STUDY ON ATMOSPHERIC CORROSION OF LOW ALLOY STEEL

J Chin Soc Corr Pro

2004, Vol. 24

Issue (3): 147-154 DOI:

Research Report

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STUDY ON ATMOSPHERIC CORROSION OF LOW ALLOY STEEL

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Abstract The corrosion of 7 kinds of mild steel and low alloy steelin immersion-wet-dry cycle test environment and the electrochemical feature of rusted metals after test were studied by using EIS and SEM et al.The solution containing HSO-3 and Cl-,was used for wetting and immersion specimens at circumstance emperature 40℃ for 4 min respectively.The drying cycle was maintained for 12 min at temperature 12℃.The results indicated that,the weight loss all followed exponential decay function:Y=Y0+Ae-t/B.The corrosion rate of mild steel was 2.49 times than that of the most corrosion resistant low alloy after 120 h test.The results of electrochemical measurement showed that,the further corrosion rate would be controlled by cathodic diffusion process.The impedance of 7 kinds of steels after corrosion test was linear with the annual corrosion rate.

Key words: steel low alloy steel atmospheric corrosion

Received: 29 September 2002

ZTFLH:

TG172.3

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. STUDY ON ATMOSPHERIC CORROSION OF LOW ALLOY STEEL. J Chin Soc Corr Pro, 2004, 24(3): 147-154 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I3/147

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