扫描电镜在热轧板表面氧化铁皮分析中的应用

用扫描电镜(SEM)及能谱分析(EDS)、X射线衍射(XRD)等方法对精轧前采用及未采用除鳞系统(FSB)的两种工艺下的热轧板表面的氧化铁皮作了对比分析。结果表明，两种工艺下的热轧板表面氧化铁皮结构均由三种铁的氧化物FeO、Fe3O4和Fe2O3构成；在靠近基板到表层的氧化铁皮中三种铁的氧化物按FeO，Fe3O4和Fe2O3顺序逐渐增多，且内层的结构成分以氧化亚铁为主。FeO含量较少的氧化铁皮层与钢板基体结合比较疏松，容易去除。精轧前采用FSB除鳞系统工艺并不能显著缓解热轧板表面的氧化铁皮缺陷问题，通过对热轧生产工艺的优化调整可解决热轧氧化铁皮去除难的问题。

THE APPLICATION OF SCANNING ELECTRON MICROSCOPE IN THE ANALYSIS ON IRON OXIDE SCALE ON THE SURFACE OF HOT ROLLED STEEL PLATE

The comparison of the iron oxide scales on the surface of the hot rolled steel plate under the two dephosphorising processes standard, namely, either applying FSB dephosphorising system before fine rolled or not has been made. The results show that the iron oxide scales on the surface of the hot rolled steel plate are comprised of three types of iron oxides, named FeO, Fe 3O 4 and Fe 2O 3 in both processes; in the area from the base plate to the surface, FeO, Fe 3O 4 and Fe 2O 3 are ascent ordered by the quantity in the iron oxide scales, while the inner portion is mainly comprised of FeO. The iron oxide layer with lower fraction of FeO is loosely bonded with steel base plate, which makes it easy to remove. Applying FSB dephosphorising system process before fine rolling does not improve the surface quality of iron oxide scale evidently. The problem of removing the hot rolled iron oxide scales could be solved by optimizing the manufacture process during the hot rolling.