Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel

Wang, Jianbao; Xiao, Guangchun; Zhao, Wei; Zhang, Bingrong; Rao, Wei-Feng

doi:10.3390/met9121325

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…In steel, an increased level of corrosive-aggressive non-metallic inclusions can intensify local corrosion processes in the base metal and HAZ. Nanoscale corrosive-aggressive non-metallic inclusions and complex precipitates consisting of oxide and carbonitride components can further decrease the corrosion resistance of the metal in the HAZ [28]. The corrosion behavior in the heat-affected zone (HAZ) was quite different from that in the weld metal (WM) and base metal (BM).…”

Section: Discussionmentioning

confidence: 99%

Corrosion Performance of Welded Joints for E40 Marine Steel

Li,

Wu,

Sun

2023

Metals

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Marine steel requires excellent toughness and corrosion resistance in a low-temperature seawater environment. In this study, corrosion tests on E40 steel were performed, including electrochemical testing of the weld metal and heat-affected zone, dynamic corrosion testing in a simulated seawater environment, and the analysis and comparison of results obtained using different methods. The corrosion resistance of E40 was determined by measuring the saturation current density of the anodic dissolution of the steel in a corrosive medium by an electrochemical method. Under laboratory conditions, the corrosion resistance was investigated under simulated seawater. The results showed that regions with uneven microhardness corresponded to the inhomogeneity of the corrosion potential, with measured fluctuations of up to 40 mV. Nanoscale corrosive–aggressive non-metallic inclusions served as a substrate for the deposition of titanium and niobium carbonitrides, thereby weakening the corrosion resistance. The corrosion rate of the base metal was 1.16–1.64 mm/year, which was slightly higher than that of the heat-affected zone. The influence of deposition on the corrosion performance of welded joints under different deoxygenation processes was studied, and the deposition composition was controlled by a deoxygenation process to improve the corrosion resistance of the steel plate.

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Section: Discussionmentioning

confidence: 99%

Corrosion Performance of Welded Joints for E40 Marine Steel

Li,

Wu,

Sun

2023

Metals

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“…Since the presence of hydrogen is difficult to detect, the enrichment of S in the vicinity of the crack (Figure 12) reflects that hydrogen atoms do play a role in the propagation of the cracks, which was supposed to induce the occurrence of HE and lead to a reduction in the fracture toughness of the welded joint in the H 2 S-containing environment. Wang et al [25] investigated the corrosion resistance of X80 pipeline steel submerged arc-welded joints to H 2 S in terms of electrochemical corrosion tests and the results showed that the FGHAZ dominated by PF had the best H 2 S corrosion resistance, followed by the WM composed of fine AF, while the CGHAZ consisted of GF and some M-A constituents had the worst H 2 S corrosion resistance. Moreover, it was reported that the bainite in the CGHAZ had the lowest open-circuit potential and it was most susceptible to being corroded during the H 2 S electrochemical corrosion process [25].…”

Section: Fracture Toughness Deterioration Of the Joint In H 2 S Conta...mentioning

confidence: 99%

“…Wang et al [25] investigated the corrosion resistance of X80 pipeline steel submerged arc-welded joints to H 2 S in terms of electrochemical corrosion tests and the results showed that the FGHAZ dominated by PF had the best H 2 S corrosion resistance, followed by the WM composed of fine AF, while the CGHAZ consisted of GF and some M-A constituents had the worst H 2 S corrosion resistance. Moreover, it was reported that the bainite in the CGHAZ had the lowest open-circuit potential and it was most susceptible to being corroded during the H 2 S electrochemical corrosion process [25]. The occurrence of GB and LB was thought to cause CGHAZ to exhibit the weakest resistance to H 2 S corrosion.…”

Section: Fracture Toughness Deterioration Of the Joint In H 2 S Conta...mentioning

confidence: 99%

Effect of H2S Corrosion on the Fracture Toughness of the X80 Pipeline Steel Welded Joint

Wang

Deng

et al. 2022

Materials

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To analyze the causes and mechanisms affecting the fracture toughness of X80 pipeline steel welded joints against H2S, the fracture toughness of different zones of X80 pipeline steel welded joints in both air and saturated H2S solution was investigated. The fracture toughness of welded joints degraded significantly in the saturated H2S solution, where the crack tip opening displacement (CTOD) characteristic value in the coarse grain heat-affected zone (CGHAZ) and weld metal (WM) was only 8% and 12% of that in air, respectively. However, the sub-critical grain heat-affected zone (SCHAZ) showed better resistance to H2S corrosion, with the CTOD characteristic value reaching 42% of that in air. The resistance of the welded joint to H2S corrosion was sensitive to microstructures. The grain boundary ferrite (GBF) presented in WM, and the angle of grain boundary orientation in CGHAZ was not conducive to hindering crack propagation. Moreover, the formation of the resultant hydrogen cracks owing to the H2S corrosion also reduced the fracture toughness of the welded joint.

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“…The free potential of the HAZ is close to the coupling potential, so there is almost no galvanic interaction. Jian-bao Wang et al (Wang et al, 2019). studied the hydrogen sulfide corrosion resistance of X80 pipeline steel welded joint.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Corrosion Behavior of TA2 Titanium Alloy Welded Joints in Seawater Environment

Zhang

Liu

et al. 2022

Front. Chem.

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Titanium alloy has been widely used in Marine pipeline system because of its excellent corrosion resistance. However, there are differences in microstructure and electrochemical properties because of the heterogeneous structure of the welded joint, the corrosion behavior is often different. In this paper, the corrosion behavior of TA2 titanium alloy welded joint in seawater at different temperatures was studied by traditional macro electrochemical test analysis combined with microelectrode array test and surface morphology analysis. Conventional macroscopic electrochemical analysis results show that the corrosion resistance of heat-affected zone is always the best, followed by the base metal and the weld. And the higher the temperature, the easier the formation of passivation film. The results of microelectrode array test show that the heat-affected zone is always the cathode region of the whole welded joint, and part of the cathode near the base metal region has the largest current density, which acts as the main cathode to slow down corrosion. At slightly higher temperatures, the polarity deflection will occur in the base metal zone and weld zone due to the different formation speeds of passivation film in early corrosion stage. With the prolongation of corrosion time, the base metal eventually becomes the cathode zone and the weld zone eventually becomes the anode zone.

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Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel

Cited by 12 publications

References 35 publications

Corrosion Performance of Welded Joints for E40 Marine Steel

Corrosion Performance of Welded Joints for E40 Marine Steel

Effect of H2S Corrosion on the Fracture Toughness of the X80 Pipeline Steel Welded Joint

Characterization of Corrosion Behavior of TA2 Titanium Alloy Welded Joints in Seawater Environment

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