Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel
Abstract
:1. Introduction
2. Experimental Procedures
2.1. Materials
2.2. Microstructure and Micro-Morphologies of Corrosion Product Observations
2.3. Electrochemical Experiments
3. Results and Discussion
3.1. Microstructure Evolution
3.2. Corrosion Resistance Analysis in H2S Environments
3.2.1. Open Circuit Potential (OCP)
3.2.2. Electrochemical Impedance Spectroscopy (EIS)
3.2.3. Characterization of the Corrosion Product Films
3.2.4. Analysis of the Differences in Corrosion Resistance for Different Zones
4. Conclusions
- (1)
- In the X80 pipeline steel submerged arc welded joint, the microstructure of BM, WM, CGHAZ, and FGHAZ was mainly PF + GB, AF, GB, PF + M/A constituents with fine grains, respectively.
- (2)
- The WM showed the highest hardness, and the HAZ near the BM showed the lowest hardness in the welded joint.
- (3)
- The CGHAZ showed the lowest open circuit potential, indicating that it would be attacked preferentially when the welded joint is immersed in the electrolyte as a whole.
- (4)
- In the H2S environments, the order of corrosion resistance of X80 pipeline steel submerged arc welded joints was FGHAZ > BM> WM > CGHAZ. The CGHAZ was the weak zone of corrosion resistance of the welded joint.
- (5)
- The composition and structure of the corrosion products were not affected by the difference of composition and crystal structure of the welded joint. But the micromorphology was quite different, which was the reason for the difference of corrosion resistance.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Material | C | Si | Mn | Al | V | Ni | Cr | Mo | Ti | Cu | Nb |
---|---|---|---|---|---|---|---|---|---|---|---|
BM | 0.046 | 0.305 | 1.760 | 0.058 | 0.008 | 0.225 | 0.023 | 0.226 | 0.015 | 0.215 | 0.079 |
WM | 0.062 | 0.380 | 1.830 | 0.030 | 0.004 | 0.190 | 0.204 | 0.090 | 0.013 | 0.200 | 0.040 |
Material | BM | WM | CGHAZ | FGHAZ |
---|---|---|---|---|
Fe (at %) | 44.82 (1.21) | 46.83 (1.26) | 45.12 (1.15) | 45.83 (1.28) |
S (at %) | 55.18 (1.21) | 53.17 (1.26) | 54.88 (1.15) | 54.17 (1.28) |
Fe/S | 1.23 (0.11) | 1.14 (0.13) | 1.22 (0.09) | 1.18 (0.15) |
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Wang, J.-B.; Xiao, G.-C.; Zhao, W.; Zhang, B.-R.; Rao, W.-F. Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel. Metals 2019, 9, 1325. https://doi.org/10.3390/met9121325
Wang J-B, Xiao G-C, Zhao W, Zhang B-R, Rao W-F. Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel. Metals. 2019; 9(12):1325. https://doi.org/10.3390/met9121325
Chicago/Turabian StyleWang, Jian-Bao, Guang-Chun Xiao, Wei Zhao, Bing-Rong Zhang, and Wei-Feng Rao. 2019. "Microstructure and Corrosion Resistance to H2S in the Welded Joints of X80 Pipeline Steel" Metals 9, no. 12: 1325. https://doi.org/10.3390/met9121325