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STUDY ON EVALUATION FOR UNDER-FILM CORROSION OFCOATED 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 (Rd),high frequency capacitance (Cg) can be treated as i ndicators of under-film corrosion.Correlation was established between Rd a nd Cg and corrosion states.Statistical analysis show that log(Rd) ma tch Gumbel distribution and log(Cg) correspond to normal distribution.
Investigations show that different corrosion states have different dynamic rules .If only pitting occurs on the specimen,Rd and Cg fluctuates.When th e exfoliation happens,Rd will decrease and Cg will increase with tim e.Log(Rd),which reflect the most severe corrosion in large-scale specimen, will decrease exponentially with time in EXCO solution.
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Received: 20 September 2000
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Corresponding Authors:
Yanling Hu
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