Zhao Lei, Yang Jichun, Fu Xiaoyang
School of Rare Earth Industry (School of Rare Earth Engineering and Technology), Inner Mongolia University of Science and Technology, Baotou 014010, China.
Key Laboratory of Green Extraction and Application of Light Rare Earth Resources of the Ministry of Education, Inner Mongolia University of Science and Technology, Baotou 014010, China.
Materials (Basel). 2024 Dec 27;18(1):69. doi: 10.3390/ma18010069.
The changes in the inclusions in 316L stainless steel before and after Ce addition were studied by adding different contents of Ce. The effects of rare earth Ce treatment on the modification of MnS inclusions in steel and the pitting corrosion resistance of 316L stainless steel are studied by field-emission scanning electron microscopy, laser confocal microscopy, the 6% FeCl corrosion weight loss test, and Tafel polarization curve test. The results show that the addition of Ce reduces the corrosion rate of stainless steel in 6% FeCl solution, and reduces the number and size of corrosion pits. The corrosion resistance is the best at a 0.0082% Ce content. In addition, the addition of Ce reduced the corrosion current density of stainless steel in 3.5% NaCl solution and increased the corrosion potential. The corrosion potential increased from -329 mV to -31.4 mV. Through Ce treatment, the grain is refined and the inclusions in the experimental steel are modified. With the increase in rare earth content, Mn S gradually transforms into CeO S inclusions. The morphology of the inclusions gradually change from the original long strips to a spherical shape, and the average size is significantly reduced, which improves the corrosion resistance of the stainless steel. The addition of rare earth Ce plays modifies the inclusions and purifies molten steel.
通过添加不同含量的铈（Ce），研究了316L不锈钢添加Ce前后夹杂物的变化。采用场发射扫描电子显微镜、激光共聚焦显微镜、6%FeCl腐蚀失重试验和塔菲尔极化曲线试验，研究了稀土Ce处理对钢中MnS夹杂物的变质作用及316L不锈钢耐点蚀性能的影响。结果表明，添加Ce降低了不锈钢在6%FeCl溶液中的腐蚀速率，减少了腐蚀坑的数量和尺寸。当Ce含量为0.0082%时，耐蚀性最佳。此外，添加Ce降低了不锈钢在3.5%NaCl溶液中的腐蚀电流密度，提高了腐蚀电位。腐蚀电位从-329mV提高到-31.4mV。通过Ce处理，细化了晶粒，变质了试验钢中的夹杂物。随着稀土含量的增加，MnS逐渐转变为CeO S夹杂物。夹杂物的形态逐渐由原来的长条状变为球形，平均尺寸显著减小，提高了不锈钢的耐蚀性。添加稀土Ce起到了变质夹杂物和净化钢液的作用。
