外电场作用下熔渣对MgO-C耐火材料的侵蚀行为<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.020.021

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (2727KB)
Export: BibTeX | EndNote (RIS)

Abstract The corrosion behavior of MgO-C refractories in molten slag was investigated under the applied voltage using MgO-C brick and molybdenum as the cathode and anode, respectively. The results show that the deposition potential of Si is about -6.1 V in the slag of CaO-SiO₂-Al₂O₃ system and -1.25 V of Fe, -5.85 V of Si in the CaO-SiO₂-Fe₂O₃ system, respectively. When the voltage is applied between the cathode and anode, ions, such as SiO₄^2- and Fe²⁺, move to the cathode and aggregate around the cathode. When the voltage applied is lower than the decomposition voltage of slag, the aggregated ions lead to an increase of viscosity of slag around the cathode, which decays the diffusion of slag toward the MgO-C refractories and then leads to a decrease of penetration depth. When the applied voltage is larger than the decomposition voltage of slag, liquid Si or Fe is produced in the role of applied voltage, which causes the shift of slag composition toward the high melting products (Ca₂SiO₄, MgAl₂O₄). The formation of high melting product layer is supposed to be a good physical and chemical protection for the refractory because they hinder the direct contact between the slag and the refractory. The type of electrodeposit products is closely related to slag compositions, for example, Ca₂SiO₄ formed in CaO-SiO₂-Al₂O₃ system and MgAl₂O₄ formed in CaO-SiO₂-Al₂O₃-MgO system.

Key words： applied voltage MgO-C refractories penetration depth electrodeposition

Published: 25 October 2017 Online: 2018-05-05

CLC number:	TF841.3
	TF748.2

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	WANG Huihua
	XU Yingjun
	JIANG Kun
	GE Bin
	QU Tianpeng
	WANG Deyong

Cite this article:

WANG Huihua,XU Yingjun,JIANG Kun, et al. Corrosion Behavior of MgO-C Refractory in Slag Under the Applied Voltage[J]. Materials Reports, 2017, 31(20): 96-100.

URL:

https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.020.021 OR https://www.mater-rep.com/EN/Y2017/V31/I20/96

1 Ruan G Z, Li N. Progress in research on reaction between MgO-C refractory and liquid steel [J]. Mater Rev, 2003,17(7):26(in Chinese).
阮国志,李楠. MgO-C耐火材料对钢水的增碳作用及机理的研究进展[J].材料导报,2003,17(7):26.
2 Chen Z Y. Trends in refractories for progress of iron and steel ma-king [J]. Refractories, 1994,28(6):309(in Chinese).
陈肇友. 钢铁工业用耐火材料的发展动向 [J]. 耐火材料, 1994,28(6):309.
3 Xu K D. Certain basic subjects on clean steel [J]. Acta Metall Sin, 2009,45(3):257(in Chinese).
徐匡迪. 关于洁净钢的若干基本问题 [J]. 金属学报,2009,45(3):257.
4 Liu L. Development and innovation of clean steel production techno-logy [J]. China Metall, 2016,26(10):18(in Chinese).
刘浏.洁净钢生长技术的发展与创新[J].中国冶金,2016,26(10):18.
5 Wang D Y, Li X B, Wang H H, et al. Dissolution rate and mechanism of solid MgO particles in synthetic ladle slags [J]. J Non-Cryst Solids, 2012,358:1196.
6 Kazakov A A. Influence of the electrical potential on converter smelting [J]. Russian Metall, 1997,6(1):25.
7 Shapiro B, Moon H, Garrell R L, et al. Equilibrium behavior of sessile drops under surface tension, applied external fields, and material variations [J]. J Appl Phys, 2003,93(9):5794.
8 Christos G, Michael H. Microstructured and electro-assisted high-temperature wettability of MgO in contact with a silicate slag-based on Fayalite [J]. Int J Appl Ceram Technol, 2008,5(5):469.
9 Liu Y N, Liang Y E, Sheng Y J, et al. Ultralow voltage irreversible electrowetting dynamics of anaqueousdrop on austainless steel surface[J]. Langmuir, 2015,31:2840.
10Nightingale S A, Brooks G A, Monaghan B J. Degradation of MgO refractory in CaO-SiO₂-MgO-FeO_xand CaO-SiO₂-Al₂O₃-MgO-FeO_x slags under forced convection [J]. Metall Mater Trans B, 2005,36(8):453.
11Monaghan B J, Nightingale S A. The dissolution behavior of select oxides in CaO-SiO₂-Al₂O₃ slags [C]∥ Ⅶ International conference on molten Slags and Salts. The South African Institute and Mining and Metallurgy, 2004.
12Monaghan B J, Nighingale S A, Dong Q. The effect of an applied voltage on the corrosion characteristics of dense MgO [J]. Enginee-ring, 2010,2:496.
13Sauerbrey R K, Mori G, Majcenovic C, et al. Corrosion protection of MgO electrodes at 1400℃ [J]. Corros Sci, 2009,51(1):1.
14Riaz S, Mills K C, Bain K. Experimental examination of slag/refractory interface [J]. Ironmaking Steelmaking, 2002,29(2):107.
15Riaz S. Effect of electric potential on mold powder behavior during solidification [J]. Ironmaking Steelmaking, 2012,39(6):409.
16Riaz S, Mills K C. Can the application of electric potential increase refractory life [J]. Ceram Forum Int, 2002,79(3):E47.
17Machin J S, Yee T B. Viscosity studies of system CaO-MgO-Al₂O₃-SiO₃:60 and 65% SiO₂ variation of viscosity when CaO, MgO, and/or Al₂O₃ are constant[J]. J Am Ceram Soc, 1954,37(4):177.