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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
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume170Pages:300-310
AbstractThe 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.
description.department[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
KeywordTitanium Critical Fluoride Concentration Ph Potentiodynamic Polarization Anodic Reaction
Funding OrganizationNational Natural Science Foundation of China [51131008]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74715
Collection中国科学院金属研究所
Corresponding Authorygzheng@imr.ac.cn
Recommended Citation
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.
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