CREVICE CORROSION OF LOW ALLOY STEEL AND CARBON STEEL IN THE SIMULATED GROUNDWATER AT 90 ℃

doi:10.3724/SP.J.1037.2014.00027

Acta Metall Sin

2014, Vol. 50

Issue (6): 659-666 DOI: 10.3724/SP.J.1037.2014.00027

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CREVICE CORROSION OF LOW ALLOY STEEL AND CARBON STEEL IN THE SIMULATED GROUNDWATER AT 90 ℃

XU Qiufa, PANG Xiaolu, LIU Quanlin, GAO Kewei(

)

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

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XU Qiufa, PANG Xiaolu, LIU Quanlin, GAO Kewei. CREVICE CORROSION OF LOW ALLOY STEEL AND CARBON STEEL IN THE SIMULATED GROUNDWATER AT 90 ℃. Acta Metall Sin, 2014, 50(6): 659-666.

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Abstract

Carbon steel and low alloy steel as candidates of high-level radioactive waste packaging materials,will undergo groundwater corrosion during long term disposal in underground repository, so it is necessary to study the corrosion behaviors of carbon steel and low alloy steel in the specific environment. Crevice corrosion behaviors of carbon steel Q235 and low alloy weathering steel Corten A were studied in a simulated groundwater at 90 ℃ through immersion tests and electrochemical measurements. SEM, EDS and Raman spectra were employed to analyze the corrosion product scales. The results show that both steels occured crevice corrosion and the crevice corrosion depth increased with corrosion time. Corten A underwent more serious crevice corrosion than Q235. In neutral or acidic solution, the corrosion resistance of Corten A was superior to Q235, but when the pH value of the solution was lower than 1, Corten A exhibited lower corrosion resistance than Q235. The alloying elements Cr, Cu and Si in Corten A were harmful to the resistance to crevice corrosion in the solution.

Key words: high-level radioactive waste groundwater low alloy steel carbon steel crevice corrosion

Received: 13 January 2014

ZTFLH:

TG172.3

Fund: Supported by National Natural Science Foundation of China (No.51271024)

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	Qiufa XU
	Xiaolu PANG
	Quanlin LIU
	Kewei GAO

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2014.00027 OR https://www.ams.org.cn/EN/Y2014/V50/I6/659

Table 1 Chemical compositions of Q235 and Corten A

(mass fraction / %)

Fig.1 Microstructures of carbon steel Q235 (a) and low alloy steel Corten A (b)

Fig.2 Morphologies of Q235 (a, c, e) and Corten A (b, d, f) crevice after corrosion product removal at corrosion times of 30 d (a, b), 90 d (c, d) and 180 d (e, f)

Fig.3 SEM morphologies of Q235 (a, c, e) and Corten A (b, d, f) inside crevice after corrosion product removal at corrosion times of 30 d (a, b), 90 d (c, d) and 180 d (e, f)

Fig.4 Crevice depth of the two steels at different corrosion times

Fig.5 Morphologies of the corrosion scales on Q235 (a) and Corten A (b) after corrosion for180 d

Fig.6 Raman spectra of corrosion scales on the two steels inside crevice after corrosion for 180 d

Fig.7 Morphologies of corrosion scales (left) and corresponding EDS analysis (right) on Q235 (a) and Corten A (b) inside crevice after corrosion for 180 d

Fig.8 Low (a) and high (b~f) enlarged SEM images of corrosion scales for different areas on the Corten A inside crevice after corrosion for 180 d

Fig.9 Polarization curves of the two steels in the deaerated groundwater with different pH

Table 2 EDS analyses of areas 1~5 in Figs.8d~f

(mass fraction / %)

Table 3 Potentiodynamic polarization test results of the two steels in the deaerated groundwater with different pH

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