510L氧化层物相组成、结构与耐蚀性关系的研究

Study of relationship between composition,structure of surface oxidation and corrosion resistance of 510L

采用热处理方法获得不同物相组成和组织结构的510L大梁钢氧化层,利用电化学工作站和扫描电镜对样品的耐蚀性进行评估并观察样品氧化层截面处的组织结构,探究了510L氧化层物相组成、结构与耐蚀性的关系。结果表明,当氧化层满足物相中Fe2O3质量分数为13%-24%,Fe3O4质量分数为75%~85%,FeO质量分数小于2%时,FeO的存在状态为非块状残留,均匀弥散分布,氧化铁皮完整、致密,耐蚀性能最好。根据该研究结果进行现场轧制工艺参数调整并完成试制,试制结果进一步佐证了本试验结论。

The oxidation layer of 510 Lbeam steel with different phase composition ratio and structure form obtained by the heat treatment was studied.The corrosion resistance of the sample was evaluated by electrochemical workstation and scanning electron microscopy method to observe the microstructure of the layer cross section.The experiment results showed that the layer would get the best corrosion resistance when Fe2 O3 mass percent was 13%~24%,Fe3 O4 mass percent was 75%~85%and FeO mass percent was below 2%.Meanwhile,the FeO was non block residual and evenly dispersed,and the oxide scales were intact and densely.According to the conclusion,the process adjustment was completed and trial production was carried out.The results of the trial production supported the results further.