材料期刊网

目的：分析冷轧带钢表面氧化色缺陷的成分,分析氧化色形成的原因,研究减少氧化色的方法途径。方法通过实验室模拟现场退火实验,研究不同材料在不同出炉温度下对带钢表面氧化色的影响；采用X射线光电子能谱、场发射扫描电镜,对不同方式产生的氧化色进行微观形貌观察和元素分析；使用X射线衍射仪对氧化色进行物相分析。结果出炉温度是影响带钢退火后形成黄色氧化色的主要条件。实验室退火实验与生产现场生成的氧化色相同,氧化膜为黄色,由O,Mn,Fe,C等4种元素组成,主要是铁和锰的氧化物,膜层的厚度较薄约为50 nm,局部表面存在明显的Mn元素富集。结论带钢表面氧化色缺陷由氧化物组成,具有氧化色缺陷敏感性的冷轧带钢在罩式炉退火中,局部表面产生了易氧化元素Mn的富集；当出炉温度较高时,Mn元素优先被氧化形成了与正常板面不同的氧化色缺陷,氧化色的耐蚀性低于正常板面。降低出炉温度可有效减少氧化色的形成。

ABSTRACT:Objective To analyze the composition of the oxidation color defects on the surface of cold rolled steel strip, and study the causes for the formation of oxidation color, then find the way to reduce oxidation color. Methods By simulating the an-nealing experiment in laboratory, we studied the influence of different materials at different tapping temperature on the oxidation color on the surface of cold rolled steel strip. By using Photoelectron Spectroscopy and field emission scanning electron microscopy, we analyzed the microstructure and elementary composition of the oxidation color produced in different ways. By using X-ray dif-fractometer, we conducted phase analysis for oxidation color. Results The results showed that the tapping temperature was the main factor for producing yellow oxidation color after strip annealing. The yellow oxide produced in the simulated annealing experiment was the same with that in the production field. The yellow oxide film was composed of four elements: O, Mn, Fe, C. The main compositions were iron and manganese oxides. The film was thin, and the thickness was about 50 nm. There was obvious enrich-ment of manganese element on some local surface. Conclusion The oxide formed oxidation color on the surface of cold rolled strip. In the process of annealing, manganese element enriched in sensitive position. When the tapping temperature was high, the Mn el-ement was oxidized with priority and formed the oxidation color defect which had different color from that of the normal board. The corrosion resistance of oxidation color was lower than that of the normal board. Decreasing the tapping temperature could effectively reduce the formation of oxidation color.