Corrosion Behavior of Weld Joint of S450EW Steel in NaHSO3 Solution

doi:10.11902/1005.4537.2016.178

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (6): 575-582 DOI: 10.11902/1005.4537.2016.178

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Corrosion Behavior of Weld Joint of S450EW Steel in NaHSO₃ Solution

Jun WANG¹, Chao FENG^1,², Bicao PENG^1,², Yi XIE^1,², Minghua ZHANG³, Tangqing WU³(

)

1 State Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China
2 Hunan Xiangdian Boiler & Pressure Vessel Test Center Ltd., Changsha 410007, China;
3 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China

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Abstract

The weld joint of S450EW steel was prepared by metal active gas arc (MAG) welding. The corrosion behavior of different zones of the welded joint was studied via electrochemical test and scanning electron microscope (SEM). The results showed that the microstructures were mainly composed of granular bainite of the base metal zone and weld zone, while the microstructure of the heat affected zone was composed of a mixture of ferrite and pearlite. Uniform corrosion was the typical corrosion pattern in the weld zone, and local corrosion occurred in the base metal zone and heat affected zone. Besides, severer local corrosion was observed in the heat affected zone. The better corrosion resistance of the weld zone may ascribed to the effect of high Ni content of the welding rod, while the high corrosion rate of the heat affected zone may be due to the dual phase microstructure of ferrite and pearlite.

Key words: S450EW steel welded joint atmospheric corrosion electrochemical impedance spectroscopy

Received: 19 September 2016

ZTFLH:

TG172.4

Fund: Supported by National Natural Science Foundation of China (51601164 and 51471176) and China Postdoctoral Science Foundation (2017M622594)

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Cite this article:

Jun WANG, Chao FENG, Bicao PENG, Yi XIE, Minghua ZHANG, Tangqing WU. Corrosion Behavior of Weld Joint of S450EW Steel in NaHSO₃ Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(6): 575-582.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.178 OR https://www.jcscp.org/EN/Y2017/V37/I6/575

Table 1 Chemical compositions of S450EW steel and TH650EW-II welding wire(mass fraction / %)

Fig.1 Welding sequence of the weld joint

Fig.2 Metallographs of the S450EW weld joint: (a, b) base metal, (c, d) heat affected zone, (e, f) weld metal

Fig.3 Surface morphology of the base metal zone after corrosion (a) and the magnified image of area I in Fig.3a (b)

Fig.4 Surface morphology of the heat affected zone after corrosion (a) and the magnified image of area II in Fig.4a (b)

Fig.5 Surface morphology of the weld zone after corrosion (a) and the magnified image of area III in Fig.5a (b)

Fig.6 General (a) and high-magnified (b) views of the surface of the base metal zone after removal of the corrosion product

Fig.7 General (a) and high-magnified (b) views of the surface of the heat affected zone after removal of the corrosion product

Fig.8 General (a) and high-magnified (b) views of the surface of the base metal zone after removal of the corrosion product

Fig.9 Open circuit potentials of different zones in the weld joint as a function of time

Fig.10 Linear polarization resistances of different zones in the weld joint as a function of time

Fig.11 Tafel plots of the different zone in the weld joint after immersion in 0.01 mol/L NaHSO₃ solution for 12 d

Table 2 Fitting results of Tafel polarization curves of different zones in the weld joint

Fig.12 Nyquist plots of the different zone after immersion in 0.01 mol/L NaHSO₃ solution for 6 h (a), 1 d (b), 4 d (c) and 12 d (d)

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