Determination and explanation of the pH-related critical fluoride concentration of pure titanium in acidic solutions using electrochemical methods

doi:10.1016/j.electacta.2015.04.165

IMR OpenIR

	Determination and explanation of the pH-related critical fluoride concentration of pure titanium in acidic solutions using electrochemical methods
	Wang, Z. B.; Hu, H. X.; Zheng, Y. G.
通讯作者	Zheng, Y. G.(ygzheng@imr.ac.cn)
	2015-07-10
发表期刊	ELECTROCHIMICA ACTA
ISSN	0013-4686
卷号	170 页码:300-310
摘要	The critical fluoride concentrations for titanium were determined experimentally in acidic solutions at pH = 1.0 similar to 5.0 using open circuit potential measurements combined with potentiodynamic polarization tests. The results indicated that the dependence of the critical fluoride concentration on pH (partial derivative pF/partial derivative pH) could be classified into two pH regions: partial derivative pF/partial derivative pH = -0.17 at region I (pH = 1.0 similar to 2.5) and partial derivative pF/partial derivative pH = -0.78 at region II (pH = 3.0 similar to 5.0), respectively. Electrochemical parameters for titanium in fluoride-containing acidic solutions were obtained by analyzing the polarization curves quantitatively. It was found that hydrogen evolution reaction controlled by charge transfer, and oxygen reduction reaction controlled by mass transfer dominated the cathodic reactions at Region I and Region II, respectively. The partial derivative pF/partial derivative pH values were calculated using the obtained parameters and were in line with the experimental results. Based on the calculations, the different partial derivative pF/partial derivative pH values between Region I and Region II were mainly determined by the anodic parameter, partial derivative lgI(m)/partial derivative pH, rather than the cathodic parameters. Accordingly, anodic reaction mechanisms were proposed considering the existence forms of the fluoride. They could be fully utilized to qualitatively explain the phenomenon of pH-related critical fluoride concentration. (C) 2015 Elsevier Ltd. All rights reserved.
关键词	Titanium critical fluoride concentration pH potentiodynamic polarization anodic reaction
资助者	National Natural Science Foundation of China
DOI	10.1016/j.electacta.2015.04.165
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51131008]
WOS研究方向	Electrochemistry
WOS类目	Electrochemistry
WOS记录号	WOS:000355636100037
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/81176
通讯作者	Zheng, Y. G.
作者单位	Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Wang, Z. B.,Hu, H. X.,Zheng, Y. G.. Determination and explanation of the pH-related critical fluoride concentration of pure titanium in acidic solutions using electrochemical methods[J]. ELECTROCHIMICA ACTA,2015,170:300-310.
APA	Wang, Z. B.,Hu, H. X.,&Zheng, Y. G..(2015).Determination and explanation of the pH-related critical fluoride concentration of pure titanium in acidic solutions using electrochemical methods.ELECTROCHIMICA ACTA,170,300-310.
MLA	Wang, Z. B.,et al."Determination and explanation of the pH-related critical fluoride concentration of pure titanium in acidic solutions using electrochemical methods".ELECTROCHIMICA ACTA 170(2015):300-310.