含碳耐火材料的电化学侵蚀  

ELECTROCHEMICAL CORROSION OF CARBON-CONTAINING REFRACTORIES

作　　者：陈肇友[1] 张欣[1] 杨丁熬 李勇[1] 

机构地区：[1]冶金部洛阳耐火材料研究院

出　　处：《硅酸盐学报》1991年第5期442-447,共6页Journal of The Chinese Ceramic Society

摘　　要：为了说明碳或含碳耐火材料在熔渣-金属熔体交界处局部侵蚀的原因,测定了不同熔渣与碳及纯铁构成的高温电池:C|熔渣|Fe的电动势,其值在250至450mV。在这些高温电池中,碳电极皆为阳极(负极),Fe电极皆为阴极(正极)。发现当对此高温原电池外加一反电动势时,碳电极的侵蚀即被抑制。根据这些实验结果,认为含碳耐火材料在熔渣-金属交界处局部侵蚀的主要原因是由于电化学侵蚀机理造成的。文中还拟出了可能发生的电化学反应,并提出了抑制和减轻含碳耐火材料局部侵蚀的措施。The electrochemical examination on the corrosion of carbon or carbon-containing refractories at the molten slag-liquid metal interface has been carried out. The electromotive force (E.M.F.) of cells with different molten slags: C|Molten slag|Fe at elevated temperatures has been measured by means of potentiometer and it is in the range from 250 to 450 mV.It is found that the carbon electrode in these cells is anode and when an inverse E.M.F. is applied externally to the cell, the corrosion of carbon electrode will be suppressed entirely. Test results show that the local corrosion of carbon containing refractories at slag-metal interface is mainly caused by the mechanism of electrochemical corrosion.As the local corrosion of carbon-containing refractories at slag-metal interface is mainly caused by the mechanism of electrochemical corrosion, the following countermeasures can be used to prevent and reduce the corrosion: (1)adding some metal elements more active than carbon in electrode potential, such as Mg, Ca, Al or Si(sacrificial anode)to carbon-containing refractories; (2)connect the carbon-containing refractories directly to the D.C.negative pole; (3)adding some materials which are able to increase the electrical resistance to molten slag; (4) adding a refractory having poor conductivity such as BN to carbon-containing refractories to increase the electrical resistance of cell.

关 键 词：含碳耐火材料 电化学侵蚀 熔渣 

分 类 号：TQ175.714[化学工程—硅酸盐工业]