Corrosion Performance of Different Zones for Weld Joint of A710 Steel in 3.5%NaCl Solution

doi:10.11902/1005.4537.2016.184

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (6): 611-616 DOI: 10.11902/1005.4537.2016.184

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Corrosion Performance of Different Zones for Weld Joint of A710 Steel in 3.5%NaCl Solution

Qian HU,Jing LIU(

),Yukun WANG,Feng HUANG,Mingjie DAI,Yanglai HOU

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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Abstract

The corrosion resistance for different zones of welded joint of A710 steel was investigated by electrochemical methods, mass loss measurement, morphological observation and component analysis. Results show that the three zones of the welded joint, namely base metal (BM), heat affected zone (HAZ) and weld seam (WS), exhibit different features in microstructure. BM consists mainly of ferrite, and HAZ consists mainly of ferrite, bainite and M-A islands, while WS consists mainly of bainite and less acicular ferrite. Among others the zone of WS shows the highest electrochemical activity and average corrosion rate in 3.5%NaCl solution. After 16 d immersion, the corrosion product on WS surface is loose and lack of protection, therefore, the deeper corrosion pits and grooves were observed on the WS zone. In contrast, the corrosion products on BM and HAZ surface are compact and have better protectiveness, consequently, the substrates of BM and HAZ suffered from slighter corrosion.

Key words: A710 steel microstructure ocean engineering corrosion product

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	Qian HU
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	Yukun WANG
	Feng HUANG
	Mingjie DAI
	Yanglai HOU

Cite this article:

Qian HU,Jing LIU,Yukun WANG,Feng HUANG,Mingjie DAI,Yanglai HOU. Corrosion Performance of Different Zones for Weld Joint of A710 Steel in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 611-616.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.184 OR https://www.jcscp.org/EN/Y2016/V36/I6/611

Fig.1 Macro morphology of A710 welded joint

Fig.2 Microstructures of three zones of weldedjoint: (a) BM, (b) WM, (c) HAZ

Fig.3 Open circuit potential of three zones of welded jointafter immersion for different time

Fig.4 Average corrosion rate of three zones of welded joint after immersion for different time

Fig.5 Micro morphologies of corrosion products of BM (a, d, g), WM (b, e, h) and HAZ (c, f, i) after immersion for 1 d (a~c), 8 d (d~f) and 16 d (g~i)

Table 1 Elements content in corrosion products of three zones of welded joint after immersion for 16 d (mass fraction / %)

Fig.6 Micro morphologies of substrates of BM (a, d, g), WM (b, e, h) and HAZ (c, f, i) after immersion for 1 d (a~c), 8 d (d~f) and 16 d (g~i)

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