387-395.
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