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Citation: Shao Hai-Bo, Zhang Jian-Qing, Wang Jian-Ming, Cao Chu-Nan. EIS Analysis on the Anodic Dissolution Process of Pure Aluminum in an Alkaline Solution[J]. Acta Physico-Chimica Sinica, ;2003, 19(04): 372-375. doi: 10.3866/PKU.WHXB20030420 shu

EIS Analysis on the Anodic Dissolution Process of Pure Aluminum in an Alkaline Solution

1.
Department of Chemistry, Zhejiang University, Hangzhou　310027; State Key Laboratory of Corrosion and Protection, Shenyang　110015

Received Date: 9 July 2002
Available Online: 15 April 2003

The EIS of the anodic dissolution process of pure aluminum in an alkaline solution was fitted using an expression of Faradic admittance previously proposed by Cao[11-12], based on which the mechanism of the process was proposed. The results show that the capacitive loop in low frequency region of EIS is caused by the reaction of Al (ss), and the inductive loop in middle frequency region is caused by the reaction of Al(OH)ads. The time constants of Faradic admittance τ1 and τ2 mean the converting time of unit species Al(ss) and Al(OH)ads on unit bare surface site. Generally, τ1 and τ2 both decrease with the increase of the potential E.τ1 >0, τ2 >0, satisfy the conditions required by stability, and by Kramers-Kronig transforms as well. g1 and g2 relate to the variation of covering density of reactants Al(ss) and Al(OH)ads. g1< 0 indicates that the aluminum surface tends to be passive when the potential increases.
- Pure aluminum;Alkaline solution;Anodic dissolution;Electrical impedance spectrum (EIS);Analysis
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