Abstract
In this study, the influence of MnO substitution with CaO on the viscosity and structure of ternary SiO2–MnO–CaO submerged arc welding fluxes was investigated. The results showed that the viscosity increased with the substitution of MnO with CaO, which was correlated to the enhancement in the degree of polymerization of the flux structural units as the activation energy increased from 96.2 to 125.5 kJ/mol for viscous flow. Deconvolution and area integration of the Raman spectra of the fluxes revealed that the Q3/Q2 ratio (Qi, where i is the number of bridging oxygen in one [SiO4]-tetrahedral unit) increased and NBO/Si (nonbridging oxygen per silicon atom) decreased with higher CaO/(MnO + CaO) mass ratios. It was also observed from the O1s X-ray photoelectron spectroscopy (XPS) that the relative proportion of O0 and O2− increased at the cost of O−, indicating the polymerization of the fluxes, which correlated well with the Raman spectra results and the viscous behavior.
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Acknowledgments
The authors sincerely thank the National Natural Science Foundation of China (Grant Nos. 52104295, U20A20277, 51861145312, 52050410341, and 52011530180), Royal Academy of Engineering (Grant No. TSPC1070), and Research Fund for Central Universities (Grant No. N2025025). This work is also funded by the Regional Innovation Joint Fund of Liaoning Province (Grant No. 2020-YKLH-39).
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Manuscript submitted August 30, 2021, accepted November 11, 2021.
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Wang, C., Wang, Z. & Yang, J. Revealing the Viscosity–Structure Relationship of SiO2–MnO–CaO Fluxes Geared Toward High Heat Input Submerged Arc Welding. Metall Mater Trans B 53, 693–701 (2022). https://doi.org/10.1007/s11663-021-02391-4
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DOI: https://doi.org/10.1007/s11663-021-02391-4