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

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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: 05 May 2018

CLC number:	TF841.3
	TF748.2

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	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.

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

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