Electrochemical Corrosion Behavior in Seawater of Weld Joints of CCSE40 Steel Prepared by Underwater WetWelding with Austenitic Welding Rod

doi:10.11902/1005.4537.2015.206

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (5): 427-432 DOI: 10.11902/1005.4537.2015.206

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Electrochemical Corrosion Behavior in Seawater of Weld Joints of CCSE40 Steel Prepared by Underwater WetWelding with Austenitic Welding Rod

Qiang BAI^1,²,Yan ZOU²(

),Xiangfeng KONG²,Yang GAO²,Yan LIU²,Sheng DONG¹

1. College of Engineering, Ocean University of China, Qingdao 266100, China
2. Shandong Provincial Key Laboratory of Ocean Environment Monitoring Technology, Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao 266001, China

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Abstract

The electrochemical corrosion behavior in seawater of weld joints of a high strength low-alloy steel CCSE40, which were prepared by underwater wet welding with austenitic welding rod, was studied by electrochemical methods and metallurgical microscopy. Results indicated that, in the initial immersion stage, the heat affected zone had the highest corrosion rate; and with the increasing immersion time, the corrosion rate of base metal became the highest. The reason was related to the formation of the corrosion products that in the initial stage of immersion, the corrosion product layer was thin and loose, which thus had little influence on the diffusion of dissolved oxygen, thereby the heat affected zone was easy to be corroded. After a period of immersion, the corrosion product layer on the heat affected zone was dense, which could hinder the diffusion of dissolved oxygen, in the meanwhile, the corrosion product layer on the base metal was still loose, and therefore, the base metal was easy to be corroded.

Key words: underwater wet welding corrosion product corrosion rate microstructure polarization curve

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	Qiang BAI
	Yan ZOU
	Xiangfeng KONG
	Yang GAO
	Yan LIU
	Sheng DONG

Cite this article:

Qiang BAI,Yan ZOU,Xiangfeng KONG,Yang GAO,Yan LIU,Sheng DONG. Electrochemical Corrosion Behavior in Seawater of Weld Joints of CCSE40 Steel Prepared by Underwater WetWelding with Austenitic Welding Rod. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 427-432.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.206 OR https://www.jcscp.org/EN/Y2016/V36/I5/427

Table 1 Chemical compositions of base metal and weld zone of CCSE40 steel(mass fraction / %)

Fig.1 Surface morphologies of underwater wet welded joints after immersion in seawater for 28 weeks,before (a) and after (b) removal of corrosion products

Fig.2 SEM images of BM (a), HAZ (b) and WZ (c) of CCSE40 steel

Fig.3 Open circuit potentials of different zones of underwater wet welded joint in seawater as a function of immersion time

Fig.4 Polarization diagrams of BM, WZ and HAZ after immersion in seawater for 0.5 h (a), 8 weeks (b), 24 weeks (c) and 52 weeks (d)

Fig.5 Variations of R_p of HAZ and BM with immersiontime

Fig.6 Variations of B (a) and corrosion rate (b) of HAZ and BM with immersion time

Fig.7 XRD patterns of the corrosion products of HAZ (a) and BM (b) of underwater welded joint immersed in seawater for 28 weeks

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