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

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.; ygzheng@imr.ac.cn
	2015
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.
部门归属	[wang, z. b. ; hu, h. x. ; zheng, y. g.] chinese acad sci, inst met res, key lab nucl mat & safety assessment, shenyang 110016, peoples r china
关键词	Titanium Critical Fluoride Concentration Ph Potentiodynamic Polarization Anodic Reaction
资助者	National Natural Science Foundation of China [51131008]
收录类别	sci
语种	英语
WOS记录号	WOS:000355636100037
引用统计	被引频次：41[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/321006/74715
专题	中国科学院金属研究所
通讯作者	ygzheng@imr.ac.cn
推荐引用方式 GB/T 7714	Wang, Z. B.,Hu, H. X.,Zheng, Y. G.,et al. 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.,&ygzheng@imr.ac.cn.(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.