CREVICE CORROSION BEHAVIORS OF Q235 WELD JOINT

doi:10.11900/0412.1961.2014.00188

Acta Metall Sin

2014, Vol. 50

Issue (11): 1319-1326 DOI: 10.11900/0412.1961.2014.00188

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CREVICE CORROSION BEHAVIORS OF Q235 WELD JOINT

YU Qiaohong, LIU Chao, PANG Xiaolu, LIU Quanlin, GAO Kewei(

)

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

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YU Qiaohong, LIU Chao, PANG Xiaolu, LIU Quanlin, GAO Kewei. CREVICE CORROSION BEHAVIORS OF Q235 WELD JOINT. Acta Metall Sin, 2014, 50(11): 1319-1326.

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Abstract

As a candidate package material for high level radiation waste disposal, the crevice corrosion behavior of Q235 low carbon steel weld joint was investigated in a solution simulated to the groundwater in the northwest part of China. The influences of temperature and oxygen content were evaluated. The microstructure of the weld joint was observed by OM, and SEM and surface profile were employed to analyze the crevice corrosion behavior of the weld joint. Open circuit potential of different regions of the weld joint was measured by electrochemical method. Experimental results indicated that the increases of temperature and oxygen content could promote the occurrence of crevice corrosion, and facilitate the corrosion processes both inside and outside the crevice. Fusion zone with a microstructure of clustered ferrite was the most severe corroded area in the weld joint, followed by weld metal, which was characterized by a coarse widmanstaetten structure. The microstructures of base metal and heat affected zone were fine and homogeneous, so these two regions underwent slighter corrosion.

Key words: Q235 weld joint crevice corrosion temperature oxygen microstructure

Received: 09 August 2014

ZTFLH:

TG172.3

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

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	Articles by authors
	Qiaohong YU
	Chao LIU
	Xiaolu PANG
	Quanlin LIU
	Kewei GAO

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00188 OR https://www.ams.org.cn/EN/Y2014/V50/I11/1319

Fig.1 Metallographic structures of different regions of Q235 weld joint

Fig.2 Macro morphologies of Q235 weld joint with corrosion product removal after immersing for 30 d (a, b), 90 d (c, d) and 180 d (e, f) in the aerated (a, c, e) and deaerated (b, d, f) simulated groundwater at 90 ℃ (BM—base metal, WM—weld metal, IC—inside crevice, OC—outside crevice, CE—around crevice edge)

Table 1 Corrosion depths of Q235 weld joint after immersing for different times in the aerated and deaerated simulated groundwater at 90 ℃

Fig.3 Macro morphologies of Q235 weld joint with product removal after immersing for 180 d in the aerated (a) and deaerated (b) simulated groundwater at 25 ℃

Fig.4 Crevice corrosion depths of Q235 weld joints after immersing for 180 d in the aerated (a) and deaerated (b) simulated groundwater at 25 ℃ (The curves 1~4 are measured across the direction of lines 1~4 in Fig.3 respectively)

Table 2 Corrosion depths of Q235 weld joint after immersing for 180 d in the aerated and deaerated simulated groundwater at 25 and 90 ℃

Fig.5 SEM images of Q235 weld joint inside the crevice after immersing for 30 d (a) and 90 d (b, c, d) in the aerated simulated groundwater at 90 ℃

Fig.6 SEM images of weld metal (a, c) and base metal (b, d) of Q235 weld joint inside the crevice after immersing for 90 d (a, b) and 180 d (c, d) in the deaerated simulated groundwater at 90 ℃

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