STUDY ON EVALUATION FOR UNDER-FILM CORROSION OFCOATED 2024T3 ALUMINUM ALLOY WITH EIS BY TIME DOMAIN METHOD

J Chin Soc Corr Pro

2002, Vol. 22

Issue (1): 8-13 DOI:

Research Report

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STUDY ON EVALUATION FOR UNDER-FILM CORROSION OFCOATED 2024T3 ALUMINUM ALLOY WITH EIS BY TIME DOMAIN METHOD

Yanling Hu;Di Li;Baolan Guo

北京航空航天大学材料工程系

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Abstract In this article,EIS by Laplace transform time domai n method was used to evaluate under-film corrosion of coated 2024T3 aluminum all oy.EXCO immersion test,optical microscope observation and statistic method were also employed. Results show that EIS by time domain method is a quick,nondestructive and quanti tative method to detect under-film corrosion of 2024T3 Al alloy.The low frequenc y impedance (Rd),high frequency capacitance (Cg) can be treated as i ndicators of under-film corrosion.Correlation was established between Rd a nd Cg and corrosion states.Statistical analysis show that log(Rd) ma tch Gumbel distribution and log(Cg) correspond to normal distribution. Investigations show that different corrosion states have different dynamic rules .If only pitting occurs on the specimen,Rd and Cg fluctuates.When th e exfoliation happens,Rd will decrease and Cg will increase with tim e.Log(Rd),which reflect the most severe corrosion in large-scale specimen, will decrease exponentially with time in EXCO solution.

Key words: aluminum alloy coating corrosion electrochemical imped ance spectroscopy statistics

Received: 20 September 2000

ZTFLH:	TG174.3
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Corresponding Authors: Yanling Hu

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Yanling Hu; Di Li; Baolan Guo. STUDY ON EVALUATION FOR UNDER-FILM CORROSION OFCOATED 2024T3 ALUMINUM ALLOY WITH EIS BY TIME DOMAIN METHOD. J Chin Soc Corr Pro, 2002, 22(1): 8-13 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I1/8

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