ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF Al ALLOYS DURING EXFOLIATION CORROSION

J Chin Soc Corr Pro

2005, Vol. 25

Issue (1): 48-52 DOI:

Research Report

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ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF Al ALLOYS DURING EXFOLIATION CORROSION

Jinfeng Li;Ziqiao Zheng;Zhao Zhang;Jianqing Zhang

中南大学材料科学与工程学院

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Abstract The exfoliation development of 8090 Al - Li alloy and 7050 Al alloy was studied.The electrochemical impedance spectroscopy(EIS) of these alloys in EXCO solution was measured and simulated .At the beginning of immersion, the EIS is comprised by a capacitive arc at high - mediate frequency and an inductive arc at mediate - low frequency. Once exfoliation occurs, two capacitive arcs appear at high - mediate frequency and mediate - low frequency respectively.Some information about exfoliation, such as exfoliation development rate and exfoliation morphology, can be obtained through the simulated EIS data.

Key words: Al alloys electrochemical impedance spectroscopy (EIS) exfoliation corrosion

Received: 07 July 2003

ZTFLH:	TG174.3
	O646

Corresponding Authors: Jinfeng Li E-mail: jfli2000@163.net

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Jinfeng Li; Ziqiao Zheng; Zhao Zhang; Jianqing Zhang. ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF Al ALLOYS DURING EXFOLIATION CORROSION. J Chin Soc Corr Pro, 2005, 25(1): 48-52 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I1/48

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