论文部分内容阅读
通过采用扫描电镜(SEM)、辉光放电光谱(GDS)等分析方法对HC420LAD+ZF合金化镀锌板表面山水画缺陷进行分析。结果表明,HC420LAD+ZF合金化镀锌板在热轧粗轧过程中其表面形成大量含Si氧化物,粗轧工序第1,3,5道次除鳞及冷轧酸洗工序都不能有效去除该氧化物。镀锌合金化过程中残留在基板表面的含Si氧化物阻止了Fe-Zn相互扩散,形成疏松合金层,最终表现为表面山水画缺陷。热轧过程采用全道次除鳞能有效去除含Si,Mn氧化物,镀锌后获得均匀致密合金化组织,消除了HC420LAD+ZF合金化镀锌板表面山水画缺陷。
The defects of landscape painting on HC420LAD + ZF galvanized sheet were analyzed by scanning electron microscopy (SEM) and glow discharge spectroscopy (GDS). The results show that HC420LAD + ZF alloyed galvanized sheet can form a large amount of Si-containing oxides on the surface during the hot rolling and rough rolling, and the first, the third and the fifth descaling steps and the cold pickling process of the rough rolling process can not be effectively removed This oxide. During the galvannealing process, Si-containing oxides remaining on the surface of the substrate prevent the inter-diffusion of Fe-Zn to form a loose alloy layer, which ultimately manifests as a surface painting defect. In the hot rolling process, full scale descaling can effectively remove oxides containing Si and Mn, and uniform and uniform alloying structure can be obtained after galvanizing, thereby eliminating the defects of landscape painting on the surface of HC420LAD + ZF alloyed galvanized sheet.