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J Chin Soc Corr Pro  2009, Vol. 29 Issue (3): 215-219    DOI:
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CORROSION BEHAVIOR OF LY12 ALUMINUM ALLOY WITH CYCLIC IMMERSION CORROSION TEST
FAN Lin1; CAI Jianping2; ZHANG Qi1
1. College of Materials Science and Technology; Beihang University;Beijing 100083
2. Beijing Institute of Aeronautical Materials; Beijing 100095
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Abstract  

The corrosion behavior of LY12 aluminum alloy was studied with cyclic immersion test, associated with electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) equipped with energy dispersive analysis system of X-ray (EDAX) examination. The results showed that the corrosion of LY12 aluminum alloy started from pitting, and then to intergranular corrosion and exfoliation. EIS is comprised by three capacitive curves at high-mediate frequency and a shrinking inductive curve at low frequency. Some information about the corrosion mechanism, such as corrosion development rate, corrosion morphology,the variation of the interface and the protection of the corrosion product, can be obtained through the simulated EIS data combined with the analysis of the corrosion kinetics and the corrosion product.

Key words:  LY12 aluminum alloy      corrosion mechanism      cyclic immersion test      electrochemical impedance spectroscopy     
Received:  16 August 2007     
ZTFLH: 

TG172.3

 
Corresponding Authors:  FAN Lin     E-mail:  violin\_fl@163.com

Cite this article: 

FAN Lin CAI Jianping ZHANG Qi. CORROSION BEHAVIOR OF LY12 ALUMINUM ALLOY WITH CYCLIC IMMERSION CORROSION TEST. J Chin Soc Corr Pro, 2009, 29(3): 215-219.

URL: 

https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2009/V29/I3/215

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