Formation of a dense layer on corroded interface to suppress corrosion is always desired, but it is controlled by numerous environmental conditions. In this work, corroded microstructures of MgO/Al₂O₃‐SiC‐C refractories in metal bath area of ladle furnace were investigated after industrial trails. A liquid‐phase isolation layer in which MgO islands and liquid phases was established on the corroded interface of refractories with 6 wt% coarse/fine SiC‐additive. The formed isolation layer against steel/slag attacks led to an approximate 30% improvement in corrosion resistance than that of refractory with 3 wt% fine SiC‐additive. More importantly, the liquid‐phase isolation layer blocked the direct mass transfer between molten steel and refractories while it decreased exogenous pollution from refractories. SiC‐additive affected the formation process of isolation layer by controlling the generation/migration of Mg(g) on refractory' surface. A further formation mechanism of liquid‐phase isolation layer was discussed in detail and role of SiC was elucidated.

中文翻译：

---

MgO / Al2O3-SiC-C耐火材料与钢水腐蚀界面上液相隔离层的形成：SiC的作用

一直希望在腐蚀的界面上形成致密层以抑制腐蚀，但这受许多环境条件的控制。在这项工作中，腐蚀的MgO / Al ₂ O _3的微观结构经过工业试验后，对钢包炉金属熔池区域的SiC-C耐火材料进行了研究。在含6 wt％粗/细SiC添加剂的耐火材料的腐蚀界面上建立了一个液相隔离层，其中有MgO岛和液相。形成的抗钢/渣侵蚀隔离层使耐腐蚀性能比含3 wt％细SiC添加剂的耐火材料提高了约30％。更重要的是，液相隔离层阻止了钢水和耐火材料之间的直接传质，同时减少了耐火材料的外源污染。SiC添加剂通过控制耐火材料表面Mg（g）的产生/迁移来影响隔离层的形成过程。