Effect of Nb on Corrosion Behavior of Simulated Weld HAZs of X80 Pipeline Steel in Simulated Seawater Environments Correxxxxsponding to Shallow Sea and Deep Sea

doi:10.11902/1005.4537.2016.177

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (6): 604-610 DOI: 10.11902/1005.4537.2016.177

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Effect of Nb on Corrosion Behavior of Simulated Weld HAZs of X80 Pipeline Steel in Simulated Seawater Environments Correxxxxsponding to Shallow Sea and Deep Sea

Zihao WANG,Yunhua HUANG(

),Jia LI,Lang YANG,Donghan XIE

Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The simulated intercritical HAZ (ICHAZ), fine grained HAZ (FGHAZ) and coarse grained HAZ (CGHAZ) of weld joints for two Nb containing steels were prepared by means of heat treatment. Then their microstructure and distribution of nano-sized precipitates were characterized by means of optical microscopy and transmission electron microscopy. Their corrosion behavior in simulated seawater environments corresponding to shallow sea and deep sea of 600 m below sea level respectively were studied by conventional electrochemical techiques and immersion tests. It's shown that the corrosion rate of ICHAZ and CGHAZ is much higher than that of FGHAZ. What's more, with the addition of Nb, the microstructural homogeneity of the steel is improved and the corrosion products films formed on the steels become much compact, thus enhancing their corrosion resistance. Besides, the nano-sized NbC precipitates can act as traps for capturing hydrogen, thus enhancing their corrosion resistance also in the seawater of deep sea.

Key words: HAZ shallow seawater deep seawater Nb corrosion behavior

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	Zihao WANG
	Yunhua HUANG
	Jia LI
	Lang YANG
	Donghan XIE

Cite this article:

Zihao WANG,Yunhua HUANG,Jia LI,Lang YANG,Donghan XIE. Effect of Nb on Corrosion Behavior of Simulated Weld HAZs of X80 Pipeline Steel in Simulated Seawater Environments Correxxxxsponding to Shallow Sea and Deep Sea. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 604-610.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.177 OR https://www.jcscp.org/EN/Y2016/V36/I6/604

Table 1 Chemical compositions of two base materials (mass fraction / %)

Fig.1 Microstructures of X80 pipeline steels with different Nb contents and corresponding simulated HAZs: (a) BM with Nb, (b) BM without Nb, (c) ICHAZ with Nb, (d) ICHAZ without Nb, (e) FGHAZ with Nb, (f) FGHAZ without Nb, (g) CGHAZ with Nb, (h) CGHAZ without Nb

Fig.2 TEM images of precipitates in X80 pipeline steels with (a) and without (b) Nb

Fig.3 Hardnesses of X80 pipeline steels and correspondingsimulated HAZs

Fig.4 Potential dynamic polarization curves of X80 steels with (a) and without (b) Nb and corresponding simulated HAZs in shallow seawater

Fig.5 Potential dynamic polarization curves of X80 steels with (a) and without (b) Nb and corresponding simulatedHAZs in deep seawater

Fig.6 Corrosion current densities of X80 steels and corresponding simulated HAZs in shaollow (a) and deep (b)seawaters

Fig.7 Corrosion morphologies of X80 steels and corresponding simulated HAZs immersed in shallow seawater for 50 d: (a) BM with Nb, (b) BM without Nb, (c) ICHAZ with Nb, (d) ICHAZ without Nb, (e) FGHAZ with Nb, (f) FGHAZwithout Nb, (g) CGHAZ with Nb, (h) CGHAZ without Nb

Fig.8 Surface morphologies of X80 steels and corresponding simulated HAZs after removing of corrosion products fromedduring immersion in shallow seawater for 50 d: (a) BM with Nb, (b) BM without Nb, (c) ICHAZ with Nb, (d) ICHAZ without Nb, (e) FGHAZ with Nb, (f) FGHAZ without Nb, (g) CGHAZ with Nb, (h) CGHAZ without Nb

Fig.9 Corrosion rates of X80 steels and correspondingsimulated HAZs

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