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On electrochemical techniques for interface inhibitor research
Cao, C
Corresponding AuthorCao, C()
1996-12-01
Source PublicationCORROSION SCIENCE
ISSN0010-938X
Volume38Issue:12Pages:2073-2082
AbstractThe electrochemical behavior related to different modes of inhibition effect is discussed for interface inhibitors. The action coefficients of an inhibitor on the anodic and cathodic reactions (f(a) and f(c), respectively) of a corrosion process are defined. An equation is deduced which denotes that if the inhibition effect is caused by geometrically blocking the surface of metal electrode by adsorbed inhibitive species, the corrosion potential in the inhibitor-containing solution will be nearly equal to that in the solution without the inhibitor. In this case the inhibition efficiency (eta) equals the coverage (Theta) of the adsorbed species and can be estimated by polarization resistance (R(p)) measurements. In addition, the plot of eta vs the ''relative coverage'' (mu) estimated from interfacial capacitance measurements will be a straight line through the original point of the coordinate. If the inhibition is not due to the geometric blocking effect, which can be judged by the noticeable shift of corrosion potential as the inhibitor is added into the solution, then eta cannot be estimated by R(p) and does not equal Theta. Instead, transfer resistance (R(t)) can always be employed to estimate inhibition efficiency whatever the mode of the inhibition effect. It is argued that theoretically no Tafelian straight lines can be measured in solutions with interface inhibitors unless Theta is independent of the electrode potential E or f(a), and f(c), of the inhibitor change linearly with E. Equations of faradaic admittance at the corrosion potential in inhibitor-containing solution for different modes of inhibition effect are deduced. In addition to the estimation of R(t), R(p) and interfacial capacitance, information on the adsorption of the inhibitive species can also be gathered by EIS measurement. In the case of the geometric blocking effect, the EIS display in the inhibitor-containing solution will be similar to that in the black solution when eta is low, while a single capacitive loop will display when eta is high. If the inhibition is not due to the geometric blocking effect, two time constants will be involved in the EIS display measured in the inhibitive-containing solution no matter what the displays of EIS in the blank solution are, and in this case the effect of E on Theta can be predicted based on the EIS and polarization curve measurements. Copyright (C) 1996 Elsevier Science Ltd
Keywordacid inhibition
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:A1996VZ92800001
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:284[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/126721
Collection中国科学院金属研究所
Corresponding AuthorCao, C
AffiliationCHINESE ACAD SCI,INST CORROS & PROTECT MET,KEY STATE LAB CORROS & PROTECT,62 WENCUI RD,SHENYANG 110015,PEOPLES R CHINA
Recommended Citation
GB/T 7714
Cao, C. On electrochemical techniques for interface inhibitor research[J]. CORROSION SCIENCE,1996,38(12):2073-2082.
APA Cao, C.(1996).On electrochemical techniques for interface inhibitor research.CORROSION SCIENCE,38(12),2073-2082.
MLA Cao, C."On electrochemical techniques for interface inhibitor research".CORROSION SCIENCE 38.12(1996):2073-2082.
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