Abstract
The corrosion resistance of carbon steel weld metal with three different microstructures has been systematically evaluated using electrochemical techniques with the simulated produced water containing CO2 at 90 °C. Microstructures include acicular ferrite, polygonal ferrite, and a small amount of pearlite. With welding heat input increasing, weld metal microstructure becomes more uniform. Electrochemical techniques including potentiodynamic polarization curve, linear polarization resistance, and electrochemical impedance spectroscopy were utilized to characterize the corrosion properties on weld joint, indicating that the best corrosion resistance corresponded to the weld metal with a polygonal ferrite microstructure, whereas the weld metal with the acicular ferrite + polygonal ferrite microstructure showed the worst corrosion resistance. The samples with high welding heat input possessed better corrosion resistance. Results were discussed in terms of crystal plane orientation, grain size, and grain boundary type found in each weld metal by electron backscatter diffraction test.
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Acknowledgments
The authors are grateful to the Natural Science Foundation of Tianjin, China (13JCYBJC18200), and the authors also wish to express their thanks to the Offshore Oil Engineering Co., Ltd., China for providing the A106B steel weld joint samples.
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Lu, Y., Jing, H., Han, Y. et al. Effect of Welding Heat Input on the Corrosion Resistance of Carbon Steel Weld Metal. J. of Materi Eng and Perform 25, 565–576 (2016). https://doi.org/10.1007/s11665-015-1815-4
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DOI: https://doi.org/10.1007/s11665-015-1815-4