【作者】 侯延辉； 刘林利； 李光强； 李腾飞； 刘昱；

【Author】 Hou Yanhui;Liu Linli;Li Guangqiang;Li Tengfei;Liu Yu;State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology;

【机构】 耐火材料与冶金省部共建国家重点实验室武汉科技大学； 钢铁冶金及资源利用省部共建教育部重点实验室武汉科技大学；

【摘要】 为了揭示高强度管线钢中典型复合夹杂物诱发点蚀的机理,本文以Al-Ti-Mg脱氧钢为例,采用第一性原理计算,浸泡试验,扫描电镜等研究了钢中复合夹杂物/钢基体的电势差与电偶腐蚀的关系。结果表明,在3.5%NaCl腐蚀环境中,Mn S夹杂物起阳极作用,优先腐蚀和溶解;MgAl₂O₄和Al₂O₃起阴极作用,导致铁基体的腐蚀;MgTiO₃和MgTi₂O₄的不同端面同时起阳极和阴极的作用,因此对点蚀的影响不明显。更多还原

【Abstract】 In order to reveal the mechanism of galvanic pitting corrosion initiation induced by typical composite inclusions, first-principles calculations, combining with immersion tests, scanning electron microscopy was used to study the correlation between electronic work function and galvanic corrosion of Al-Ti-Mg killed steel. The results show that MnS inclusions act as anodes in the electrochemical environment, preferentially corroding and dissolving; MgAl₂O₄ and Al₂O₃ inclusions act as cathodes, leading to the corrosion of Fe matrix; different end planes of MgTiO₃ and MgTi₂O₄ act as both anodes and cathodes, so they have little effect on pitting corrosion.更多还原