In-situ monitoring of the electrochemical behavior of cellular structured biomedical Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid

doi:10.1016/j.actbio.2020.02.008

IMR OpenIR

	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, Xin 1,2; Bai, Yun 1; Li, Shujun 1; Hou, Wentao 1; Hao, Yulin 1; Zhang, Xing 1; Yang, Rui 1; Misra, R. D. K.3
通讯作者	Bai, Yun(ybai@imr.ac.cn) ; Li, Shujun(shjli@imr.ac.cn) ; Misra, R. D. K.(dmisra2@utep.edu)
	2020-04-01
发表期刊	ACTA BIOMATERIALIA
ISSN	1742-7061
卷号	106 页码:387-395
摘要	Ti-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.
关键词	Cellular structure Titanium alloy Electron beam melting Passive film Corrosion resistance
资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS
DOI	10.1016/j.actbio.2020.02.008
收录类别	SCI
语种	英语
资助项目	National 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研究方向	Engineering ; Materials Science
WOS类目	Engineering, Biomedical ; Materials Science, Biomaterials
WOS记录号	WOS:000527368300031
出版者	ELSEVIER SCI LTD
引用统计	被引频次：33[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/138397
专题	中国科学院金属研究所
通讯作者	Bai, Yun; Li, Shujun; Misra, R. D. K.
作者单位	1.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
推荐引用方式 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.